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    <link:loc xlink:href="bxc-20161231.xsd#bxc_DomesticEquitySecuritiesMember" xlink:label="loc_bxc_DomesticEquitySecuritiesMember_0B11B2016CBB68211B3070941D7F8D4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_DomesticEquitySecuritiesMember_0B11B2016CBB68211B3070941D7F8D4F" xlink:to="lab_bxc_DomesticEquitySecuritiesMember_0B11B2016CBB68211B3070941D7F8D4F" xlink:type="arc" />
    <link:label id="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF_verboseLabel_en-US" xlink:label="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Equity securities &#8212; international</link:label>
    <link:label id="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF_label_en-US" xlink:label="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">International Equity Securities [Member]</link:label>
    <link:label id="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF_documentation_en-US" xlink:label="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents investment that pools funds from investors to invest in a combination of underlying investments, primarily fixed income investments.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_InternationalEquitySecuritiesMember" xlink:label="loc_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:to="lab_bxc_InternationalEquitySecuritiesMember_B87A1D4F0C8BF3AB9D5670941D7F58FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D_verboseLabel_en-US" xlink:label="lab_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fixed income</link:label>
    <link:label id="lab_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D_label_en-US" xlink:label="lab_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fixed Income Funds [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FixedIncomeFundsMember" xlink:label="loc_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D" xlink:to="lab_us-gaap_FixedIncomeFundsMember_F7A209E2A17D922E66D970941D7F9B9D" xlink:type="arc" />
    <link:label id="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66_verboseLabel_en-US" xlink:label="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66_label_en-US" xlink:label="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Investment [Member]</link:label>
    <link:label id="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66_documentation_en-US" xlink:label="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents investment that pools funds from investors to invest in a combination of underlying investments, primarily other than debt securities, equity securities, and real estate to total plan assets.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_OtherInvestmentMember" xlink:label="loc_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:to="lab_bxc_OtherInvestmentMember_46E589A31F5BEE8C1FB570941D7FAF66" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_870D6A36799BAED91C2470941D7F3316_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_870D6A36799BAED91C2470941D7F3316" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Asset allocation structure of the portfolio</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_870D6A36799BAED91C2470941D7F3316" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_870D6A36799BAED91C2470941D7F3316" xlink:to="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_870D6A36799BAED91C2470941D7F3316" xlink:type="arc" />
    <link:label id="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164_verboseLabel_en-US" xlink:label="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Asset allocation structure of the portfolio</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164_label_en-US" xlink:label="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan Normal Asset Allocations</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164_documentation_en-US" xlink:label="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Normal allocation of investments of this type to total plan assets presented on a weighted average basis.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_DefinedBenefitPlanNormalAssetAllocations" xlink:label="loc_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:to="lab_bxc_DefinedBenefitPlanNormalAssetAllocations_02B8DC2FA5F29B69616D70941D7F3164" xlink:type="arc" />
    <link:label id="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061_verboseLabel_en-US" xlink:label="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Compound annualized risk free rate</link:label>
    <link:label id="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061_label_en-US" xlink:label="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compound Annualized Risk Free Rate</link:label>
    <link:label id="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061_documentation_en-US" xlink:label="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents compound annualized risk free rate.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CompoundAnnualizedRiskFreeRate" xlink:label="loc_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:to="lab_bxc_CompoundAnnualizedRiskFreeRate_0E2902556ECB561D300970941D7F7061" xlink:type="arc" />
    <link:label id="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC_verboseLabel_en-US" xlink:label="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected overall portfolio return percentage</link:label>
    <link:label id="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC_label_en-US" xlink:label="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expected Overall Portfolio Return, Percentage</link:label>
    <link:label id="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC_documentation_en-US" xlink:label="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents expected overall portfolio return, percentage.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ExpectedOverallPortfolioReturnPercentage" xlink:label="loc_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:to="lab_bxc_ExpectedOverallPortfolioReturnPercentage_A8B2F0EEE9FB7DB2466870941D7F80DC" xlink:type="arc" />
