Below are samples of framing work, including house remodelations and construction. The framing work consists of construction of floors, walls and roof systems shell (or skeleton). Plywood or oriented strand board (OSB) sheathing is added to the exterior walls and roof, and windows and exterior doors are installed. The final step is protection of wood with house wrap. This prevents liquid water from entering the structure, allows water vapor to escape, and therefore reduces chances of molding and rotting.