![]() These spans are designed with the uniform snow load in mind, emphasizing the importance of considering environmental factors that could impact the structural integrity of the roof.īefore delving deeper into the tables provided in the Ontario Building Code, it’s essential to understand the role of joists, rafters, and beams in a structure. Roof Ridge Beams (Section 4): For roof ridge beams, compliance with the spans specified in Table A-12 is required.Proper adherence to these spans is critical for the stability of the overall structure. These tables provide guidelines for ensuring the appropriate spans based on the specific materials used. Built-Up Wood and Glued-Laminated Timber Floor Beams (Section 3): Spans for built-up wood and glued-laminated timber floor beams are covered in Tables A-8 to A-11.This provision emphasizes the importance of maintaining consistent structural integrity, even for elements not explicitly covered in the specified tables. Floor Joists (Section 2): If floor joists are not selected from Tables A-1 and A-2, and they are required to be designed for the same loading conditions, their spans should not exceed the design requirements for uniform loading and vibration criteria.Compliance with these spans is crucial to meet the basic safety standards. These tables include specifications for uniform live loads, ensuring that the structural elements can safely support the anticipated loads. Wood Joists and Rafters (Section 1): The spans for wood joists and rafters must conform to the values provided in Tables A-1 to A-7.Understanding Joists, Rafters, and BeamsĪrticle 9.23.4.2 outlines the specific regulations regarding spans for wood joists, rafters, and beams.
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