    <link:label id="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA_verboseLabel_en-US" xlink:label="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of estimated expense</link:label>
    <link:label id="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA_label_en-US" xlink:label="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expense Estimate, Percentage</link:label>
    <link:label id="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA_documentation_en-US" xlink:label="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents percentage of estimated expense.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ExpenseEstimatePercentage" xlink:label="loc_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:to="lab_bxc_ExpenseEstimatePercentage_E320B74854422EFAB3FE70941D7F2DBA" xlink:type="arc" />
    <link:label id="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B_verboseLabel_en-US" xlink:label="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net long term rate of return</link:label>
    <link:label id="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B_label_en-US" xlink:label="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Long Term Rate Of Return</link:label>
    <link:label id="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B_documentation_en-US" xlink:label="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net long term rate of return.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_NetLongTermRateOfReturn" xlink:label="loc_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:to="lab_bxc_NetLongTermRateOfReturn_311C3E0632C820DD097A70941D7F2D5B" xlink:type="arc" />
    <link:label id="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4_verboseLabel_en-US" xlink:label="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Target allocations for fiscal 2016</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4_label_en-US" xlink:label="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan Estimated Target Plan Asset Allocations</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4_documentation_en-US" xlink:label="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the estimated target allocation of investments of this type to total plan assets presented on a weighted average basis.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations" xlink:label="loc_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:to="lab_bxc_DefinedBenefitPlanEstimatedTargetPlanAssetAllocations_7A73F1B4025E5002F16D70941D7F1DC4" xlink:type="arc" />
    <link:label id="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881_verboseLabel_en-US" xlink:label="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of minimum quarterly cash contributions during fiscal 2016 and 2017</link:label>
    <link:label id="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881_label_en-US" xlink:label="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Minimum Required Quarterly Cash Contributions During Fiscal</link:label>
    <link:label id="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881_documentation_en-US" xlink:label="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents number of minimum quarterly cash contributions during the fiscal year.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal" xlink:label="loc_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:to="lab_bxc_NumberOfMinimumRequiredQuarterlyCashContributionsDuringFiscal_D29B1D507371AABABBBA70941D7F4881" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2016</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182" xlink:to="lab_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_4AFA14B643CB0E1D508C70941D7F0182" xlink:type="arc" />
    <link:label id="lab_bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions_C5D706366C1E5C4D731E70941D7F4F4A_terseLabel_en-US" xlink:label="lab_bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions_C5D706366C1E5C4D731E70941D7F4F4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentages of employees represented by various labor unions</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_F78C7281B5531B5960676E3B64B189C0_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_F78C7281B5531B5960676E3B64B189C0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of provision for income taxes</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4DD078F949C57AF09D996E3B64B18588_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4DD078F949C57AF09D996E3B64B18588" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of provision for income taxes is reconciled to the federal statutory</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_AA634735294FF77562297243466711AF_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_AA634735294FF77562297243466711AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_AA634735294FF77562297243466711AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_AA634735294FF77562297243466711AF" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_AA634735294FF77562297243466711AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Issuance of restricted stock, net of forfeitures</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_66972A974829E844D44572434667FE39" xlink:type="arc" />
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF_verboseLabel_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Vesting of performance shares (in shares)</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF_label_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period Shares Performance Shares</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF_documentation_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents number of shares issued in relation to performance shares during the period.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_StockIssuedDuringPeriodSharesPerformanceShares" xlink:label="loc_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:to="lab_bxc_StockIssuedDuringPeriodSharesPerformanceShares_B327B8061F321745DA517243466774CF" xlink:type="arc" />
