OSB, or oriented strand board, has a flaked appearance and bumpy texture. It's a solid and popular choice for an underlayer for carpeting, tile, hardwood flooring, wall sheathing, and roofs. OSB is made of many layers of chipped-up lower-grade wood; these are the strands. These strands are arranged flat and then oriented perpendicular to each other. Cross-hatched strands impregnated with resins help create stability in OSB. Oriented strand board is primarily intended to be a functional board, not a finished board. It is widely used and accepted within the building and remodeling industry for its low cost, high strength, and availability. It is sometimes used as a finished surface in utility areas like sheds, laundry rooms, mudrooms, and basements.