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Green board or cement-backer board


voight
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This is what Chad referenced. it only applies to tile.

702.4 Ceramic tile.

702.4.1 General.

Ceramic tile surfaces shall be installed in accordance with ANSI A108.1, A108.4, A108.5, A108.6, A108.11, A118.1, A118.3, A136.1 and A137.1.

702.4.2 Gypsum backer.

Gypsum board utilized as the base or backer for adhesive application of ceramic tile or other nonabsorbent finish material shall conform with ASTM C630 or C1178. Water-resistant gypsum backing board shall be permitted to be used on ceilings where framing spacing does not exceed 12 inches (305 mm) on center for 1/2-inch-thick (12.7 mm) or 16 inches (406 mm) for 5/8 inch-thick (15.9 mm) gypsum board. Water-resistant gypsum board shall not be installed over a vapor retarder in a shower or tub compartment. All cut or exposed edges, including those at wall intersections, shall be sealed as recommended by the manufacturer.

702.4.3 Limitations.

Water-resistant gypsum backing board shall not be used in the following locations:

1. Over a vapor retarder in a shower or bathtub compartment.

2. Where there will be direct exposure to water, or in areas subject to continuous high humidity.

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