Canada — Home Energy
Insulation & Energy Efficiency Reference
Technical details on insulation materials, R-value requirements, air sealing strategies, and retrofit options for Canadian homes across climate zones.
Technical details on insulation materials, R-value requirements, air sealing strategies, and retrofit options for Canadian homes across climate zones.
Canada's National Building Code sets minimum thermal resistance requirements that vary significantly from British Columbia to Nunavut. Understanding how insulation types, R-values, and installation quality interact is central to achieving code compliance and reducing energy bills.
From fiberglass batts to spray polyurethane foam (SPF), each material carries a specific R-value per inch and a distinct installation method. Mineral wool, cellulose, and rigid foam boards are common in retrofit projects across Canada.
R-value measures thermal resistance. The NBC 2020 specifies R-24 to R-60 for attics depending on climate zone. Higher R-values reduce heat transfer, but the total system performance also depends on installation continuity and air sealing.
Heat loss through air leakage can account for 25–40% of a home's space-conditioning load. Blower-door testing identifies infiltration points; caulking, foam gaskets, and intumescent sealants are used at penetrations, junctions, and service entries.
R-value tables, zone-by-zone requirements from the NBC, and how material choice affects whole-assembly performance.
Read article →
Blower-door diagnostics, priority air sealing locations, and material selection for cold-climate air barrier systems.
Read article →
Comparing dense-pack cellulose, blown mineral wool, and exterior continuous insulation for pre-1990 housing stock in Canada.
Read article →Canada spans eight climate zones under the NBC framework. Requirements differ substantially between Vancouver (Zone 4) and Winnipeg (Zone 7A), affecting minimum R-values for walls, attics, and below-grade assemblies.
Most Canadian cities exceed 4,000 heating degree days annually. This figure directly drives the economic case for higher insulation levels — payback periods for above-code insulation are shorter in colder regions. Edmonton and Saskatoon regularly surpass 5,500 HDD, making thermal continuity critical.
Cold-climate wall assemblies must manage vapour diffusion and condensation risk. The location of the vapour barrier — typically a 6-mil polyethylene sheet — follows NBC Part 9 guidance. In mixed-humid zones, smart vapour retarders can allow drying in both directions, reducing mould risk.