Functions of a building envelope
The main function of the building envelope is to provide a controlled internal environment that protects from the variable and uncontrollable external climate. The nature of internal environment is dependant on the end use of the building and this in turn will determine the requirements for the building envelope.

Photo: CileMontgomery
An office building will require control of internal temperature and humidity with appropriate levels of daylight to provide a pleasant working environment. Whereas with a storage barn the only requirement may be to keep the enclosed space dry. Principle building components
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