Heat rises, which makes your attic the single largest source of heat loss in most homes. An under-insulated attic lets the warmth you're paying for escape straight through the roof in winter and lets summer heat pour in, forcing your heating and cooling system to work harder all year. Isolation Majeau provides professional attic and roof insulation for homeowners across Greater Montreal, Laval, the South Shore, Lanaudière, and the Laurentians, and it's one of the most popular and highest-return upgrades we install.
If your home struggles to hold a comfortable temperature year-round, a poorly insulated attic is often the biggest issue, letting conditioned air escape and forcing your furnace and air conditioner to run longer than they should.
Proper attic insulation can improve your energy efficiency and lower energy bills by a meaningful amount, keeps your home cooler in summer and warmer in winter, and is part of the prevention for one of Quebec's most common winter roofing problems: ice damming. When heat leaks unevenly into the attic, it melts snow on the roof that refreezes at the eaves, forming the ice dams and icicles that damage shingles and shorten the life of the roof. Good insulation and proper ventilation keep the roof deck at an even temperature and can prevent that cycle. Attic insulation isn't always the cause of ice damming, and isn't always the answer, but it's often part of it!
The right material depends on the roof. We specialize in three attic applications and match the solution to the structure.
Blown cellulose is the most popular form of attic insulation and what most standard sloped-roof attics in Quebec are insulated with. It's blown in to fill the attic floor evenly, settles into gaps that batts leave behind, and delivers excellent, cost-effective coverage when installed to the correct depth. Cellulose is also a strong choice for the sound dampening of ceilings below.
Spray foam is our recommendation for the trickier parts of a roof: cathedral ceilings, wall-to-roof joints, and tight or complex spaces where ventilation is difficult and standard insulation struggles. Cathedral ceilings in particular are often insulated with fibreglass batts, but the gaps that tend to form between the batts and the roof structure create thermal bridges that undermine performance. Closed-cell spray foam creates a hermetic seal, eliminates those bridges, and adds rigidity to the structure at the same time.
A well-insulated attic that isn't properly sealed and ventilated can create as many problems as it solves. As part of the work, our crews address the details that make or break an attic:
The goal simple: keep the temperature and airflow in the attic even and controlled, so the insulation can do its job and the roof lasts as long as it should.
Attic insulation is one of the most cost-effective improvements a homeowner can make, and because they deliver such a clear efficiency gain, they're among the projects most likely to qualify for government rebates through programs like Rénoclimat and LogisVert.
Isolation Majeau has been insulating homes across the Greater Montreal region for over 55 years, completing more than 4,000 insulation projects a year, mostly in the residential sector. We install quality cellulose, fibreglass, and spray foam products from leading manufacturers, backed by their warranties, and our experienced crews install them to the correct depth and coverage every time, with the ventilation and air sealing details handled properly. Attic work rewards experience, and it's a service we've refined over decades in Quebec's climate.
Get in touch with Isolation Majeau today to discuss your attic insulation project!
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