what is sheathing plywood

Plywood sheathing, also known as structural plywood, is a type of plywood designed for permanent structures. It is strong, inexpensive, and used in areas hidden from view that offer support, such as floors, walls, roofs, and garages in residential construction. It is typically used for exterior walls, floors, and roofs, and is designed to be covered and protected by other materials, such as roof felt, underlayment, flashing, and siding. Plywood sheathing is made from thin wood veneers glued together, and its cross-grain pattern adds strength and stability, resisting shrinkage and expansion caused by moisture