Residential service in Toronto and the GTA
Air Sealing
Seal accessible gaps and penetrations to reduce drafts, heat loss and uncontrolled air leakage.
What the attic is telling you
Signs you may need this
Weather usually gets blamed first. Escaping attic heat is often the real source.
- Cold air felt at the attic hatch
- Drafts around recessed lights
- Cold where the wall meets the ceiling
- Dust marks in the insulation where air moves through it
- Heating bills higher than the house should produce
- Ice at the roof edge in winter
Insulation slows heat.It does not stop air.
Air moving out through the ceiling carries more heat than most homeowners expect, and insulation laid over an open penetration does not stop it. Sealing the accessible openings in the attic floor comes first, which is also what makes the insulation above them perform the way its rating suggests.
Is this the right call for your home?
When it applies
- Drafts are felt at ceilings, hatches or penetrations
- An insulation top-up is planned
- Ice dams form at the roof edge
When something else comes first
- The drafts come from windows and doors, which is outside this scope
- The house has no accessible attic floor to work from
A house needs controlled air exchange. The objective is to stop uncontrolled leakage through the envelope, not to seal the house shut.
How the work runs
Our process
Locate the leakage
Hatch, penetrations, top plates and any path where air is moving.
Prepare the areas
Insulation pulled back where the sealing has to happen.
Seal
Accessible gaps and penetrations sealed with the appropriate material.
Restore coverage
Insulation replaced or brought back to target over the sealed areas.
Verify
The work is checked before the attic is closed up.
About this service
Questions we get on this one.
Specific to air sealing. Tap a question.
Eco-Therma
Usually replies the same day
Is air sealing more important than insulation?
Air sealing and insulation do different jobs. Sealing stops air from carrying heat out, insulation slows heat from passing through. In most attics sealing comes first.
Can a house be sealed too tightly?
A house needs controlled air exchange. The objective is to stop uncontrolled leakage through the envelope, not to eliminate ventilation.
A practical next step
Get a quote on air sealing.
Send your address and the approximate size of the space. We come back with a remote estimate and what still needs to be confirmed on site.
