Bison Building Materials Limited began as Roy W. Bierschwale's small retail store and lumber shed in 1962. During the past four decades, Bison has grown into one of Texas' largest independent suppliers of lumber, full-service millwork and other value-added products. The company operates 13 divisions in Texas and Colorado, which provide construction packages that range from form lumber to roof decking, as well as a range of commodity and custom doors, columns, cabinet doors, molding, plywood and stair parts. All materials are delivered directly to its clients' jobsites. Bison Building Materials Limited is based in Houston.