    <link:label id="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279_verboseLabel_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Vesting of performance shares</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279_label_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period Value Performance Shares</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279_documentation_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents value of stock related to performance shares issued during the period.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_StockIssuedDuringPeriodValuePerformanceShares" xlink:label="loc_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:to="lab_bxc_StockIssuedDuringPeriodValuePerformanceShares_27C54630A0FD9FCF6B8572434667C279" xlink:type="arc" />
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D_verboseLabel_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Compensation related to share-based grants (in shares)</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D_label_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period Shares New Issues Pursuant To Right Offerings</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D_documentation_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Issuance of stock related to the rights offering, net of expenses, shares</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings" xlink:label="loc_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:to="lab_bxc_StockIssuedDuringPeriodSharesNewIssuesPursuantToRightOfferings_946F03687A67424756E7724346677E8D" xlink:type="arc" />
    <link:label id="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7_verboseLabel_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Compensation related to share-based grants</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7_label_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period Value New Issues Pursuant To Right Offerings</link:label>
    <link:label id="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7_documentation_en-US" xlink:label="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents issuance of stock related to the rights offering, net of expenses</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings" xlink:label="loc_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:to="lab_bxc_StockIssuedDuringPeriodValueNewIssuesPursuantToRightOfferings_FEDA77E384834D9764FE7243466792A7" xlink:type="arc" />
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68_negatedLabel_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repurchase of shares to satisfy employee tax withholdings (in shares)</link:label>
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68_label_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impact Of Net Settled Shares For Vested Grants, Shares</link:label>
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68_documentation_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents shares of impact of net settled shares for vested grants.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ImpactOfNetSettledSharesForVestedGrantsShares" xlink:label="loc_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:to="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsShares_6340B53E4C4847B3C33C72434667CE68" xlink:type="arc" />
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED_negatedLabel_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repurchase of shares to satisfy employee tax withholdings</link:label>
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED_label_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impact Of Net Settled Shares For Vested Grants, Value</link:label>
    <link:label id="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED_documentation_en-US" xlink:label="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents value of impact of net settled shares for vested grants.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ImpactOfNetSettledSharesForVestedGrantsValue" xlink:label="loc_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:to="lab_bxc_ImpactOfNetSettledSharesForVestedGrantsValue_EEB654518E9F68F932F87243466765ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Other Shares</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Other Shares</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityOtherShares" xlink:label="loc_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3" xlink:to="lab_us-gaap_StockholdersEquityOtherShares_EBA3946984370DBA325572434667CAF3" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Other</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_68402746210A103A73627243466731E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharesOutstanding_DAB1CB43A2831F9EC771724346672D91_periodEndLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_DAB1CB43A2831F9EC771724346672D91" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending balance (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_DAB1CB43A2831F9EC771724346672D91" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesOutstanding_DAB1CB43A2831F9EC771724346672D91" xlink:to="lab_us-gaap_SharesOutstanding_DAB1CB43A2831F9EC771724346672D91" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_A1C65E549E32A56B42F38671D7E51E36_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_A1C65E549E32A56B42F38671D7E51E36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash settled SARs payable within thirty days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_A1C65E549E32A56B42F38671D7E51E36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_A1C65E549E32A56B42F38671D7E51E36" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_A1C65E549E32A56B42F38671D7E51E36" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash settled SARs payable within one year</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Award, Tranche Two [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6DEC8C2759751685EA988671D7E5A5B7" xlink:type="arc" />
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    <link:label id="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570_terseLabel_en-US" xlink:label="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer rebate payable</link:label>
    <link:label id="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570_label_en-US" xlink:label="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Rebate Payable</link:label>
