Because the glass-aluminum curtain wall is exposed to the outside environment, thermal expansion and contraction must be taken into account in the design of the wall. In a stick-built curtain wall, are the movement joints (called expansion joints) provided in both rails and mullions? If provided in only one of the two members, which one and why?
What will be an ideal response?
Expansion joints are provided in mullions only because they cover the entire building's height. They are not
provided in rails because of their short lengths?typically 4 to 6 ft.
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