1. The requirements for application of gypsum board in this Subsection apply to the single layer application of gypsum board to wood furring or framing using nails or screws.
2. Gypsum board applications not described in this Subsection shall conform to CSA A82.31-M, "Gypsum Board Application."

1. Gypsum products shall conform to
   1. ASTM C 1178/C 1178M, "Coated Glass Mat Water-Resistant Gypsum Backing Panel," or
   2. ASTM C 1396/C 1396M, "Gypsum Board," except that the flame-spread rating of gypsum board shall be determined in accordance with CAN/ULC-S102, "Test for Surface Burning Characteristics of Building Materials and Assemblies."

1. Maximum spacing of supports for gypsum board applied as a single layer shall conform to Table 9.29.5.3.

Table 9.29.5.3.
Spacing of Supports for Gypsum Board
Forming Part of Sentence 9.29.5.3.(1)

1. Gypsum board supporting insulation shall be not less than 12.7 mm thick.

1. The length of fasteners for gypsum board shall conform to Table 9.29.5.5., except that lesser depths of penetration are permitted for assemblies required to have a fire-resistance rating provided it can be shown, on the basis of fire tests, that such depths are adequate for the required rating.

Table 9.29.5.5.
Fastener Penetration into Wood Supports
Forming Part of Sentence 9.29.5.5.(1)

1. Nails for fastening gypsum board to wood supports shall conform to
   1. ASTM F 1667, "Driven Fasteners: Nails, Spikes, and Staples," or
   2. CSA B111, "Wire Nails, Spikes and Staples."

1. Screws for fastening gypsum board to wood supports shall conform to ASTM C 1002, "Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs."

1. For single-layer application on a ceiling, nails shall be spaced
   1. not more than 180 mm o.c. on ceiling supports, or
   2. every 300 mm o.c. along ceiling supports, in pairs about 50 mm apart.
2. Where the ceiling sheets are supported by the wall sheets around the perimeter of the ceiling, this support may be considered as equivalent to nailing at this location.
3. Except as required by Sentence (4), for single-layer application on walls, nails shall be spaced
   1. not more than 200 mm o.c. on vertical wall supports, or
   2. every 300 mm o.c. along vertical wall supports, in pairs about 50 mm apart.
4. For single-layer application on walls, where gypsum board provides required bracing in braced wall panels, lateral support for studs, or fire protection, nails shall be spaced not more than 200 mm o.c. on
   1. vertical wall supports, and
   2. top and bottom plates. (See Article 9.23.10.2. and Section 9.10.)
5. The uppermost nails on vertical wall supports shall be not more than 200 mm below the ceiling.
6. Nails shall be located not less than 10 mm from the side or edge of the board.
7. Nails shall be driven so that the heads do not puncture the paper.

1. For single-layer application on a ceiling, screws shall be spaced not more than 300 mm o.c. on ceiling supports.
2. Where the ceiling sheets are supported by the wall sheets around the perimeter of the ceiling, this support may be considered as equivalent to screwing at this location.
3. Except as required by Sentence (4), for single-layer application on walls, screws shall be spaced
   1. not more than 300 mm o.c. on vertical wall supports where the supports are more than 400 mm o.c., or
   2. not more than 400 mm o.c. on vertical wall supports where the supports are not more than 400 mm o.c.
4. Except as provided in Sentence (5), for single-layer application on walls, where gypsum board provides required bracing in braced wall panels, lateral support for studs, or fire protection, screws shall be spaced not more than 300 mm o.c. on
   1. vertical wall supports, and
   2. top and bottom plates. (See Article 9.23.10.2. and Section 9.10.)
5. Where a fire-resistance rating is determined based on Table 9.10.3.1.-A, Sentence (4) need not apply for the purpose of fire protection.
   1. Screws shall be located not less than 10 mm from the edge of the board.
   2. Screws shall be driven so that the heads do not puncture the paper.

1. In cold weather, heat shall be provided to maintain a temperature not below 10°C for 48 h prior to taping and finishing and maintained for not less than 48 h thereafter.