    <link:label id="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570_documentation_en-US" xlink:label="lab_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents customer rebate payable.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CustomerRebatePayable" xlink:label="loc_bxc_CustomerRebatePayable_93B577863DDAF106E82F86EF149F0570" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB_terseLabel_en-US" xlink:label="lab_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shipping and handling costs</link:label>
    <link:label id="lab_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB_label_en-US" xlink:label="lab_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shipping, Handling and Transportation Costs</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB" xlink:to="lab_us-gaap_ShippingHandlingAndTransportationCosts_A47C49563D01FD407CD286EF149F67FB" xlink:type="arc" />
    <link:label id="lab_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA_terseLabel_en-US" xlink:label="lab_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of persons employed on full-time basis</link:label>
    <link:label id="lab_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA_label_en-US" xlink:label="lab_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Number of Employees</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityNumberOfEmployees" xlink:label="loc_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA" xlink:to="lab_dei_EntityNumberOfEmployees_55FC71CC07A794C366CA7268AC5F2DFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_DB9228A65639C5F007348BAFC1FF632B_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_DB9228A65639C5F007348BAFC1FF632B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_DB9228A65639C5F007348BAFC1FF632B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_DB9228A65639C5F007348BAFC1FF632B" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_DB9228A65639C5F007348BAFC1FF632B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_D9C0D3C6B1BBBA0D863D8BAFC1FF4A5D" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income (loss) to cash provided by (used in) operations:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_A5A685A013FD1403A78D8BAFC1FFA177" xlink:type="arc" />
    <link:label id="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of debt issuance costs</link:label>
    <link:label id="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs and Discounts</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23" xlink:to="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_468B17B08BF89365BD5A8BAFC1FF6C23" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_113C5D6507E73779CCFA8BAFC1FFD39D_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties_113C5D6507E73779CCFA8BAFC1FFD39D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Gains from sales of property</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_113C5D6507E73779CCFA8BAFC1FFD39D_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties_113C5D6507E73779CCFA8BAFC1FFD39D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnSaleOfProperties" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties_113C5D6507E73779CCFA8BAFC1FFD39D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SeveranceCosts1_33A890CD0C23B5AF13998BAFC1FFBA4F_terseLabel_en-US" xlink:label="lab_us-gaap_SeveranceCosts1_33A890CD0C23B5AF13998BAFC1FFBA4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Severance charges</link:label>
    <link:label id="lab_us-gaap_SeveranceCosts1_33A890CD0C23B5AF13998BAFC1FFBA4F_label_en-US" xlink:label="lab_us-gaap_SeveranceCosts1_33A890CD0C23B5AF13998BAFC1FFBA4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Severance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="loc_us-gaap_SeveranceCosts1_33A890CD0C23B5AF13998BAFC1FFBA4F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PensionExpense_273DDF08EAAD2C22462F8BAFC1FF2ECD_verboseLabel_en-US" xlink:label="lab_us-gaap_PensionExpense_273DDF08EAAD2C22462F8BAFC1FF2ECD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Pension expense</link:label>
    <link:label id="lab_us-gaap_PensionExpense_273DDF08EAAD2C22462F8BAFC1FF2ECD_label_en-US" xlink:label="lab_us-gaap_PensionExpense_273DDF08EAAD2C22462F8BAFC1FF2ECD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PensionExpense" xlink:label="loc_us-gaap_PensionExpense_273DDF08EAAD2C22462F8BAFC1FF2ECD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_7D71295A0B26B1B1F9F98BAFC1FFD181_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_7D71295A0B26B1B1F9F98BAFC1FFD181" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_7D71295A0B26B1B1F9F98BAFC1FFD181_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_7D71295A0B26B1B1F9F98BAFC1FFD181" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_7D71295A0B26B1B1F9F98BAFC1FFD181" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9" xlink:to="lab_us-gaap_OtherNoncashIncomeExpense_4C4496FA9B8577E4A7458BAFC1FF46F9" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_FDE8AB2201E8764BF75B8BAFC200BFF1" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Receivables</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4" xlink:to="lab_us-gaap_IncreaseDecreaseInReceivables_C5A56A3AA1F00A0A04AA8BAFC200F3E4" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_FA37296AC2F12F309B798BAFC2001F39_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_FA37296AC2F12F309B798BAFC2001F39" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_AC8E4BBA471D2F4FFA548BAFC2011510_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_AC8E4BBA471D2F4FFA548BAFC2011510" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in cash</link:label>
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_3A0246B5B1B9E08605A38BAFC20197C3_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_3A0246B5B1B9E08605A38BAFC20197C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
