Zone 7B Thermal Requirements

The climate zones are under the jurisdiction of provincial governments and may differ from those in the national model codes. When the harmonized system of the Canadian Model Building Code is adopted, provincial governments may choose to adopt or adapt the climate zones.

Thermal Requirements for Climate Zone 7B (No HRV)

Thermal Requirements for Climate Zone 7B with No HRV:

  • Cathedral Ceiling/Flat Roofs: Eff. RSI 5.02 (R28.5)
  • Exterior Walls: Eff. RSI 3.85 (R21.9)
  • Ceilings Below Attics: Eff. RSI 10.43 (R59.2)
  • Floors Over Unheated Spaces: Eff. RSI 5.02 (R28.5)
  • Foundation Wall: Eff. RSI 3.46 (R19.6)
  • Sub-Slab (Basement): Eff. RSI 3.72 (R21.1)
  • Slab on Grade with Integral Footing: Eff. RSI 3.72 (R21.1)

Thermal Requirements for Climate Zone 7B (With HRV)

Thermal Requirements for Climate Zone 7B With HRV:

  • Cathedral Ceiling/Flat Roofs: Eff. RSI 5.02 (R28.5)
  • Exterior Walls: Eff. RSI 3.08 (R17.5)
  • Ceilings Below Attics: Eff. RSI 10.43 (R59.2)
  • Floors Over Unheated Spaces: Eff. RSI 5.02 (R28.5)
  • Foundation Wall: Eff. RSI 2.98 (R16.9)
  • Sub-Slab (Basement): Eff. RSI 2.84 (R16.1)
  • Slab on Grade with Integral Footing: Eff. RSI 2.84 (R16.1)

This summary is offered for informational purposes only. It does not purport to be an exhaustive analysis of the Canadian codes or changes to the code or provide advice that will ensure guaranteed compliance with any energy or building code provision. Please consult with local authorities finalizing your installation plans.