OSB is less expensive than plywood, more available, and stronger in shear because all the strands interlock. It is now more widely used than plywood in residential buildingfor sheathing, subflooring and many other uses, including engineered structural components. Besides using chipped or stranded small-diameter trees as their wood source, engineered sheet goods can also incorporate recycled newsprint, agricultural waste, or recycled wood waste. Some contain recycled post-consumer paper, by-product gypsum and recovered gypsum, wood chips from "non-commercial" trees, and annuallyrenewable agricultural fibers. Examples include hardboard made from waste wood; wallboard made from perlite, gypsum, and recycled post-consumer newsprint; 100 percent recycled newsprint fiberboard; and fiberboard made from straw. At the cuttingedge of engineered sheet goods are those made from agricultural wastelike WheatBoard and Primeboard, made from wheat straw and bound with formaldehyde-free glues (Hayes, 1998).