Framing & StructuralQuestion 352 of 700
CALCULATION: Cement plaster control joints are recommended to divide large wall areas into panels not exceeding 144 square feet. On a wall panel 8 feet tall, at about what horizontal spacing should control joints fall to stay within that limit?
a.6 feet
b.12 feet
c.18 feet
d.24 feet
Explanation
Area = height x length, so length = 144 / 8 = 18 feet. Control joints spaced about 18 feet apart keep each 8-foot-tall panel at roughly 144 square feet. Six or twelve feet would create smaller panels than required, and 24 feet gives 192 square feet, exceeding the 144-square-foot guideline.
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