5. Employee Stock-Based Compensation

Time Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 261,000 RSUs to employees under our 2014 Incentive Plan for which vesting is based solely on continuous employment over the requisite service period. The RSUs vest at 33% per year at each anniversary of the grant date over the next three years. The weighted average grant date fair value for these RSUs was $21.19 per unit, which was based on the closing stock price on the grant date.

Performance and Service Condition Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 131,000 RSUs to employees under our 2014 Incentive Plan, that vest if the compound annual growth rate of the Company’s total sales in 2020 over 2017 exceeds a composite annual growth rate based on single-family housing starts, multi-family housing starts, and growth in repair and remodeling sales over the same period. Assuming continued employment and if the performance vesting condition is achieved, these awards will cliff vest on the third anniversary of the grant date. The weighted average grant date fair value for these RSUs was $21.19 per unit, which was based on the closing stock price on the grant date.

Market and Service Condition Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 131,000 RSUs to employees under our 2014 Incentive Plan for which vesting is contingent upon the Company’s total shareholder return being equal to or exceeding 75% of the median total shareholder return of the Company’s peer group if the median return of the Company’s peer group is positive, or being equal to or better than 125% of the median total shareholder return if the median return of the Company’s peer group is negative. In each case, the measurement will take place over a three year period. Assuming continued employment and if the market vesting condition is met, these awards will cliff vest on the third anniversary of the grant date. The actual number of shares of common stock that may be earned ranges from zero to a maximum of 150% of the RSUs granted. The average grant date fair value for these RSUs was $22.57 per unit, which was determined using the Monte Carlo simulation model using the following assumptions:

Expected volatility (company)	53.9%
Expected volatility (peer group median)	28.4%
Correlation between the company and peer group median	0.39
Expected dividend yield	0.00%
Risk-free rate	2.3%

The expected volatilities and correlation are based on the historical daily returns of our common stock and the common stocks of the constituents of the Company’s peer group over the most recent period equal to the measurement period. The expected dividend yield is based on our history of not paying regular dividends in the past and our current intention to not pay regular dividends in the foreseeable future. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant and has a term equal to the measurement period.