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    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_D8E9E77BD14DA7EC9BD26E3B64BC548F_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_D8E9E77BD14DA7EC9BD26E3B64BC548F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_D8E9E77BD14DA7EC9BD26E3B64BC548F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_D8E9E77BD14DA7EC9BD26E3B64BC548F" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_D8E9E77BD14DA7EC9BD26E3B64BC548F" xlink:type="arc" />
    <link:label id="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361_terseLabel_en-US" xlink:label="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance</link:label>
    <link:label id="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361_label_en-US" xlink:label="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Insurance [Member]</link:label>
    <link:label id="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361_documentation_en-US" xlink:label="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information regarding insurance.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_InsuranceMember" xlink:label="loc_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:to="lab_bxc_InsuranceMember_503931174111F123FC806E3B64BDD361" xlink:type="arc" />
    <link:label id="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9_terseLabel_en-US" xlink:label="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9_label_en-US" xlink:label="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Cash Escrow [Member]</link:label>
    <link:label id="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9_documentation_en-US" xlink:label="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents other cash escrow.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_OtherCashEscrowMember" xlink:label="loc_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:to="lab_bxc_OtherCashEscrowMember_B27CE818A9DF70B3BD7B6E3B64BD42F9" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalents Items [Line Items]</link:label>
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalents Items [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_CC3A735F78CB595FACCF6E3B64BD9D36" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash in escrow</link:label>
    <link:label id="lab_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Investments [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedCashAndInvestmentsAbstract" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46" xlink:to="lab_us-gaap_RestrictedCashAndInvestmentsAbstract_DF5E1E0FE589AA03A39D6E3B64BDEA46" xlink:type="arc" />
    <link:label id="lab_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0_terseLabel_en-US" xlink:label="lab_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash in escrow</link:label>
    <link:label id="lab_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0_label_en-US" xlink:label="lab_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Escrow Deposit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EscrowDeposit" xlink:label="loc_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0" xlink:to="lab_us-gaap_EscrowDeposit_FA462E21F97DF8925EC56E67B50AEED0" xlink:type="arc" />
    <link:label id="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676_terseLabel_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash in escrow held by lender as a result of distribution facility sale</link:label>
    <link:label id="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676_label_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Escrow Deposit Held By Lender As a Result of Distribution Facility Sale</link:label>
    <link:label id="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676_documentation_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Escrow Deposit Held By Lender As a Result of Distribution Facility Sale</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale" xlink:label="loc_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:to="lab_bxc_EscrowDepositHeldByLenderAsaResultofDistributionFacilitySale_31B0EF29747588B13B116E64FDDBE676" xlink:type="arc" />
    <link:label id="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE_terseLabel_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash in escrow held by lender for capital improvements or to be applied against mortgage</link:label>
    <link:label id="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE_label_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Escrow Deposit Held By Lender For Capital Improvements or to be Applied Against Mortgage</link:label>
    <link:label id="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE_documentation_en-US" xlink:label="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Escrow Deposit Held By Lender For Capital Improvements or to be Applied Against Mortgage</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage" xlink:label="loc_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:to="lab_bxc_EscrowDepositHeldByLenderForCapitalImprovementsortobeAppliedAgainstMortgage_C5F12177C787CFC4195D6E65FE496FAE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net periodic pension cost</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7" xlink:to="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_597E251704C27AD2CCDEC07400749CB7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanInterestCost_DF3D9BB1F02077352758C07400747681_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanInterestCost_DF3D9BB1F02077352758C07400747681" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Interest cost on projected benefit obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_DF3D9BB1F02077352758C07400747681" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanInterestCost_DF3D9BB1F02077352758C07400747681" xlink:to="lab_us-gaap_DefinedBenefitPlanInterestCost_DF3D9BB1F02077352758C07400747681" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C_negatedLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Expected return on plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Return on Plan Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D7B86220CE195286E897C0740074DE6C" xlink:type="arc" />
