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How do I treat the horizontal butt joints of the 1-inch Sheetrock® Brand Gypsum Liner Panels in a USG Cavity Shaft Wall?
The Fire Resistance Rating does not require any joint finishing of the horizontal butt joints of the 1" Liner Panels. We do recommend for heights greater than 12 feet the horizontal butt joints be staggered for proper structural integrity of the wall system. Please refer to USG Cavity Shaft Wall System Catalog (SA926) for additional information.