Prebuck Window and Door Buck offers the contractor, owner and design community an engineered solution for punched openings. Produced with 1-½” (38 mm) thick, treated Laminated Strand Lumber (LSL), Prebuck Window and Door Buck assures that the rough frame of the opening provides stable support for glazing and finish components. Prebuck offers many customized options that reduce labor and staging costs. The buck frame can be used in combination with any wall structure type, but is ideally suited for wide width walls. Made with materials that allow direct contact with concrete, a cast in place version integrates a dual keyway design to assure a secure interface from concrete to finishes. Prebuck Window and Door Buck will not cup, twist or warp over time and can be cut to custom design specifications.