Signs Your Attic Insulation Has Failed
The clearest indicators are a heating bill rising year over year without a rate change, rooms that never hold temperature, snow melting off your roof faster than your neighbours', and insulation you can see that is thin, uneven or compacted. Any one of them justifies an inspection; three together usually means the attic has never been properly reworked.
What you can check yourself
Open the attic hatch and look across the surface. If you can see the top of the ceiling joists, you are almost certainly under R-30 — joists are typically 8 to 10 inches deep and R-60 sits well above them.
Look for grey or dark patches in light-coloured insulation. That discolouration is dust drawn through the material by moving air, and it marks exactly where the air leaks are.
What needs measuring
Depth alone does not tell you the R-value, because settled cellulose and loose fibreglass perform differently at the same thickness. We record material and depth together.
Air leakage is the part homeowners cannot assess visually. Top plates, plumbing stacks, chimney chases and pot lights are the usual paths, and they are why two attics at the same depth can perform very differently.
Symptom to likely cause
| Symptom | Likely cause |
|---|---|
| Bill rising year over year | Settled or insufficient insulation |
| Cold bedrooms upstairs in winter | Attic depth and air leakage |
| Hot upstairs rooms in summer | Same cause — the attic works both ways |
| Snow melts fast on your roof | Heat escaping into the attic |
| Ceiling joists visible from the hatch | Under R-30, likely original |
| Grey streaks in the insulation | Air leaking through that spot |
Follow-up questions
Can insulation just wear out?
It settles and compresses, and it stops working where it gets wet or displaced. The material itself does not expire.
Is a thermal camera necessary?
It helps, but a careful physical inspection finds most of it. We do not charge for the assessment either way.
General guidance for homes in the Greater Toronto Area. Every building is different — treat this as background, not as a specification for your project.
Want this checked on your own house?
The assessment is free and there is no obligation. You get the findings explained on site and the quote in writing afterwards.
Free assessment