London • Byron • Old South • Masonville • Lambeth • St. Thomas
Spray Foam Insulation for London, Ontario Homes
London's Climate Zone 6 winters demand more than fibreglass batt. Spray foam seals gaps, eliminates air infiltration, and gives you measurable energy savings — backed by Enbridge HER+ rebates for eligible projects.
Spray Foam vs. Fibreglass Batt — Why It Matters in London
London sits in Climate Zone 6. Winter temperatures regularly hit -15°C to -20°C. Here's how insulation choices play out over time.
Fibreglass Batt Insulation
- R-value degrades when compressed
- Doesn't seal air gaps — just fills space
- Can absorb moisture, lose effectiveness
- Sags over 20–30 years in walls and attics
- Doesn't stop air infiltration — just slows conduction
Spray Foam Insulation
- R-6 to R-7/inch (closed cell) — high value per thickness
- Seals air gaps as it expands — stops infiltration
- Vapour retarder function built in (closed cell)
- Permanent — no sagging, settling, or degrading
- Adds structural rigidity to framing
Spray Foam Applications for London Homes
Each application has a different ROI profile. We recommend the right one for your home's age, construction, and budget.
Rim Joist Sealing
The highest ROI application in most London homes. Rim joists — the wood framing at the top of your foundation walls — account for a disproportionate share of heat loss. Closed cell spray foam seals the air gap and provides R-20 to R-30 in a single pass. London's older homes in Wortley, Old East, and south London typically have uninsulated or poorly insulated rim joists.
Basement Wall Insulation
2–3 inches of closed cell foam on basement walls creates a thermal break, addresses moisture-driven condensation, and delivers R-12 to R-21. Eligible for Enbridge HER+ rebates and Greener Homes Loan financing.
Attic Air Sealing & Insulation
Open cell foam in attic framing bays seals ceiling penetrations and provides airtight insulation in one pass. Particularly effective for older London homes with many electrical penetrations, pot lights, and plumbing stack vents that batt insulation can't seal around.
Exterior Wall Cavities
Retrofit exterior wall insulation via drill-and-fill or open wall applications during renovations. Particularly valuable for London's pre-1960s housing stock with no wall insulation whatsoever.
Detached Garage Insulation
Spray foam for detached garages used as workshops, home gyms, or EV charging spaces. Closed cell for walls and roof deck — creates a conditioned space in London's winter without the moisture problems of batt insulation in an unheated structure.
New Construction & Commercial
Spray foam as the primary insulation and air barrier in new builds — eliminating the need for separate housewrap and vapour barrier in many assemblies. Commercial and industrial applications available throughout the London area.
How the Process Works
From first call to finished insulation — clear steps, no surprises.
Free On-Site Assessment
We visit your London home and assess the areas you want insulated — or recommend the highest-ROI applications if you're not sure where to start. No commitment required for the assessment.
Written Quote & Rebate Check
You receive a firm, itemized quote. We check your rebate eligibility (Enbridge HER+, Greener Homes Loan) at no charge and walk you through what you'll need to apply.
Installation Day
The work crew arrives with the spray foam rig. Most residential jobs take 1–2 days. We protect finished surfaces, ventilate properly during application, and clean up when done.
Rebate Documentation
We provide the product specs, installation details, and R-value documentation your rebate application requires. Most London homeowners complete Enbridge HER+ claims within 30 days of installation.
Common Questions About Spray Foam Insulation in London
- What is the difference between open cell and closed cell spray foam?
- Closed cell foam is denser (R-6 to R-7 per inch), acts as a vapour retarder, and is preferred for rim joists, exterior walls, and moisture-prone areas in London homes. Open cell foam is softer, less expensive, and ideal for interior walls and attics where vapour management is handled separately. We recommend the right type for each application.
- How much does spray foam insulation cost in London, Ontario?
- Typical London projects range from $600–$1,500 for rim joist sealing, $800–$2,000 for attic air sealing, $3,000–$8,000 for full basement walls, and $4,000–$12,000+ for full attic spray foam. Firm quotes provided before any work begins — no surprises.
- Does spray foam insulation qualify for Ontario rebates?
- Yes. Enbridge's Home Efficiency Rebate Plus (HER+) and the Canada Greener Homes Loan both include spray foam applications. Eligible projects at rim joists and basement walls qualify for cash rebates or interest-free financing. We check your eligibility at no charge.
- Where is spray foam most effective in a London home?
- Rim joists are the highest ROI application in most London homes — particularly older homes in Wortley Village, Old East Village, and south London. Basement walls and attic air sealing are also high-impact for homes built before 1980.
- How long does spray foam insulation last?
- Spray foam is a permanent solution — it does not sag, settle, or degrade like fibreglass batt over time. Properly installed closed cell foam can last the lifetime of the building (50+ years) and adds structural rigidity to framing.
Spray Foam Cost Ranges for London Homes
Prices vary by application type, home size, and site conditions. These ranges are typical for the London area.
Rim Joist Sealing
For a typical London bungalow or two-storey. Closed cell foam, 2–3 inch application. Highest ROI of any insulation upgrade.
Basement Walls
2–3 inches closed cell on full basement walls. Includes thermal break and vapour management. Rebate-eligible.
Attic Air Sealing
Open cell foam on attic floor framing and penetrations. Significant reduction in air infiltration for London's older homes.
Full Attic Spray Foam
Converting to a conditioned attic assembly with closed cell foam on the roof deck. Common for new construction and deep energy retrofits.
All pricing estimates. Firm quotes provided after on-site assessment.
Serving London & Surrounding Communities
We service London and the broader Middlesex and Elgin County area. Spray foam rigs travel — we cover a wide territory from London as our base.
Spray Foam Resources for London Homeowners
Guides to help you decide where to insulate and what to expect.
Spray Foam Insulation Cost in London, Ontario (2026)
Full cost breakdown by application — rim joists, basement walls, attic — plus Ontario rebates and payback periods.
Read more →Spray Foam vs Blown-In Insulation — London Homes Guide
Full comparison for London's older housing stock — R-values, air sealing, moisture control, cost, and where each product wins by application type.
Read more →Ontario Insulation Rebates 2026 — What London Homeowners Can Claim
Active programs for London — Enbridge HER+, Greener Homes Loan, Ontario Renovates. What spray foam qualifies for and how to stack programs.
Read more →Get Your Free Spray Foam Quote
Tell us about your London home and what you'd like to insulate. We'll give you a firm quote and check your rebate eligibility at no charge.
- ✓ Free on-site assessment
- ✓ Firm, itemized written quote
- ✓ Rebate eligibility check included
- ✓ No obligation to proceed
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