sheathed material which is laid directly across the floor joists to form the floor. Can be particle board, but plywood is preferable.
Usually, plywood sheets that are nailed directly to the floor joists and that receive the finish flooring.
Generally referred to as the floor's structural layer. This could be a concrete slab, or a layer of some type of wood or particle board directly attached to the floor joists.
The first layer of plywood or planks laid over the floor joists.
The primary surface just covering the floor joist. This floor is typically a tongue and groove product.
The flooring installed over joists to provide a solid surface for carpet, tiles, etc. Can be plywood, OSB, T&G or concrete (concrete would not be over joists).
The concrete flooring, or wood flooring installed over joists to provide a solid surface for carpet, tiles, etc. Can be plywood, OSB, T&G
Usually, boards or plywood nailed to the sill and joists, over which the finished floor is laid.
The sheathing (plywood or wafer board, etc.) nailed or screwed to the top of a floor joist. The sub floor is the backing of carpeting, tile or other flooring.
The framing components of a floor to include the sill plate, floor joists, and deck sheeting over which a finish floor is to be laid.