Building Envelope

A Building Envelope is the exterior surface of a building's construction--the walls, windows, floors, roof, and floor. Also called building shell.
Other /More definition:
A BUILDING ENVELOPE is Elements of the building, including all external building materials, windows, and walls, that enclose the internal space.
Other /More definition:
A BUILDING ENVELOPE is Elements of the building, including all external building materials, windows, and walls, that enclose the internal space.