Engineered lumber improves upon the natural strength and durability of sawn wood by compressing it and laminating or applying other adhesives to add strength. It is an environmentally friendly materials choice because it is made from all parts of the trees used, and the trees used are of the fast-growing varieties like poplar, fir, aspen and pine. Because of the additional strength of engineered lumber, it is ideal for providing structural support when you want to remove all or part of a load-bearing wall. Engineered wood is also used to make roof beams and trusses, and floor joists, and can be substituted in framing walls for standard 2×4 and 2×6 sawn lumber. Engineered lumber is less subject to warping, crowning, sagging and less subject to mold and mildew.