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Old 09-09-2012, 02:52 PM   #1
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Is using greenboard in stall shower a code violation in NJ
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Old 09-09-2012, 03:09 PM   #2
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i don't think green board or any drywall has not been allowed around showers for years. if you use kerdi, they recommend to go over drywall but can go over cement board also. use cement board and waterproof either behind it or over top of it or use the kerdi or similar. if it isn't a code violation it should be. did you plan to waterproof over the green board or just stick tile to it like they used to do.
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Old 09-09-2012, 03:56 PM   #3
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IRC, Chapter 7 - Wall Covering
R702.3.8 Water-resistant gypsum backing board. Gypsum board used as the base or backer for adhesive application of ceramic tile or other required nonabsorbent finish material shall conform to ASTM C 630 or C 1178. Use of water-resistant gypsum backing board shall be permitted on ceilings where framing spacing does not exceed 12 inches (305 mm) on center for 1/2-inch-thick (13 mm) or 16 inches (406 mm) for 5/8-inch-thick (16 mm) gypsum board.
Water-resistant gypsum board shall not be installed over a vapor retarder in a shower or tub compartment. Cut or exposed edges, including those at wall intersections, shall be sealed as recommended by the manufacturer.
R702.3.8.1 Limitations. Water resistant gypsum backing board shall not be used where there will be direct exposure to water, or in areas subject to continuous high humidity.
R702.4.2 Cement, fiber-cement and glass mat gypsum backers. Cement, fiber-cement or glass mat gypsum backers in compliance with ASTM C 1288, C 1325 or C 1178 and installed in accordance with manufacturersí recommendations shall be used as backers for wall tile in tub and shower areas and wall panels in shower areas.

HOWEVER, ALL gypsum wall board products can be used in such areas when they are 100% clad with a suitable and approved waterproof vinyl membrane. There are several on the market today.
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