About
Isolation Cornerstone: the team and the method
What we do
We insulate attics, to R‑51 minimum. Around that, we fix what keeps the insulation from doing its job: mold on the roof deck, vermiculite to remove, ventilation under the roof. The caulking LogisVert asks for is done in the same project.
Service area
Montreal, Laval and around
Lanaudière, Laurentides, Montérégie: streets like this one, and under every roof, an attic we can come up and see. The visit and the quote are free.
What we do in every attic
The visit
Someone from the team goes up into the attic. We measure the depth of the insulation, look at the ventilation, the roof boards and the ducts, and look for vermiculite or mold before talking price.
The quote
Written and free, with the LogisVert conditions gone over with you. No pressure, even if you choose another contractor.
The work
The house is protected with tarps and shoe covers. Before insulating, we seal the ceiling’s air leaks, install a baffle at every soffit and protect the chimney, light fixtures and ducts as the code requires. The bathroom, range hood and dryer fans are vented outside, and the hatch is insulated with weatherstripping.
Only then do we blow in the insulation. Then we clean up.
The team
In the photo, that’s Timothé, in the company hoodie. In the reviews, what customers remember about the team comes back from one review to the next: on time, house left clean, time taken to explain the work.
What customers say
5.0 on Google, 48 reviews, all five stars (as of November 11, 2026).
“We had the isolation redone in our attic along with the caulk around the windows and doors in May2025. The team was excellent to deal with and kept everything clean and tidy in the process. Once completed we immediately noticed the house felt and sounded quieter.”
“Professional, attentive to details, and always ready to answer questions. Don’t look any further! Highly recommend!”
“Amazing service from beginning to end highly recommend !”
Reach us
6319 Lacordaire Street, Montreal, Quebec H1T 2J9Monday to Friday, 8 a.m. to 7 p.m., Saturday, 9 a.m. to 2 p.m.(438) 544-6512 · info@isolationcornerstone.comWe’ll come up and see your attic
The visit and the quote are free.