Spray Foam Insulation, Toronto

Where spray foam is the right answer

Closed-cell spray foam is an air barrier, a vapour retarder and insulation in one pass, at roughly R–6 per inch. That combination is worth paying for in exactly the places where achieving those three things separately is difficult:

• Rim joists and headers — awkward geometry, and the biggest air leak in most basements.
• Cathedral ceilings and flat roofs with little or no ventilation space.
• Crawlspaces, where you are trying to bring the space inside the envelope.
• Overhangs and cantilevers, including the floor over a garage where access is open.

When this is the wrong answer

Spray foaming a standard vented attic floor is usually a waste of money: blown cellulose or fibreglass reaches the same R-value for a fraction of the cost, and the air sealing that foam is being sold for can be done with caulk and canned foam at the penetrations for very little. If someone has quoted you spray foam across an open attic floor, ask them to price the conventional assembly beside it.

What it does to the rebate

The programme pays on R-value achieved, not on material. Foam reaches the tier in fewer inches; it does not pay more for doing so.

Amounts are set by Enbridge Gas and Save on Energy and are quoted from the programme pages — attic stream, assessment stream — checked September 2026.

Common questions