The Ontario Building Code | Strapping and Bridging in Tables A-1 and A-2

9.23.9.4. Strapping and Bridging in Tables A-1 and A-2

(1) Except as permitted by Sentence (5), where strapping is specified in Table A-1, it shall be,

(a) not less than 19 mm by 64 mm, nailed to the underside of floor joists,

(b) located not more than 2.1 m from each support or other rows of strapping, and

(c) fastened at each end to a sill or header.

(2) Where bridging is specified in Table A-1, it shall consist of not less than 19 mm by 64 mm or 38 mm by 38 mm cross bridging located not more than 2.1 m from each support or other rows of bridging.

(3) Where bridging and strapping are specified in Table A-1,

(a) bridging shall,

(i) comply with Sentence (2), or

(ii) consist of 38 mm solid blocking located not more than 2.1 m from each support or other rows of bridging and securely fastened between the joists, and

(b) except as provided in Sentence (5), strapping shall comply with Sentence (1) and be installed under the bridging.

(4) Bridging specified in Table A-2 shall consist of,

(a) bridging as described in Sentence (2), or

(b) 38 mm solid blocking located not more than 2.1 m from each support or other rows of bridging and securely fastened between the joists.

(5) Strapping described in Sentence (1) and Clause (3)(b) is not required where,

(a) furring strips complying with Table 9.29.3.1. are fastened directly to the joists, or

(b) a panel-type ceiling finish complying with Subsection 9.29.5., 9.29.6., 9.29.7., 9.29.8., or 9.29.9. is attached directly to the joists.

(6) Where a ceiling attached to wood furring is specified in Table A-2,

(a) the ceiling finish shall consist of gypsum board, plywood or OSB not less than 12.7 mm thick, and

(b) the furring shall be,

(i) 19 mm by 89 mm wood furring spaced at not more than 610 mm o.c., or

(ii) 19 mm by 64 mm wood furring spaced at not more than 406 mm o.c.