Spray Foam Insulation (Polyurethane) in Quebec | Toiture & Isolation Provinciale

Spray polyurethane foam is the highest-performing insulation for hard-to-treat areas: rim joists, crawl spaces, basements, flat roofs. Where other insulations let air through, it seals and insulates in a single pass.

Insulation and air barrier in one step

Sprayed polyurethane insulates and seals air at the same time. As it cures, it moulds to every recess, works around wires and pipes, and closes the air leaks that batts and blown insulation can't reach. The result: a continuous envelope, with no thermal bridging or infiltration.

R-6 per inch: performance in the tightest space

At roughly R-6 per inch, high-density polyurethane delivers one of the best R-values on the market — nearly double blown insulation at equal thickness. It's the go-to when space is tight: rim joists, foundation walls, cathedral ceilings. It also acts as an air and vapour barrier, often eliminating a step and a material.

Typical applications

Rim joists — one of a home's biggest air-leak sources, almost always left bare
Crawl spaces and basements — we dry it out, seal it, and reclaim a healthy space
Flat and cathedral roofs — where there's no room to ventilate a conventional attic
Foundation walls, damp or irregular areas — foam adheres and resists moisture

Residential and commercial alike

Single-family home, plex, commercial or multi-unit building: same product, same rigour. On large projects, spray foam speeds up the work — one application to insulate, seal and vapour-proof — and suits the demands of flat roofs and industrial envelopes.

Spray foam or blown insulation?

For an accessible attic, blown insulation (cellulose or fiberglass) to R-50 remains the best performance-for-price. Spray foam shines in the tough spots where blown can't hold or seal. Often the best solution combines both — and because we also do the roofing and ventilation, we recommend the right product in the right place, without selling you foam everywhere.

Certified application

Spray foam is unforgiving of improvisation: dosage of both components, product and substrate temperature, thickness per pass, cure time. Our certified installers (Isolatek and manufacturers) monitor these parameters continuously and meet the Building Code — including the requirement to cover foam with a compliant thermal barrier in living spaces.

What you get

A clear written quote, zone by zone — no guesswork foam
Certified installers and approved products
Thickness verified and documented with photos
An end-of-job report and a written warranty

An application that leaves nothing to chance

Spray foam demands rigour — here is how we work.

Targeted assessment

We identify the leak zones: rim joists, crawl space, foundation walls, cathedral ceilings. Every sprayed square foot has to earn its place.

Protecting the site

We mask and protect the surfaces around the application zone — spray foam doesn't forgive splatter.

Controlled application

Dosage, temperature and thickness monitored continuously by our certified installers. That's the difference between a high-performance product and a problem.

Verification & report

We measure the achieved thickness, document it with photos, and hand it all over — compliant, verifiable, guaranteed in writing.

Your spray foam questions

What R-value does spray foam achieve?

High-density polyurethane offers one of the highest R-values per inch on the market — about R-6 per inch — while also acting as an air and vapour barrier. That's why it wins where space is limited.

Is spray foam safe?

Yes, applied by the book: certified products, controlled dosage and temperature, trained and certified installers. We tell you the recommended re-occupancy delay for the treated area based on the product used.

Does spray foam need a thermal barrier?

Yes — the Building Code requires spray foam to be covered with a compliant thermal barrier (drywall or an approved fire-resistant product) in living spaces. We explain it clearly at the quote stage, not after the work.

Spray foam or blown insulation for my attic?

For an accessible attic, blown insulation (cellulose or fiberglass) is usually the best performance-for-price. Spray foam shines in the tough spots: rim joists, crawl spaces, cathedral ceilings, foundation walls. Often the right answer is a combination of both.

Why are rim joists so important?

They're one of a home's biggest air-leak sources — and almost always left bare at construction. A few inches of spray foam seals and insulates them in one step, with an immediate comfort gain on the ground floor.

Spray foam: performance where it counts