Attic Insulation in Toronto & the GTA

Half the housing stock in the GTA sits under R12 to R20 of tired insulation — a fraction of what current code expects of a new build. You feel it as cold bedrooms over the garage, a furnace that never rests in February, and a row of icicles that returns every winter. Of all the heat-loss fixes a house has, the attic is usually the cheapest per degree of comfort gained.

The order of operations matters more than the fluff. Attic air sealing comes first — top plates, plumbing chases, pot lights, the hatch — because warm air leaking upward carries more heat than conduction ever will. That same escaping heat is what melts roof snow from below and builds ice dams at the cold eaves. Then baffles go in at the soffits so the intake stays open, and blown-in insulation tops the attic up to R60.

We quote what your attic needs, not a one-size blow-in. Dry, clean existing insulation stays put and gets topped up; wet, mouldy or rodent-fouled material comes out first. And we'll be straight about the half-job problem: loose fill insulation dumped over unsealed air leaks looks great on an invoice and underperforms in a house.

• Air sealing of top plates, wiring and plumbing penetrations, pot light covers and the hatch — before any insulation goes in
• Baffles stapled into every eave bay so the soffit intake stays open
• Blown-in loose fill insulation (cellulose or fibreglass) topped up to R60
• Depth markers through the attic so the finished level is verifiable, not guessed
• An insulated, weatherstripped attic hatch — often the biggest single hole in the ceiling
• Removal of wet, compressed or contaminated old insulation where needed
• Proper clearance dams around chimneys, flues and heat-producing fixtures
• A check that every exhaust fan ducts outdoors, not into your fresh insulation

• Attic footprint and how much depth you're starting with — an attic insulation top up is a different job than a strip-out
• Air sealing scope: a ceiling full of pot lights takes real time to seal safely
• Whether old material has to be removed and bagged out first
• Access — hatch size and location decide how the hose gets in
• Roof pitch at the eaves; tight low heels make baffling slow, careful work
• Obstacles like attic HVAC equipment, storage decking, or knob-and-tube wiring that must be dealt with before blowing

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.