9.23.10.1.Stud Size and Spacing

(1) Except as provided in Sentence (2), the size and spacing of studs shall conform to Table 9.23.10.1. Table 9.23.10.1. Size and Spacing of Studs Forming Part of Sentence 9.23.10.1.(1) Maximum Minimum Stud Size, Maximum Stud Type of Wall Supported Loads (including dead loads) Unsupported mm Spacing, mm Height, m 38 × 38 400 2.4 No load 38 × 89 flat(1) 400 3.6 38 × 64 600 3.0 38 × 64 flat(1) 400 2.4 Attic not accessible by a stairway 38 × 89 600 3.6 38 × 89 flat(1) 400 2.4 Attic accessible by a stairway plus one floor Roof load plus one floor 38 × 89 400 3.6 Interior Attic not accessible by stairway plus 2 floors Roof load, Attic accessible by a stairway 38 × 64 400 2.4 Attic not accessible by a stairway plus one floor 38 × 89 600 3.6 38 × 89 300 3.6 Attic accessible by a stairway plus 2 floors 64 × 89 400 3.6 Roof load plus 2 floors 38 × 140 400 4.2 Attic accessible by a stairway plus 3 floors 38 × 140 300 4.2 Roof load plus 3 floors 38 × 64 400 2.4 Roof with or without attic storage 38 × 89 600 3.0 38 × 89 400 3.0 Roof with or without attic storage plus one floor 38 × 140 600 3.0 Exterior 38 × 89 300 3.0 Roof with or without attic storage plus 2 floors 64 × 89 400 3.0 38 × 140 400 3.6 Roof with or without attic storage plus 3 floors 38 × 140 300 1.8 Notes to Table 9.23.10.1.: (1) See Article 9.23.10.3. (2) Studs for walls not listed in Table 9.23.10.1. and supporting roof loads shall conform to Span Tables 9.23.10.1.-A to 9.23.10.1.-D, provided (a) the studs are clad with not less than 9.5 mm thick plywood, OSB or waferboard sheathing on the exterior face, and not less than 12.5 mm gypsum board on the interior face, (b) solid bridging is provided at not more than 1.2 m o.c, (c) the studs are fastened to the top and bottom plates with no fewer than three 82 mm toe nails, (d) the double top plates are fastened together with not less than 76 mm nails spaced not more than 200 mm o.c, (e) roof framing members spaced not more than 600 mm are fastened to the top plates with no fewer than four 82 mm toe nails, and (f) the bottom plate is fastened to the floor joists, blocking or rim joist with not less than 82 mm nails spaced not more than 200 mm o.c. (See Note A-9.23.10.1.(2)