Plywood subflooring is nails on top of the floor system so that however you decide to floor your house it can be done on top of the plywood. The plywood is pretty much like the base boarding of the floors. It is important because without it I don't really think the flooring would be done right.
Structural Wall Sheathing
Wall sheathing is the layer of the walls that is on top of the wall studs and in between them. If it wasn't for wall sheathing we wouldn't be able to hang up pictures in our houses. After the wall sheathing you put the drywall on top of it.
Building Facade (Wood Siding)
A building facade is located on the exterior of any home or building. It is very important because it sets the tone for the rest of the home or building. The building facade is very energy efficient.