Stop Heat Loss & Ice Dams at the Source
In a Thorold winter, the attic does more damage to your heating bill than any other part of the house. Warm air rises, finds the gaps around pot lights, the attic hatch and top plates, and leaks straight into a cold attic. That warm air melts the snow on your roof, which runs down and re-freezes at the cold eaves as an ice dam that backs water up under the shingles. Batts alone don't stop it because they don't air-seal. Spray foam does both jobs at once — sealing every gap as it builds R-value — so the heat stays in the living space where you paid for it.
What an Attic Spray Foam Job Includes
- Air-sealing — foaming the top plates, penetrations, hatch and bypasses that leak heat
- Open-cell or closed-cell foam — chosen for your attic depth and R-value target
- Hybrid systems — a flash coat of foam plus blown-in to hit R-60 economically
- Removal of wet or mouldy insulation — when the old batts or blown-in have to go first
- Ventilation check — baffles and intake/exhaust balance so the roof deck stays healthy
Built for Thorold's Cold & Snow
Two local realities decide how well an attic performs here. First, the cold: our heating season runs long, so every air leak you seal pays back month after month. Second, the snow load — lake-effect snow off Lake Erie and Lake Ontario piles it on the roof, and an under-insulated attic turns that snow into the meltwater that causes ice dams and leaks. A properly air-sealed and insulated attic is the single highest-impact upgrade for most older Thorold homes.
What Attic Spray Foam Costs in Thorold
Most attic projects land around $3,000–$7,000, depending on the size of the attic, whether you're going open-cell, closed-cell or a hybrid, and whether old, wet insulation has to be removed first. It's one of the upgrades most likely to qualify for federal or Ontario home-energy rebates — ask us which current programs apply. Your free quote gives the exact number once we see the attic.
Looking at other areas of the house? See our closed-cell foam and spray foam cost pages too.
Attic Spray Foam Thorold FAQ
Will attic spray foam stop ice dams on my Thorold roof?
It addresses the cause — heat leaking into a cold attic melts roof snow that re-freezes at the eaves. Air-sealing and insulating the attic keeps that heat in the house, so far less snow melts. Proper ventilation is part of the fix too.
How much does attic spray foam cost in Thorold?
Most attic projects land around $3,000–$7,000 depending on size, R-value target and whether old insulation comes out first. The free quote gives an exact number.
Do you remove the old attic insulation first?
Only if it's wet, mouldy or compacted. Dry, sound insulation can sometimes stay. We assess this on the quote visit.
What R-value should a Thorold attic have?
Ontario code targets about R-60 for attics in our climate zone. Closed-cell reaches high R-value in less depth; a foam-plus-blown-in hybrid is also common.