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Table 11 Effective thermal resistance of assemblies in buildings with a heat-recovery ventilator Heating degree-days of building location,1 in celsius degree-days Zone 4 Zone 5 Zone 6 Zone 7A Zone 7B Zone 8 <3000 3000 - 3999 4000 - 4999 5000 - 5999 6000 - 6999 >7000 Vancouver, Kamloops, Prince Calgary, AB Cold Lake, NWT and BC BC Rupert, BC Regina, SK AB Nunavut Kelowna, BC Lethbridge, Winnipeg, Whitehorse, Toronto, ON BC MB YK Ottawa, ON Quebec City, Montreal, QC QC Edmundston, Halifax, NS NB Minimum Effective Thermal Resistance RSI m2•K/W (R ft2•˚F•h/Btu) Building assembly above ground Ceilings 10.43 6.91 (39.2) 6.91 (39.2) 8.67 (49.2) 8.67 (49.2) 10.43 (59.22) below attics (59.22) Cathedral ceilings and 4.67 (26.5) 4.67 (26.5) 4.67 (26.5) 5.02 (28.5) 5.02 (28.5) 5.02 (28.5) flat roofs Walls2 2.78 (15.8) 2.97 (16.9) 2.97 (16.9) 2.97 (16.9) 3.08 (17.5) 3.08 (17.5) Floors over unheated 4.67 (26.5) 4.67 (26.5) 4.67 (26.5) 5.02 (28.5) 5.02 (28.5) 5.02 (28.5) spaces Building assembly below grade or in contact with the ground1 Foundation 1.99 (11.3) 2.98 (16.9) 2.98 (16.9) 2.98 (16.9) 2.98 (16.9) 2.98 (16.9) walls Unheated floors3 • below frost Uninsulated Uninsulated Uninsulated Uninsulated Uninsulated Uninsulated 4, 5 line 1.96 (11.1) 1.96 (11.1) 1.96 (11.1) 1.96 (11.1) 1.96 (11.1) 1.96 (11.1) • above frost line5 Heated and unheated floors n/a n/a n/a n/a 4.44 (25.2) 4.44 (25.2) on permafrost Heated floors6 2.32 (13.2) 2.32 (13.2) 2.32 (13.2) 2.84 (16.1) 2.84 (16.1) 2.84 (16.1) Slabs-on-grade with an integral 1.96 (11.1) 1.96 (11.1) 1.96 (11.1) 2.84 (16.1) 2.84 (16.1) 3.72 (21.1) 6 footing Climate Zone Heating-degree days Typical Locations
Notes to Table 11 1. See NBC 1.1.3.1. 2. See NBC 9.36.2.8.(3) for requirements concerning the above-ground portion of foundation walls. 3. Does not apply to below-grade floors over heated crawl spaces. 4. Typically applies to floors-on-ground in full-height basements. 5. Refers to undisturbed frost line before house is constructed. 6. See NBC 9.25.2.3.(5) for requirement on placement of insulation. The design of slabs-on-grade with an integral footing is addressed in NBC Part 4 (see Article 9.16.1.2.).