The many functions of the building envelope can
be separated into three categories:

1.  Support (to resist and transfer mechanical loads)
2.  Control (the flow of matter and energy of all types)
3.  Finish (to meet human desires on the inside and outside)

The control function is at the core of good performance, and in practice focuses, in order of importance, on rain control, air control, heat control, and vapor control.


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