Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Application

9.23.4.1. application

(1) Spans provided in this Subsection for joists, beams and lintels supporting floors shall apply only where,

(a) the floors serve residential areas as described in Table 4.1.5.3., or

(b) the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.

(2) Spans for joists, beams and lintels supporting floors shall be determined according to Subsection 4.1.3. where the supported floors,

(a) serve other than residential areas, or

(b) support a uniform live load in excess of that specified for residential areas.

In Plain Language

This article sets out when the span requirements in this Subsection apply, covering how far joists, rafters, and beams can safely reach between supports.

This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.