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

9.23.4.2 — Spans for Joists, Rafters and Beams

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(1) Except as required in Sentence (2) and Article 9.23.13.10., the spans for wood joists and rafters shall conform to the spans shown in Tables A-1 to A-7 for the uniform live loads shown in the Tables.
(2) Spans for floor joists that are not selected from Tables A-1 and A-2 and that are required to be designed for the same loading conditions, shall not exceed the design requirements for uniform loading and vibration criteria.
(3) Spans for built-up wood and glued-laminated timber floor beams shall conform to the spans in Tables A-8 to A-11.
(4) Spans for roof ridge beams shall conform to the spans in Table A-12 for the uniform snow load shown.
Tables & Figures referenced
Table A-1 : Maximum Spans for Floor Joists – General Cases(1) : Forming Part of Sentence 9.23.4.2.(1)
Loading Table A-1…
Table A-2 : Maximum Spans for Floor Joists – Special Cases(1) : Forming Part of Sentence s 9.23.4.2.(1) and 9.23.4.4.(2)
Loading Table A-2…
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-8 : Maximum Spans for Built-up Floor Beams Supporting not more than One Floor(1)(2) : Forming Part of Sentence 9.23.4.2.(3)
Loading Table A-8…
Table A-11 : Maximum Spans for Glue-Laminated Floor Beams – 20f-E Grade(1) : Forming Part of Sentence 9.23.4.2.(3)
Loading Table A-11…
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…
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