12TH EDITION National Gypsum Construction Guide
from wood, concrete and steel joists. RECOMMENDATIONS 1. Control joints should be installed in ceilings without perimeter relief with a max-imum distance between such joints of 30' with a maximum undivided area of 900 sq. ft. With perime-ter relief, maximum dis-tance is 50' with maximum undivided area of 2500 sq.ft. 2. Use three-coat plastering ...