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Table 13 Required thermal characteristics of windows, doors and skylights
Zone 4 <3000
Zone 5 3000 - 3999
Zone 6 4000 - 4999
Zone 7A 5000 - 5999
Zone 7B 6000 - 6999
Zone 8 >7000
Typical Locations
Vancouver, BC
Kamloops, BC Kelowna, BC Toronto, ON
Prince Rupert, BC Lethbridge, BC Ottawa, ON Montreal, QC Halifax, NS
Calgary, AB Regina, SK Winnipeg, MB Quebec City, QC Edmundston, NB
Cold Lake, AB Whitehorse, YK
NWT and Nunavut
Thermal Characteristics
Heating degree-days of building location,1 in celsius degree-days
Climate Zone Heating-degree days
Maximum U-value, W/(m2•K) 1.60
1.60
1.40
1.40
25
25
29
29
2.40
2.40
Windows and Doors2
1.80
Minimum Energy Rating 21
Skylights
1.80
21
Maximum Overall Thermal Transmittance 2.90
2.90
2.70
2.70
Notes to Table 13 1. See NBC 1.1.3.1. 2. Except skylights and glass block assemblies