    <link:label id="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915_verboseLabel_en-US" xlink:label="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amortization of unrecognized loss</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915_label_en-US" xlink:label="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan Amortization Of Unrecognized Gains Losses</link:label>
    <link:label id="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915_documentation_en-US" xlink:label="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amortization of unrecognized gains losses.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses" xlink:label="loc_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:to="lab_bxc_DefinedBenefitPlanAmortizationOfUnrecognizedGainsLosses_AE9D0CF979169E08B419C0740075E915" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4C83055EA6DCE17C9A23C074007505DC_totalLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4C83055EA6DCE17C9A23C074007505DC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net periodic pension cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4C83055EA6DCE17C9A23C074007505DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4C83055EA6DCE17C9A23C074007505DC" xlink:to="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_4C83055EA6DCE17C9A23C074007505DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsDisclosureTextBlock_F3A2CE1AE79897710327810C82DDBEBA_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsDisclosureTextBlock_F3A2CE1AE79897710327810C82DDBEBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash Held in Escrow</link:label>
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    <link:label id="lab_bxc_DefinedBenefitPlanNetAmountsRecognizedinBalanceSheet_6F1AA809F07CE08D15BE8671D80DB8A6_documentation_en-US" xlink:label="lab_bxc_DefinedBenefitPlanNetAmountsRecognizedinBalanceSheet_6F1AA809F07CE08D15BE8671D80DB8A6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Net Amounts Recognized in Balance Sheet</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_DefinedBenefitPlanNetAmountsRecognizedinBalanceSheet" xlink:label="loc_bxc_DefinedBenefitPlanNetAmountsRecognizedinBalanceSheet_6F1AA809F07CE08D15BE8671D80DB8A6" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_DB3FB9ABD9F51E02410F7243463A8A0D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_66FE47921AEECB04C83F7243463AD837_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_66FE47921AEECB04C83F7243463AD837" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expense (benefit) from state income taxes, net of federal benefit</link:label>
    <link:label id="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_66FE47921AEECB04C83F7243463AD837_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_66FE47921AEECB04C83F7243463AD837" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_66FE47921AEECB04C83F7243463AD837" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_169E279EA4D9E4CF84567243463AA70F" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpense" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_B09500B3EAE55CD7D82C7243463A7845" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Next Rolling Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsNextRollingTwelveMonths_1D04BBE8EFC35D5489EC1CAA37457356" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_05DD030E93C1ED1E878C1CAA374516DA" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_741E77879634075A9E9D1CAA37459EFD" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_AD602F249B97A11EDE551CAA374563DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_89D6F70941F7334203281CAA37458C74" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due Thereafter</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_CDF28507083618ECAE571CAA3745EC0E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_DE7FB6D1FBED37F59F9B1CAA37454A0C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total rent expense</link:label>
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98" xlink:to="lab_us-gaap_LeaseAndRentalExpense_A65B6EE2997D3E5FDFEC724344FCED98" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfCapitalLeasedAsssetsTable_EE45909E7227E5814A7D724344FC5351_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCapitalLeasedAsssetsTable_EE45909E7227E5814A7D724344FC5351" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Capital Leased Assets [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfCapitalLeasedAsssetsTable_EE45909E7227E5814A7D724344FC5351_label_en-US" xlink:label="lab_us-gaap_ScheduleOfCapitalLeasedAsssetsTable_EE45909E7227E5814A7D724344FC5351" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Capital Leased Assets [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfCapitalLeasedAsssetsTable" xlink:label="loc_us-gaap_ScheduleOfCapitalLeasedAsssetsTable_EE45909E7227E5814A7D724344FC5351" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalLeasedAssetsLineItems_AA6FF7EFC842A7CCAF7E724344FD00F8_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasedAssetsLineItems_AA6FF7EFC842A7CCAF7E724344FD00F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital Leased Assets [Line Items]</link:label>
    <link:label id="lab_us-gaap_CapitalLeasedAssetsLineItems_AA6FF7EFC842A7CCAF7E724344FD00F8_label_en-US" xlink:label="lab_us-gaap_CapitalLeasedAssetsLineItems_AA6FF7EFC842A7CCAF7E724344FD00F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leased Assets [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasedAssetsLineItems" xlink:label="loc_us-gaap_CapitalLeasedAssetsLineItems_AA6FF7EFC842A7CCAF7E724344FD00F8" xlink:type="locator" />
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    <link:label id="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB_terseLabel_en-US" xlink:label="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of assets under capital leases</link:label>
    <link:label id="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB_label_en-US" xlink:label="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Carrying Amount Of Capital Leases</link:label>
    <link:label id="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB_documentation_en-US" xlink:label="lab_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents carrying amount of capital leases related to trucks and trailers.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CarryingAmountOfCapitalLeases" xlink:label="loc_bxc_CarryingAmountOfCapitalLeases_464505829FE594A4387D724344FD46BB" xlink:type="locator" />
