A more comfortable home thanks to a well-insulated attic in Joliette, QC

Tuesday, February 17th, 2026 by Vanessa Nehme

Challenge

Our customer in Joliette noticed an increase in heating costs, temperature variations between rooms, and difficulty heating the house in winter, signs that a significant amount of heat was escaping through the attic. The old insulation had sagged and no longer provided sufficient thermal resistance to retain heat, and air leaks into the uninsulated space further exacerbated energy losses. This situation affected not only the thermal comfort of the residence, but also its overall energy efficiency, causing the heating system to work harder than it should.

Solution

To remedy these problems and improve the building's energy efficiency in a sustainable manner, we took a comprehensive approach:

We began by removing the old insulation, which had become ineffective, in order to eliminate any compressed or degraded material.
We sealed air leaks, including joints and air passages around light fixtures and ducts, to improve the attic's airtightness, a crucial step in energy optimization best practices.
We also installed an insulated and airtight access hatch, a recommended solution for even more effective prevention of heat loss through the attic access.
Finally, we installed a new layer of blown TruSoft cellulose, an insulation material that achieves a higher R-value, promoting heat retention and limiting heat transfer to uninhabited spaces.

Thanks to this work, the attic of the house is now well insulated and airtight, which has significantly reduced heat loss and thermal bridges and resulted in a more stable indoor temperature throughout the year.