The "Building Envelope" is the area that separates conditioned space from unconditioned space or the outdoors.
A building envelope includes all elements of a building that enclose conditioned space. Building envelope components separate conditioned spaces from unconditioned spaces or from outside air. For example, walls and doors between living areas are part of the building envelope; walls separating a garage from the living areas are not. Besides that, floors of conditioned basements and foundation are technically part of the building envelope. Roof and ceiling also can consider as building envelope.
You can think of the building envelope as the boundary separating the inside from the outside and through which heat is transferred. Areas that have no heating or cooling sources are considered to be outside the building envelope. A space is conditioned if heating and/or cooling is deliberately supplied to it or is indirectly supplied through not insulated surfaces of water or heating equipment or through not insulated ducts.
In the graphic, the building envelope is the area surrounded by insulation (red line).
Foundation
Foundation is one of the important physical components of building envelope especially for high rise building. Besides, foundation can directly influence the overall structural integrity of high rise building. Thus, durability of building enclosure systems is very significant. A foundation is the base on which a building rests and its purpose is to safely transfer the load of a building to a suitable subsoil. High rise buildings are much massive and taller than low-rise building. Therefore, its foundation is necessary to be hard and stable so that can provide stability to the structure and prevent failure due to unequal settlement and failure of the subsoil due to shear. According to Uniform Building By-Law 1984, Section 73, stated that the foundation of a building shall:
(a) Safely sustain and transmit to the
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