Service area · Montérégie
Attic insulation in Salaberry-de-Valleyfield
A stain on the ceiling of an upstairs bedroom in Salaberry-de-Valleyfield can come from a poorly insulated attic: 28.2% of the city’s homes predate 1961, and their insulation may have worn out. Isolation Cornerstone makes the visit for free, then sends a written quote.
What the ceiling shows before the attic does
From below, a poorly performing attic shows up as an upstairs bedroom that stays cold or as thick icicles along the roof edge. When the insulation is thin, packed down or uneven, heat passes through. Warm air leaking through the ceiling brings moisture. The heat that gets through also melts the snow on the roof, which refreezes at the edge as an ice dam, and vapour condenses on the roof deck, where mould settles on the wood.
The ceiling air leaks are sealed first; wood blocks plugging a soffit are removed, a baffle goes in so air can enter under the roof, then the insulation is blown in. Ventilation is part of the job.
- 28.2% Before 1961
- 33.3% 1961 to 1980
- 19.7% 1981 to 2000
- 18.9% Since 2001
Single-detached houses: 45.6% · semi-detached or row houses: 8.2%
Share of the 20,075 private households, 2021 census (Statistics Canada). Our office on rue Lacordaire is 71.6 km away, about 64 minutes by car.
Grande-Île and Saint-Timothée, merged in 2002
Valleyfield took its present shape in 2002, when the city joined Grande-Île and Saint-Timothée. A paper mill had set up there as early as 1854. With 28.2% of homes from before 1961 and 33.3% from 1961 to 1980, attics more than forty-five years old are the rule.
Duplexes make up 13.3% of homes: LogisVert does not apply to them.
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- Icicles hang from my roof edge in Valleyfield. Is it better to add insulation or to seal the air leaks first?
- Air leaks first, then insulation. Warm air rising through the ceiling melts the snow, which refreezes at the roof edge as an ice dam; on the job, the insulation is blown in last.
- LogisVert vs. Rénoclimat: which one applies to attic insulation?
- LogisVert, from Hydro-Québec, covers roof insulation done together with caulking, in a house heated mainly with electricity. Rénoclimat, from the Québec government, requires an energy evaluation before and after the work, and can complement LogisVert when the work is separate. Each programme alone decides whether you qualify.
- I think there is vermiculite in my attic. What should I do?
- Leave it alone, and don’t go up to check. Vermiculite can contain asbestos, according to Health Canada. Describe to Isolation Cornerstone what you saw, even from a distance: the crew comes to look at it, and it comes out before any insulation goes in.
Near Salaberry-de-Valleyfield
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We come and look at your attic in Salaberry-de-Valleyfield: the visit is free, and a written quote follows, with no pressure.
Or call us at (438) 544-6512