Construction codes of Ontario

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Sheating Membrane

Sheating Membrane In conventional wood-frame construction, sheathing membranes are applied over the OSB or plywood sheathing in horizontal strips, shingle-lapped at the joints and stapled. When rigid or semi-rigid insulation is applied over the exterior of wall sheathing, the sheathing membrane may be applied over the outside face of the insulation (when the outboard insulation […]

Structural insulated panels system (SIPS)

Structural insulated panels system (SIPS) Structural insulated panels consisting of an outer and inner layer of plywood or OSB bonded to a polystyrene insulation core provide both structural rigidity and high insulation levels. As most studs in the wall assembly have been eliminated, SIPs have negligible thermal bridging. The joints between SIP panels should be […]

Table – Fasteners for Sheathing and Subflooring

Table – Fasteners for Sheathing and Subflooring Table 9.23.3.5. Forming Part of Sentence 9.23.3.5.(1) Table 9.23.3.5 Ontario Regulation 332/12 Building Code, O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021.

Termite and Decay Protection

(1) In localities where termites are known to occur, (a) clearance between structural wood elements and the finished ground level directly below them shall be not less than 450 mm and, except as provided in Sentence (2), all sides of the supporting elements shall be visible to permit inspection, or (b) structural wood elements, supported […]

Truss or Rafter-Type Roof Ceilings

Truss or Rafter-Type Roof Ceilings Before the 1970s, conventional roof trusses were usually about 150 mm (6 in.) deep where they rested on exterior walls, which didn’t leave much space for attic insulation. Since the oil crisis of the 1970s, roof trusses have a “raised heel” design at the plane of the exterior wall, which […]

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 […]