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2502.1 Definitions.
The following terms are defined in Chapter 2:
CEMENT BOARD.
CEMENT PLASTER.
EXTERIOR SURFACES.
GYPSUM BOARD.
GYPSUM PANEL PRODUCTS.
GYPSUM PLASTER.
GYPSUM VENEER PLASTER.
INTERIOR SURFACES.
WEATHER-EXPOSED SURFACES.
WIRE BACKING.
Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2014/013.
2504.1 Scope.
The following requirements shall be met where construction involves gypsum board, gypsum panel products or lath and plaster in vertical and horizontal assemblies.
2504.1.1 Wood framing.
Wood supports for lath, gypsum board or gypsum panel products, as well as wood stripping or furring, shall be not less than 2 inches (51 mm) nominal thickness in the least dimension.
Exception: The minimum nominal dimension of wood furring strips installed over solid backing shall be not less than 1 inch by 2 inches (25 mm by 51 mm).
2504.1.2 Studless partitions.
The minimum thickness of vertically erected studless solid plaster partitions of 3/8-inch (9.5 mm) and 3/4-inch (19.1 mm) rib metal lath, 1/2-inch-thick (12.7 mm) gypsum lath, gypsum board or gypsum panel product shall be 2 inches (51 mm).
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