Construction codes of Ontario

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Grade Marking (Lumber and Wood Products)

Grade Marking (1) Lumber for joists, rafters, trusses and beams and for the uses listed in Table 9.3.2.1. shall be identified by a grade stamp to indicate its grade as determined by the NLGA, “Standard Grading Rules for Canadian Lumber”. Article 9.3.2.1 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Heat Flow Control

Heat Flow Control All assemblies that separate the conditioned environment from the unconditioned environment, including attached garages, must be insulated. This includes roofs, walls, foundations, windows and doors. The 2012 Interim Changes to the 2010 NBC regulate the “effective” insulation value for each assembly or component of the building envelope for six different Canadian climate […]

Installation of Spray-Applied Polyurethane

Installation of Spray-Applied Polyurethane (1) Spray-applied polyurethane insulation shall be installed in accordance with CAN/ULC-S705.2, “Thermal Insulation – Spray-Applied Rigid Polyurethane Foam, Medium Density – Application”. Article 9.25.2.5. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Installation of Thermal Insulation

Installation of Thermal Insulation (1) Insulation shall be installed so that there is a reasonably uniform insulating value over the entire face of the insulated area. (2) Insulation shall be applied to the full width and length of the space between furring or framing. (3) Except where the insulation provides the principal resistance to air leakage, […]

Installation of Vapour Barriers

Installation of Vapour Barriers (1) Products installed to function as the vapour barrier shall protect the warm side of wall, ceiling and floor assemblies. (2) Where different products are used for the vapour barrier and the insulation, the vapour barrier shall be installed sufficiently close to the warm side of the insulation to prevent condensation at design […]

Insulating Concrete Form Foundations

Insulating Concrete Form Foundations Insulating concrete form (ICF) walls are concrete walls cast in polystyrene forms that remain in place after the concrete has cured (Figure 17). Most ICF walls are “flat” ICF walls, which means that the concrete is of uniform thickness over the width and height of the wall. The NBC requires that […]

Insulation of a Flat joist-type Roof Ceiling above the Sheathing

Insulation of a flat joist-type roof ceiling above the sheathing Another approach is to place the insulation above the sheathing, as is commonly done with low-slope roofs (Figure 27). Insulation exposed to the weather must be impermeable to moisture. Polystyrene insulation is commonly used on the outside of roof sheathing and protected by the roofing […]