If a blown-in insulation job goes in slightly unevenly, the fix is usually just adding more material. Spray foam doesn’t work that way. Two chemicals are combined at the spray gun tip and expand on contact — the ratio, temperature, and application thickness all have to be right in the moment. Unlike blown-in cellulose or fiberglass, foam can’t be topped up or evened out later without cutting it out first.
That’s the real argument for hiring an experienced spray foam insulation contractor instead of the lowest quote in your inbox: a poor spray foam job isn’t a cosmetic problem, it’s a redo.
Homeowners comparing quotes for attic insulation often assume all insulation installers are interchangeable. With spray foam specifically, technique and experience affect the outcome more directly than with blown-in or batt products, because of how the material cures on contact.
What a Spray Foam Insulation Contractor Actually Installs
Not all spray foam is the same product, and a contractor worth hiring should be able to explain the difference without prompting.
Open-cell (1/2 lb, low-density) foam — lighter, more flexible, expands significantly on application. Commonly used for interior walls, sound dampening, and attics where air sealing is the main goal and budget is a factor. Lower R-value per inch than closed-cell.
Closed-cell (2 lb, high-density) foam — denser, rigid, and creates a real moisture and vapour barrier at sufficient thickness. Higher R-value per inch. This is the standard choice for basements, crawlspaces, rim joists, and garage ceilings, where moisture control matters as much as R-value.
A cold room above an attached garage is one of the most common calls a spray foam insulation contractor gets in the GTA. The fix isn’t a surface patch — it’s removing the drywall and existing batt, then closed-cell spraying the cavity directly. Surface-level fixes don’t hold on this particular problem.
For a full cost breakdown by project type, see our spray foam insulation cost guide. For the full service list, see spray foam insulation.
Six Questions to Ask Before Hiring a Spray Foam Insulation Contractor
1. Which product are you using, and is it a recognized brand? Foam quality varies by manufacturer. A contractor who can’t name the product they’re spraying into your home is a red flag, not a small detail.
2. Open-cell or closed-cell — and why that one for my space? The right answer changes by application (interior wall vs. rim joist vs. garage ceiling). If a contractor recommends the same product for every space without asking what the space is for, that’s worth questioning.
3. Do I need to leave my home during installation? Ask directly and get the answer in writing before the job is booked, not on installation day.
4. Is the quote itemized — material, labour, square footage, and any prep or removal work? A phone estimate is a guess. A real quote requires an in-home inspection, and it should separate material, labour, and any drywall removal or prep as line items, not one lump sum.
5. Are you licensed and insured for this work in Ontario? Ask to see it, not just hear it.
6. Is this project eligible for a rebate, and who confirms that — you or the program? A trustworthy spray foam insulation contractor points you to verifying eligibility directly against the program — see Enbridge Home Renovation Savings and the Canada Greener Homes Loan — rather than quoting a rebate number as if it’s guaranteed. Program rules and dollar amounts change, so this guide intentionally doesn’t quote a figure here.
For the broader hiring checklist covering insulation contractors generally, see how to hire an insulation contractor.
What Sets Pro Insulation Contracting Apart
- Based at 185 Riviera Dr, Unit 11, Markham — not a satellite office
- Open Saturdays, 10AM–4PM
- Installs Insulthane Extreme by Elastochem for spray foam applications
- Offers both open-cell (1/2 lb) and closed-cell (2 lb) spray foam
- Also provides blown-in, batt, drywall, vapour barrier, garage ceiling insulation, and AeroBarrier air sealing — so a spray foam job that uncovers a related issue doesn’t require a second contractor
- Installs manufacturer-backed products, including Johns Manville, Owens Corning, and CertainTeed
Explore completed jobs in our portfolio, or compare spray foam against other attic options in the complete attic insulation guide.
Where We Install Spray Foam Insulation
Pro Insulation Contracting serves the GTA broadly, including Toronto, Markham, Richmond Hill, Vaughan, Woodbridge, Thornhill, Scarborough, North York, Etobicoke, Mississauga, Brampton, Aurora, and Barrie. Call (416) 315-0471 to confirm coverage for your address.
FAQ
How much does hiring a spray foam insulation contractor cost? It depends on square footage, open-cell vs. closed-cell, and whether prep or removal work is needed. See our spray foam insulation cost breakdown for the full picture — an accurate number still requires an in-home inspection.
Is spray foam better than blown-in insulation? Not universally better — different tool for a different job. Blown-in (cellulose or fiberglass) is typically more cost-effective for straightforward attics. Spray foam combines insulation and air sealing in one step, which tends to suit homes with drafts, complex rooflines, or moisture-control needs like garage ceilings and rim joists.
Do I need a licensed spray foam insulation contractor, or can this be a DIY job? Spray foam is not a practical DIY project — it requires mixing equipment and correct application technique, and a poor application generally has to be cut out and redone rather than corrected in place. This is the service where hiring a professional matters most.
Are there rebates available for spray foam insulation in Ontario? Possibly — availability, eligibility, and dollar amounts change over time and can differ by insulation type. Check current details directly against the Home Renovation Savings program or the Greener Homes Loan.
Do you serve my area? Pro Insulation Contracting serves the GTA broadly — see the service area list above, or call (416) 315-0471 to confirm coverage for your address.