Cementitious Backer Units

materials for other locations must have flame spread

rating of 75 or less and smoke developed rating of

100 or less. Flame spread rating greater than 75

and smoke developed rating greater than 100 are not

permitted. Refer to MIL-HDBK-1008, "Fire Protection

for Facilities Engineering, Design and

Construction," for further guidance on specifying

flame spread and smoke developed ratings.

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NOTE: If the optional phrase "as selected" is not

used to designate a color (and pattern), insert a

manufacturer's name and color (and pattern)

designation in the blank and add the following to

the end of this paragraph "The manufacturer's name

and catalog designation are provided in order to

describe the color (and pattern) desired. Other

manufacturer's products having a similar color (and

pattern) will be acceptable."

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NOTE: Insert designations of rooms or areas in

which different flame spread and smoke developed

ratings are required.

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ASTM C 960/C 960M, [regular] [Type X] gypsum board, 1200 mm 48 inches wide,

[12.7] [15.9] mm [1/2] [5/8] inch thick, with a decorative wall covering

(Class I) [or coating (Class II)] applied in-plant by the gypsum board

manufacturer. The color [and pattern] of wall covering shall be [_____]

[as selected]. [Edges shall be square with a slight bevel to produce a

shallow vee joint. Wrap wall covering around edges.] Predecorated gypsum

board, when tested in accordance with ASTM E 84, shall have [a flame spread

rating of 25 or less and a smoke developed rating of 50 or less for

[_____]] [and] [a flame spread rating of 75 or less and a smoke developed

rating of 100 or less for [_____]].

2.1.8

Cementitious Backer Units

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NOTE: For adhesive applied ceramic tile in wet areas

(tubs, shower enclosures, saunas, steam rooms, gang

shower rooms), specify only cementitious backer

units.

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ANSI A108.1.

2.1.9

Joint Treatment Materials

ASTM C 475.

2.1.9.1

Embedding Compound

Specifically formulated and manufactured for use in embedding tape at

gypsum board joints and compatible with tape, substrate and fasteners.

SECTION 09250

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