2.1.1.3
Type X (Special Fire-Resistant)
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, [tapered]
[tapered and featured] edges.
2.1.2
Gypsum Backing Board
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NOTE: When thicker board is needed, replace the term
"backing board" with "coreboard", and change
dimension to 19.05-25.4 mm 3/4"-1", depending on
system used.
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ASTM C 442/C 442M, gypsum backing board shall be used as a base in a
multilayer system.
2.1.2.1
Regular
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, square
edges.
2.1.2.2
Foil-Backed
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, square
edges.
2.1.2.3
Type X (Special Fire-Resistant)
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, square
edges.
2.1.3
Regular Water-Resistant Gypsum Backing Board
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NOTE: For adhesive applied ceramic tile in wet
areas (tubs, shower enclosures, saunas, steam rooms,
gang shower rooms, etc.), use cementitious backer
units (ANSI A108.1) as a substrate. Specify ASTM C
630/C 630M or ASTM C 1178/C 1178M for all other
tiled areas including areas where only ceramic or
quarry tile base is to be installed, and for
ceilings in humid areas. When using water-resistant
gypsum backing board at tile applications, the metal
studs should not be spaced more than 406 mm 16
inches o.c. Specify moisture resistant gypsum board
ASTM C 630/C 630M for humid areas that are not
exposed to direct moisture.
When using moisture resistant board on ceilings,
spacing of supports should be no more than 305 mm 12
inch on center.
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ASTM C 630/C 630M
2.1.3.1
Regular
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, tapered
SECTION 09250
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