Finish TradesCâu 248 / 700
On long, continuous drywall walls and ceilings, control (expansion) joints are added to relieve stress. A common guideline places control joints in walls at a MAXIMUM spacing of about:
a.30 feet
b.8 feet
c.100 feet
d.They are never needed indoors
Giải thích
Gypsum board guidance commonly limits partition/wall control joint spacing to a maximum of about 30 feet (and about 50 feet on ceilings without perimeter relief, less otherwise) to control cracking from movement. Eight feet is unnecessarily close, 100 feet is far too long, and long runs do need control joints.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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