About 39 percent of Leduc homes were built before 1991. If your budget covers exactly one insulation job this year, this page is about which one it should be - because the difference between the best and worst use of the same money is large, and it is not the one most people pick. Residential spray foam insulation in Leduc gives its best return on one specific job, and it is not the one most people ask for.
Most people pick the attic. Usually it should not be first.
Attic insulation is the job everyone knows about, and adding depth to an attic is easy to sell. But in most Alberta houses the attic is not where the money is lost - it is lost through the penetrations in the ceiling below it, and through the rim joist at the other end of the building. Heat leaves as moving air through gaps far more than it leaks by conduction through insulation. Adding a foot of anything on top of an unsealed ceiling plane leaves the actual leak untouched.
The one job, if there is only one
The rim joist. It is a continuous unsealed band running the entire perimeter of the house where the floor structure meets the foundation. The area is small, so the cost is low. It is reachable from an unfinished basement, so the labour is short. And it sits at the exact height where cold air is pushed in during a cold snap, so the comfort change on the main floor is immediate and obvious.
If there is budget for two
Add the attic ceiling plane - sealing the pot lights, top plates, bath fans and plumbing stacks where they pass through. Still not depth; sealing. Depth is the third job, and by then it is usually worth doing with the cheaper foam because headroom in an attic costs nothing.
If you are finishing a basement anyway
That changes the ranking, because the wall is open and will never be this accessible again. Closed-cell against the concrete is the correct call below grade - moisture-resistant, R-6 to R-7 per inch, and a vapour retarder at about 38 mm. Two inches is roughly R-12 to R-14; three to four reaches R-18 to R-28 where the cavity allows.
What to ask for in writing
Thickness per assembly, the product per assembly, and what covering is included. Foam facing occupied space needs a thermal barrier - normally 12.7 mm drywall - and that is a real cost that belongs in the quote rather than after it.
When in the year to do it
Foam is sensitive to the conditions it goes on to - substrate temperature in particular - and a surface that is too cold can cause adhesion problems or shrinkage later. That is manageable in winter with a heated space, and it is simply easier in spring or autumn. If the work is discretionary rather than urgent, the shoulder seasons usually get you a crew with more time and conditions that need less management.
Residential Spray Foam Insulation Leduc: Common Questions
If I can only do one job, which? The rim joist. It is a continuous unsealed band around the whole house, small in area, and the main floor feels different immediately.
Why not start with the attic? Because heat mostly leaves as air through the ceiling penetrations rather than by conduction through insulation. Depth over an unsealed ceiling leaves the leak untouched.
When does the basement jump the queue? When it is being finished anyway. The wall is open and will never be that accessible again.
Plan with the spray foam calculator, see what moves the price, or get a free Leduc quote.