Construction codes of Ontario

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Minimizing and Preventing Ingress and Damage

Minimizing and Preventing Ingress and Damage (1) Except where exterior walls are protected from precipitation or where it can be shown that ingress will not adversely affect occupant health or safety, exterior walls shall be designed and constructed to, (a) minimize the ingress of precipitation into the assembly, and (b) prevent ingress into interior space. (2) Except […]

Minor Combustible Components

(1) The following minor combustible components are permitted in a building required to be of noncombustible construction: (a) paint, (b) self-adhesive tapes, mastics and caulking materials applied to provide flexible seals between the major components of exterior wall construction, (c) fire stops conforming to Sentence 3.1.9.1.(1) and fire blocks conforming to Article 3.1.11.7., […]

Moisture, Air Leakage, Vapour Diffusion and Heat Transfer Control

Moisture, Air Leakage, Vapour Diffusion and Heat Transfer Control In modern wood-frame houses, continuous insulation is needed to provide energy efficiency and comfort. A continuous air barrier system will restrict air movement into and out of a house, help provide thermal comfort, reduce heat loss and avoid moisture condensation in the walls and ceilings that […]

Orientation of Studs

Orientation of Studs (1) Except as permitted in Sentences (2) and (3), all studs shall be placed at right angles to the wall face. (2) Studs on the flat are permitted to be used in gable ends of roofs that contain only unfinished space or in non-loadbearing interior walls within the limits described in Article […]

Polyethylene strips at end of partition and over wall top plates

Polyethylene strips at end of partition and over wall top plates It is common to install the ceiling air barrier before the interior partitions are built, because it is easier to make an airtight connection between the wall top plates and unconditioned spaces (such as attics). Alternatively, when the interior partitions are built before the […]

Protection of Cladding from Moisture

Protection of Cladding from Moisture (1) A clearance of not less than 200 mm shall be provided between finished ground and cladding that is adversely affected by moisture, such as untreated wood, plywood, OSB, waferboard and hardboard. (2) A clearance of not less than 50 mm shall be provided between a roof surface and cladding that is […]

Required Barrier to Air Leakage

Required Barrier to Air Leakage (1) Wall, ceiling and floor assemblies that separate conditioned spaces from unconditioned spaces or from the ground shall be constructed so as to include an air barrier system that will provide a continuous barrier to air leakage, (a) from the interior of the building into wall, floor, attic or roof […]