An outside wall of a building, either above or below grade.

An above-grade wall enclosing conditioned space. Includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard ro [..]

That portion of a building enclosing the entire building area and consisting of all parts of the structural system, including framing and cover material. Exterior walls extend from the bottom floor le [..]