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    <link:label id="lab_bxc_NetBookValueOfCapitalLeases_C4677BC9DB481D030187724344FD0195_documentation_en-US" xlink:label="lab_bxc_NetBookValueOfCapitalLeases_C4677BC9DB481D030187724344FD0195" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net book value of capital leases related to trucks and trailers.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_NetBookValueOfCapitalLeases" xlink:label="loc_bxc_NetBookValueOfCapitalLeases_C4677BC9DB481D030187724344FD0195" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_40EAE311ACDFC1F8CFA4810C851AD6AE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_40EAE311ACDFC1F8CFA4810C851AD6AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facilities</link:label>
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    <link:label id="lab_us-gaap_MovementInValuationAllowancesAndReservesRollForward_D36178000A8D160BDCAD7243462E792A_terseLabel_en-US" xlink:label="lab_us-gaap_MovementInValuationAllowancesAndReservesRollForward_D36178000A8D160BDCAD7243462E792A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Movement in Valuation Allowances and Reserves [Roll Forward]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_D36178000A8D160BDCAD7243462E792A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_1F71F8F552EB780385727243462F278B_periodStartLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_1F71F8F552EB780385727243462F278B" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance as of beginning of the year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1F71F8F552EB780385727243462F278B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsValuationAllowance_1F71F8F552EB780385727243462F278B" xlink:to="lab_us-gaap_DeferredTaxAssetsValuationAllowance_1F71F8F552EB780385727243462F278B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Valuation allowance provided for taxes related to:</link:label>
    <link:label id="lab_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988_label_en-US" xlink:label="lab_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valuation Allowance [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ValuationAllowanceAbstract" xlink:label="loc_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988" xlink:to="lab_us-gaap_ValuationAllowanceAbstract_B427854933E4C05471A27243462F5988" xlink:type="arc" />
    <link:label id="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865_terseLabel_en-US" xlink:label="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">(Income) loss before income taxes</link:label>
    <link:label id="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865_label_en-US" xlink:label="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valuation Allowances Provided For Taxes Related To Income Before Income Taxes</link:label>
    <link:label id="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865_documentation_en-US" xlink:label="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represent represents valuation allowance provided for taxes related to loss before income tax.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes" xlink:label="loc_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:to="lab_bxc_ValuationAllowancesProvidedForTaxesRelatedToIncomeBeforeIncomeTaxes_C31737288711DFF8B6897243462FC865" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_B99C6D4EB38758BB1C607243462F51AC_periodEndLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_B99C6D4EB38758BB1C607243462F51AC" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance as of end of the year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_B99C6D4EB38758BB1C607243462F51AC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsValuationAllowance_B99C6D4EB38758BB1C607243462F51AC" xlink:to="lab_us-gaap_DeferredTaxAssetsValuationAllowance_B99C6D4EB38758BB1C607243462F51AC" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reverse Stock Split</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D" xlink:to="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_E4AB19F9273C6861800A868498BC7D1D" xlink:type="arc" />
    <link:label id="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2_terseLabel_en-US" xlink:label="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal</link:label>
    <link:label id="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2_label_en-US" xlink:label="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Principal Payments on Capital Leases [Abstract]</link:label>
    <link:label id="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2_documentation_en-US" xlink:label="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Principal Payments on Capital Leases [Abstract]</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_PrincipalPaymentsonCapitalLeasesAbstract" xlink:label="loc_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:to="lab_bxc_PrincipalPaymentsonCapitalLeasesAbstract_2E78E264175FE4A0FA1F2279A9E6A6D2" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due Current</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments maturing in the next fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueCurrent_F8ADDC7BC38333D841872279A9E63AC0" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due In Two Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments maturing in the second fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInTwoYears_D7648A7BBBB909CB9D302279A9E6D570" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due In Three Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments maturing in the third fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThreeYears_05BC09729223B06A27D92279A9E648B0" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due In Four Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments maturing in the forth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFourYears_ADC44E837EAA87E91EC42279A9E65596" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due In Five Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments maturing in the fifth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInFiveYears_FE969552A6EFD322F0122279A9E63CBF" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due In Thereafter</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease payments maturing after the fifth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDueInThereafter_BE5F2BF7DD81DFD67EC72279A9E732C0" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014_totalLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Principal Payments Due</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease principal payments for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue" xlink:label="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:to="lab_bxc_CapitalLeasesFutureMinimumPrincipalPaymentsDue_B0C18376C6EA6E87D7B62279A9E7F014" xlink:type="arc" />
