2.2.3
Bridging
Bridging in loadbearing walls shall conform to ASTM C 955. Bridging shall
be minimum 19 mm 3/4 inch wide by 11 mm 7/16 inch deep cold-rolled steel
channel with weld attachment clips at each stud location or V-bar type weld
or screw attached to each stud flange. Bridging shall be adequate to
provide lateral support for the stud.
2.3
METAL WALL FURRING
Metal wall furring channels shall conform to ASTM C 645. Furring channels
shall be formed from cold-rolled steel, 19 mm 3/4 inch wide by 11 mm 7/16
inch deep, made from G40 hot-dip galvanized coated sheet.
2.4
SUSPENDED CEILING FRAMING
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NOTE: Consult manufacturer's data for calculating
design performance.
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Suspended ceiling framing system shall have the capability to support the
finished ceiling, light fixtures, air diffusers, and accessories, as shown.
The suspension system shall have a maximum deflection of L/240. Carrying
channels shall be formed from minimum 1.40 mm 0.0548 in thick cold-rolled
steel, 38 mm 1-1/2 inch wide by 11 mm 7/16 inch deep. Cross furring
members shall conform to ASTM C 645, and shall be formed from cold-rolled
steel, 19 mm 3/4 inch wide by 11 mm 7/16 inch deep. Carrying channels and
furring members shall be made from hot-dip galvanized coated sheet.
2.5
TRIM, MOLDINGS, AND ACCESSORIES
2.5.1
Hangers
Suspended ceiling runner channel hangers shall be [soft, annealed steel
wire not less than No. 8 SWG nominal diameter, conforming to ASTM A 853]
[or] [flat iron or steel straps, at least 2 x 22 mm 3/32 x 7/8 inch size,
coated with zinc, cadmium, or rust-inhibiting paint].
2.5.2
Fastenings
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NOTE: In areas where adequate ventilation is
provided to prevent extended moisture accumulation
above supported lath and where dissimilar metals are
not present in sufficient amounts to promote a
galvanic chemical reaction, galvanized-steel tie
wire, clips, rings and other fastenings will be
specified exclusively for ceiling construction.
When the above conditions are not satisfied, only
corrosion-resistant steel or nickel-copper alloy
will be used for ceiling construction. Edit
accordingly.
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Tie wire, rings, and other fastenings shall be corrosion-resisting steel
conforming to ASTM A 580/A 580M, composition 302, 304, or 316, Condition A,
or nickel-copper alloy conforming to ASTM B 164, annealed condition.
SECTION 09200A
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