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The Ontario Building Code | Stud Size and Spacing

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)

Item

Column 1

Type of wall

Column 2

supported Loads (including dead loads)

Column 3

Minimum stud Size, mm

Column 4

Maximum stud Spacing, mm

Column 5

Maximum Unsupported Height, m

1.

interior

No load

38 × 38

406

2.4

38 × 89 flat(1)

406

3.6

attic not accessible by a stairway

38 × 64

610

3.0

38 × 64 flat(1)

406

2.4

38 × 89

610

3.6

38 × 89 flat(1)

406

2.4

attic accessible by a stairway plus 1 floor

38 × 89

406

3.6

Roof load plus 1 floor

attic not accessible by stairway plus 2 floors

Roof load,

attic accessible by a stairway

38 × 64

406

2.4

attic not accessible by a stairway plus 1 floor

38 × 89

610

3.6

attic accessible by a stairway plus 2 floors

38 × 89

305

3.6

Roof load plus 2 floors

64 × 89

406

3.6

38 × 140

406

4.2

attic accessible by a stairway plus 3 floors

38 × 140

305

4.2

Roof load plus 3 floors

2.

exterior

Roof with or without attic storage

38 × 64

406

2.4

38 × 89

610

3.0

Roof with or without attic storage plus 1 floor

38 × 89

406

3.0

38 × 140

610

3.0

Roof with or without attic storage plus 2 floors

38 × 89

305

3.0

64 × 89

406

3.0

38 × 140

406

3.6

Roof with or without attic storage plus 3 floors

38 × 140

305

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 Tables A-30 to A-33, 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 610 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.