    <link:label id="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5_terseLabel_en-US" xlink:label="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5_label_en-US" xlink:label="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Payments on Capital Leases [Abstract]</link:label>
    <link:label id="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5_documentation_en-US" xlink:label="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Payments on Capital Leases [Abstract]</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_InterestPaymentsonCapitalLeasesAbstract" xlink:label="loc_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:to="lab_bxc_InterestPaymentsonCapitalLeasesAbstract_7116AF5CE9ADD153E58B2279A9E78FA5" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due Current</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease interest payments maturing in the next fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueCurrent_DE49F047D6DF09783EAB2279A9E73B06" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due In Two Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease Interest payments maturing in the second fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInTwoYears_EE884BD5B872E8A549242279A9E754B0" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due In Three Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease Interest payments maturing in the third fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThreeYears_A3937B64B93571BF87E32279A9E72B0E" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due In Four Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease Interest payments maturing in the forth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFourYears_B7BC4CD5BD72625ECFC52279A9E73D1E" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due In Five Years</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease Interest payments maturing in the fifth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInFiveYears_D42D0B336FED84D508C22279A9E7D59E" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62_terseLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due In Thereafter</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease payments maturing after the fifth fiscal year following the latest fiscal year for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDueInThereafter_09BC275D7ADBCCF56C212279A9E7AE62" xlink:type="arc" />
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1_totalLabel_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1_label_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases Future Minimum Interest Payments Due</link:label>
    <link:label id="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1_documentation_en-US" xlink:label="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of minimum lease interest payments for capital leases.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_CapitalLeasesFutureMinimumInterestPaymentsDue" xlink:label="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:to="lab_bxc_CapitalLeasesFutureMinimumInterestPaymentsDue_EE4E00BF0140041BE60F2279A9E769B1" xlink:type="arc" />
    <link:label id="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994_verboseLabel_en-US" xlink:label="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of changes in projected benefit obligations and change in plan assets</link:label>
    <link:label id="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994_label_en-US" xlink:label="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Changes In Projected Benefit Obligations and Fair Value Of Plan Assets [Table Text Block]</link:label>
    <link:label id="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994_documentation_en-US" xlink:label="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of changes in projected benefit obligations and fair value of plan assets.</link:label>
    <link:loc xlink:href="bxc-20161231.xsd#bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock" xlink:label="loc_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:to="lab_bxc_ScheduleOfChangesInProjectedBenefitObligationsAndFairValueOfPlanAssetsTableTextBlock_A9D5FA428B08629082B0C07401C64994" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of amounts recognized on consolidated balance sheets</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Amounts Recognized in Balance Sheet [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6" xlink:to="lab_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_2EEFBDDDAB27724AD206C07401C6E9A6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of net periodic pension cost for pension plans</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Defined Benefit Plans Disclosures [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8" xlink:to="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_DB1D1D0D2E6AEF37E2A7C07401C6EDC8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_D4B4F921E8E4C28C58AAC07401C6DF7E_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_D4B4F921E8E4C28C58AAC07401C6DF7E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of assumptions used to determine the projected benefit obligation</link:label>
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