    <SEC-DOCUMENT>0001140361-21-012889-index.html : 20210415
    <SEC-HEADER>0001140361-21-012889.hdr.sgml : 20210415
    <ACCEPTANCE-DATETIME>20210415120104
    ACCESSION NUMBER:		0001140361-21-012889
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		5
    CONFORMED PERIOD OF REPORT:	20210527
    FILED AS OF DATE:		20210415
    DATE AS OF CHANGE:		20210415

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			FOSTER L B CO
    		CENTRAL INDEX KEY:			0000352825
    		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-METALS SERVICE CENTERS & OFFICES [5051]
    		IRS NUMBER:				251324733
    		STATE OF INCORPORATION:			PA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-10436
    		FILM NUMBER:		21827846

    	BUSINESS ADDRESS:
    		STREET 1:		415 HOLIDAY DR
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15220
    		BUSINESS PHONE:		4129283431

    	MAIL ADDRESS:
    		STREET 1:		415 HOLIDAY DR
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15220
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>nc10022339x1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: nc10022339x1_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>logo_lbfoster.jpg
    <TEXT>
    Document 2 - file: logo_lbfoster.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>nc10022339x1_pc01.jpg
    <TEXT>
    Document 3 - file: nc10022339x1_pc01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>nc10022339x1_pc02.jpg
    <TEXT>
    Document 4 - file: nc10022339x1_pc02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>nc10022339x1_piecharts.jpg
    <TEXT>
    Document 5 - file: nc10022339x1_piecharts.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>