Construction codes of Ontario

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Undersized Lumber

(1) Joist, rafter, lintel and beam members up to 5% less than the actual Canadian standard sizes are permitted to be used provided the allowable spans for the grade and species of lumber under consideration are reduced 5% from those shown in the span tables for full size members. Article 9.3.2.8 Ontario Regulation 332/12 Building Code, […]

Uniformity and Tolerances for Risers and Treads

Uniformity and Tolerances for Risers and Treads (1) Except as provided in Sentence (2), risers shall be of uniform height in any one flight with a maximum tolerance of, (a) 5 mm between adjacent treads or landings, and (b) 10 mm between the tallest and shortest risers in a flight. (2) Except for required exit stairs, […]

Uniformity of Runs in Flights with Mixed Treads within a House or Dwelling Unit

Uniformity of Runs in Flights with Mixed Treads within a House or Dwelling Unit (1) Except as provided in Sentence (2) and Article 9.8.4.5., where a flight within a house or individual dwelling unit consists of both tapered treads and rectangular treads, all the treads shall have a uniform run when measured at a point 300 […]

Unit Masonry Columns Materials

Unit Masonry Columns Materials (1) Unit masonry columns shall be built of masonry units, (a) conforming to CSA A165.1, “Concrete Block Masonry Units”, and (b) having a compressive strength over the net area of the block of not less than 15 MPa. Article 9.17.5.1 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca […]

Unit Masonry Columns Sizes

Unit Masonry Columns Sizes (1) Unit masonry columns shall be not less than 290 mm by 290 mm or 240 mm by 380 mm in size. Article 9.17.5.2 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Vapour Barrier Materials

Vapour Barrier Materials (1) Vapour barriers shall have a permeance not greater than 60 ng/(Pa∙s∙m2), measured in accordance with ASTM E96 / E96M, “Water Vapor Transmission of Materials”, using the desiccant method (dry cup). (2) Where the intended use of the interior space will result in high moisture generation, the assembly shall be designed according to […]

Vapour Diffusion Control

Vapour Diffusion Control Water vapour can migrate through building envelope assemblies by penetrating through materials by ‘diffusion’. Many activities such as cooking, dishwashing, laundering and bathing release considerable amounts of water vapour into the air and increase its humidity. As water vapour diffuses through assemblies, it can condense on cold surfaces such as the inside […]