The unique TRU-CORE® technology provides uniform dispersion of the treatment throughout the thickness and length of the material, for lasting durability in exterior as well as interior applications. Strength, stiffness and uniformity are all engineered in. And PWT Treated LVL carries a 25-year limited warranty for protection against damage caused by fungal rot, decay, and wood-destroying insects, including Formosan termites. Trust PWT . Engineered for consistent strength – Software calculations and layouts are more convenient and accurate.