Service area · Lanaudière
Attic insulation in Joliette
In Joliette, 55.6% of homes were built before 1981, which may leave attics where several layers have been added. Isolation Cornerstone visits them for free, then sends a written quote.

From the mills of 1824 to today’s eight sectors
In 1824, the seigneurs, Barthélemy Joliette among them, had mills built along the L’Assomption River; the village was then called L’Industrie. Joliette-Sud, created in 1957, joined the city in 1966, and the city now has eight sectors, from Christ-Roi to the downtown core.
The housing stock follows that history: 26.2% of homes predate 1961 and 29.4% date from 1961 to 1980. We often find old yellowed batts there, thin and packed down between the joists. An older house can also hide vermiculite; if in doubt, leave it alone.
- 26.2% Before 1961
- 29.4% 1961 to 1980
- 22.4% 1981 to 2000
- 22% Since 2001
Single-detached houses: 30.4% · semi-detached or row houses: 5.4%
Share of the 10,570 private households, 2021 census (Statistics Canada). Our office on rue Lacordaire is 61.4 km away, about 51 minutes by car.
Plainly: LogisVert and apartment buildings
Joliette has 30.4% single-detached houses, 5.4% semi-detached or row houses, 11.2% duplexes and 52.1% apartments. If you live in an apartment or a duplex, LogisVert does not apply to you: the measure excludes condos, multiplexes and apartment buildings. If you own a house heated mainly with electricity, it may: the roof has to reach R-50 over its whole surface, the caulking is done along with it, and Hydro-Québec decides. Only 37% of the city’s households own their home.
FAQ
The questions we get the most
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- The icicles on the edge of my Joliette roof are thick. Could the attic be the cause?
- Yes, it could. When an attic is poorly insulated, snow melts on the roof and refreezes at the edge as an ice dam. Thick icicles, an upstairs bedroom that will not warm up or a stain on the ceiling point to it from below. Isolation Cornerstone checks on site, at the free visit.
- Blown-in fibreglass or batts: which is better in the attic?
- Blown-in fibreglass, at Isolation Cornerstone. It reaches the corners nobody can crawl into and forms an even layer from wall to wall, at R-51 minimum, with depth rulers left standing in it so you can read the depth yourself.
- 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.
Get your free quote
We come and look at your attic in Joliette: the visit is free, and a written quote follows, with no pressure.
Or call us at (438) 544-6512