A wood sheet flooring directly over the joists that supports the underlayment of floor covering.

The first layer of oriented strand board, plywood or planks laid over floor joists.

A wood sheet flooring directly over the joist that supports the underlayment or floor covering.

Rough boards, plywood, flakeboard, or oriented strand board laid on top of the floor joists, to which the finish floor is fastened.

The sheathing, usually made of plywood, placed on top of floor joists and covered by flooring.

A wood or fibrous material that is nailed to the floor joists and then receives the finished flooring.

Certain material, like plywood, that is installed on the floor joists of a building or structure, onto which the walls and finished flooring is attached.