Professional attic and roof insulation installation and upgrades for residential properties in Greater Montreal. Reduce energy costs, prevent ice dams, and improve comfort.
Attic insulation is a critical component of your home's energy envelope and plays a direct role in roof performance during Quebec winters. Inadequate insulation allows heat from the living space to escape into the attic, which wastes energy, creates uncomfortable temperature variations inside the home, and contributes to ice dam formation on the roof. Upgrading attic insulation is one of the highest-return energy improvements a Quebec homeowner can make.
The Quebec building code sets minimum insulation requirements for residential attics, measured in RSI (thermal resistance) values. Current code for new construction requires substantially more insulation than what was standard even a few decades ago, which means many older Montreal homes are significantly under-insulated by today's standards. Our insulation services bring older homes up to or beyond current code levels, improving comfort and reducing heating costs.
We work with several insulation types depending on the attic configuration and project requirements. Blown-in cellulose and fiberglass are the most common choices for open attic spaces. Cellulose is made from recycled paper fiber treated with fire retardant and provides excellent thermal and acoustic performance. It settles into gaps and irregular spaces better than batt insulation, creating a more complete thermal barrier. For cathedral ceilings, knee walls, and spaces where spray foam is more appropriate, we install closed-cell or open-cell spray polyurethane foam that provides both insulation and air sealing in a single application.
Proper insulation installation requires attention to air sealing as well. Before adding insulation, we seal gaps around electrical boxes, plumbing penetrations, duct boots, attic hatches, and other openings that allow warm air to leak from the living space into the attic. Air leakage is responsible for a significant portion of heat loss in most homes, and sealing these leaks before insulating dramatically improves the effectiveness of the insulation. We also ensure that ventilation channels from the soffits remain clear after insulation is installed, using rafter baffles where needed to maintain proper airflow above the insulation layer.
Why this service
Reduces heating and cooling energy costs
Prevents ice dam formation by keeping attic cold
Improves indoor comfort and temperature consistency
Air sealing included to stop warm air leakage
Multiple insulation types for different applications
Brings older homes up to current code levels
FAQ for this service
Current Quebec building code requires attic insulation of approximately R-60 (RSI 10.6) for new construction. Many older homes have R-20 to R-30 or less. We measure your existing insulation depth and R-value, then recommend the amount needed to reach current standards or your desired performance level.
For most open attic spaces, blown-in cellulose or fiberglass provides the best combination of performance, coverage, and cost. Cellulose is slightly better at filling irregular spaces and offers good acoustic properties. For cathedral ceilings and tight spaces, spray foam is often the best choice.
Insulation works together with ventilation and air sealing to prevent ice dams. Adding insulation reduces heat transfer from the living space to the attic, which keeps the roof deck colder and prevents the uneven snowmelt that causes ice dams. For best results, combine insulation with proper air sealing and ventilation.
Most residential attic insulation projects are completed in one day. Blown-in insulation is applied quickly with specialized equipment. If significant air sealing work is needed first, the project may take a day and a half. Spray foam applications also typically take one day for residential attics.
In most cases, yes. New insulation can be added over existing insulation as long as the existing material is dry, not contaminated with mold or pests, and not blocking ventilation pathways. We inspect existing insulation condition before adding new material and address any issues found.