Div. B › Part 9 › 9.23 › 9.23.4 — Maximum Spans

9.23.4.5 — Heavy Roofing Materials

Copied! ▲ ▼
(1) Where a roof is required to support an additional uniform dead load from roofing materials such as concrete roofing tile, or materials other than as specified in Section 9.26., such as clay roofing tiles, the additional load shall be allowed for by reducing,
(a) the spans for roof joists and rafters in Tables A-4 to A-7, or the spacing of the members, and
(b) the spans for ridge beams and lintels in Tables A-12 to A-16.
Tables & Figures referenced
Table A-4 : Maximum Spans for Roof Joists – Specified Roof Snow Loads 1.0 to 2.0 kPa : Forming Part of Sentence 9.23.4.2.(1)
Loading Table A-4…
Table A-7 : Maximum Spans for Roof Rafters – Specified Roof Snow Loads 2.5 and 3.0 kPa : Forming Part of Sentence 9.23.4.2.(1)
Loading Table A-7…
Table A-12 : Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only – No. 1 or No. 2 Grade : Forming Part of Sentences 9.23.4.2.(4), 9.23.12.3.(1) and (3), 9.23.13.8.(2) and 9.37.3.1.(1)
Loading Table A-12…
Table A-16 : Maximum Spans for Glued-Laminated Timber Lintels – 20f-E Stress Grade – Exterior Walls – Roof and Ceiling Load Only : Forming Part of Sentences 9.23.12.3.(1) and (3) and 9.37.3.1.(1)
Loading Table A-16…
Disclaimer. This site provides general access to Ontario Building Code information for reference only. It is not an official source and may omit or summarize content. Always verify requirements with the current OBC and your Authority Having Jurisdiction (AHJ). The Ontario Building Code is Crown copyright © King’s Printer for Ontario. Terms of Use.