Upgrading your insulation is one of the best options to significantly reduce heating and cooling costs, because insulation slows or stops the rate of heat transfer. The R-value rating of insulation refers its thermal resistance. The insulation, along with other building materials in the assembly makes up the overall effective R-value of the roof or wall system. Buildings with very little insulation, or low effective R-value, may find the heating and ventilation equipment is being overworked.

If you are planning building renovations, upgrade your roof or wall insulation to Power Smart levels to take advantage of financial incentives (PDF, 485 KB). Our Building Envelope Program offers financial incentives that help cover up to 100 per cent of the insulation material cost, depending on your project.

Eligible projects include surface roof upgrades with R-25 to R30 effective, cavity roof upgrades with R-40 to R-50 effective, and surface wall and cavity wall upgrades with R-17 to R-20 effective. Eligible projects receive the following incentive factors:

  • Roof
    • Surface insulation incentive factor (R-25 to R-30 effective required) = 7.5¢/R/f2;
    • Cavity insulation incentive factor (R-40 to R-50 effective required) = 3.0¢/R/f2.
  • Wall
    • Surface insulation incentive factor (R-17 to R-20 effective required) = 7.5¢/R/ft2;
    • Cavity insulation incentive factor (R-17 to R-20 effective required) = 4.0¢/R/ft 2.

Nominal vs. effective R-value

When you participate in the Building Envelope Program, the R-value of all the components of a roof or wall assembly layers, the effective R-value, is taken into consideration, and not just the nominal R-value which is the R-value of only the insulation material.