R-40 to R-60 are attic targets. Wall cavities hold far less insulation, so wall and basement results are rough planning figures.
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How to Use the Insulation Cost Calculator
Choose attic, exterior walls, or basement and rim joist, since each has a different typical cost and heating savings impact.
Choose blown-in, batt, or spray foam insulation based on the application and whether air sealing is also needed.
Choose the target R-value and enter the square footage of the area being insulated.
Click Calculate Cost to see material and labour cost plus estimated annual heating savings.
What Drives Insulation Upgrade Cost
Insulation cost scales with the area being covered, the material type used, and the target R-value, which determines how thick or dense the finished insulation layer needs to be. Attic insulation is typically the most cost-effective upgrade per dollar spent, since heat naturally rises and attics are usually the easiest area to access for installation. At the default 1,200 square feet of blown-in attic insulation to R-50, this calculator returns $2,640, or $2.20 per square foot.
Comparing Insulation Types
Blown-in insulation is a common, cost-effective choice for attics, filling irregular spaces around joists and obstructions well. Batt or roll insulation works well in accessible, regularly-shaped spaces like exterior wall cavities during a renovation, though it can leave gaps around obstructions if not installed carefully. Spray foam costs considerably more per square foot, $4.80 against $2.20 for blown-in and $1.80 for batt in this calculator, but creates an air barrier at the same time it insulates, which the other two types don't provide on their own. On the same 1,200 square feet that is $5,760 for spray foam against $2,640 for blown-in.
Why Air Sealing Matters as Much as R-Value
A high R-value slows heat transfer through the insulation material itself, but it doesn't stop air from leaking through gaps, cracks, and penetrations around the insulated area. A well-insulated but poorly air-sealed attic can still lose significant heat through air leakage, and the air leakage calculator shows how much that can add up to. This is part of why spray foam's air-sealing property can offer real value in areas with known air leakage problems, even at a higher cost per square foot, and the calculator credits spray foam with 25 percent more savings for that reason.
Canadian R-Value Targets
Targets vary by province. The Government of Québec says attic insulation should reach R-50 or more, while Alberta's edition of the National Building Code calls for RSI 10.43 (R-60) in ceilings below attics and RSI 3.08 (R-22) in wall cavities. That is a meaningful step up from the R-20 to R-30 levels common in older homes built to older standards. The R-40, R-50, and R-60 choices here are attic targets, so wall and rim joist results are rough planning figures, since a wall cavity can't hold that much insulation. The right target for a specific home depends on its climate zone and existing insulation condition.
How the Savings Estimate Works
The savings figure uses a flat allowance per square foot, calibrated so a 1,200 square foot attic saves about $336 a year, roughly 15 percent of a $2,200 annual energy bill. That lines up with ENERGY STAR's estimate that combined air sealing and insulation saves an average of 15 percent on heating and cooling costs, and its methodology table puts total-house savings at 14 to 16 percent in the coldest climate zones. On those numbers the default $2,640 attic job pays back in about 7.9 years, so treat the result as a planning estimate rather than a promise for any one house.
Checking for Available Rebates
Insulation upgrades are commonly eligible for federal and provincial energy efficiency rebate programs, often among the more straightforward upgrades these programs fund, though the federal Greener Homes Grant is now closed. Check the utility rebate calculator before finalizing a project budget, compare this cost against the energy retrofit cost calculator if insulation is part of a larger retrofit project, and test the payback with the insulation ROI calculator.
Frequently Asked Questions
Blown-in attic insulation typically costs somewhere in the range of $1.50 to $3.50 per square foot installed depending on the target R-value and existing insulation depth, while a typical attic top-up project often lands in the $1,500 to $4,000 range for an average home. In this calculator 1,200 square feet of blown-in insulation to R-50 comes to $2,640. Spray foam costs considerably more per square foot but adds air sealing benefits that blown-in insulation doesn't provide on its own.
Targets vary by province. The Government of Québec says attic insulation should reach R-50 or more, and Alberta's edition of the National Building Code calls for R-60 in ceilings below attics, which is meaningfully higher than the R-20 to R-30 levels common in older homes. The right target depends on the specific climate zone, with colder regions generally warranting the higher end of that range.
Spray foam costs considerably more per square foot than blown-in or batt insulation, but it also acts as an air barrier, sealing gaps and cracks that other insulation types don't address on their own. Whether the added cost is worth it depends on how much air leakage is a problem in the specific area being insulated, since spray foam's air-sealing benefit doesn't matter much in an area that's already well air-sealed.
Insulation upgrades are commonly eligible for federal and provincial energy efficiency rebate programs in Canada, often as one of the more straightforward and cost-effective upgrades a rebate program will fund, although the federal Greener Homes Grant is now closed to new applications. Eligibility and rebate amounts vary by program and province, so it's worth checking current available incentives before finalizing a project budget.
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