Attic Insulation in Toronto
Your attic is where up to 40% of your home's heat escapes. Spray foam insulation air-seals and insulates in one step—stopping ice dams, cutting energy bills, and keeping every floor comfortable year-round.
Signs Your Toronto Attic Needs Insulation
Many Toronto homes—especially century homes in Leslieville, The Beaches, and Rosedale built before 1990—have inadequate attic insulation. Here's how to tell.
Ice Dams in Winter
Icicles hanging from your eaves mean heat is escaping through the attic and melting rooftop snow. This freeze-thaw cycle damages shingles, gutters, and causes interior leaks.
Uneven Temperatures
Third floor is sweltering in summer and freezing in winter while the main floor is fine? That's your attic failing to contain conditioned air—common in Toronto's multi-storey homes.
High Energy Bills
If your heating costs keep climbing despite a functioning furnace, air leakage through the attic is likely the culprit. It's the #1 source of heat loss in most homes.
Moisture or Mould
Condensation in the attic, damp rafters, or visible mould growth indicate warm humid air from your home is reaching the cold attic space. Spray foam stops this.
Drafts & Cold Spots
Feel cold air near light fixtures, attic hatches, or recessed lights on the top floor? These are air leakage points that only spray foam can properly seal.
Old or Settled Insulation
Fibreglass batts sag and compress over time, losing up to 50% of R-value. Blown-in cellulose settles. If your insulation is 15+ years old, it's likely underperforming.
Open-Cell vs Closed-Cell for Toronto Attics
The right foam depends on your attic type, budget, and goals. Here's a side-by-side comparison.
| Feature | Open-Cell (½ lb) | Closed-Cell (2 lb) |
|---|---|---|
| R-Value per Inch | R-3.7 | R-6.5 |
| Air Sealing | Excellent | Excellent |
| Vapour Barrier | No — vapour permeable | Yes — at 2" thickness |
| Moisture Resistance | Absorbs water | Waterproof |
| Structural Strength | Flexible, no racking strength | Adds wall/roof rigidity |
| Sound Dampening | Superior — absorbs sound | Good |
| Cost per Sq Ft | $1.50 – $3.50 | $3.00 – $5.00 |
| Best For | Vented attic floors, cathedral ceilings where vapour permeability is needed | Unvented roof assemblies, flat roofs, cathedral ceilings, basements |
Not sure which is right for your attic? We'll recommend the best option during your free site assessment.
Where We Apply Attic Spray Foam
Every attic is different. We insulate all common attic configurations found in Toronto homes.
Attic Floor (Ceiling Joists)
Standard application for vented attics. Spray foam between and over joists creates a continuous air barrier on the ceiling plane.
Roof Deck (Underside of Sheathing)
Creates an unvented, conditioned attic space. Ideal when HVAC equipment or ductwork is in the attic.
Cathedral Ceilings
Between rafters for vaulted rooms. Closed-cell is typically required to achieve code R-value in the limited rafter depth.
Knee Walls
Common in Toronto's century homes and 1.5-storey houses. Seals the transition between conditioned and unconditioned space.
Attic Hatches & Pull-Down Stairs
Major air leakage points that most insulation methods miss. We seal and insulate these access points completely.
Rim Joists
Where the attic floor meets exterior walls. Often overlooked, rim joists are a significant source of air leakage and heat loss.
How Attic Insulation Works
From quote to completion—most Toronto attic jobs are done in a single day.
Free Site Assessment
We inspect your attic, measure square footage, check existing insulation, and identify air leakage points. You get a detailed quote.
Prep & Protection
We mask and protect your home's interior, set up ventilation equipment, and prepare the attic for spraying.
Spray Application
Our crew applies spray foam to the specified thickness, ensuring complete coverage with no gaps or thermal bridges.
Inspection & Cleanup
We verify thickness and coverage, trim any excess foam, clean up completely, and walk you through the finished job.
Why Toronto Homeowners Choose GTA Foaming
Local expertise, honest pricing, and work we stand behind.
GTA-Wide Service
We serve all of Toronto and the Greater Toronto Area. From downtown condos to century homes in The Annex and High Park—we know the city's building styles.
Fully Licensed & Insured
Full liability insurance, WSIB coverage, and installations that meet or exceed Ontario Building Code requirements.
Upfront Pricing
Detailed written quotes before any work starts. No hidden fees, no surprises. We price per square foot so you know exactly what you're paying.
Real Job Photos
We document every project with before and after photos. Check our Toronto project gallery to see our work.
Same-Day Quotes
Contact us in the morning, get a site visit and written quote the same day. We know Toronto homeowners don't want to wait weeks.
Code-Compliant Installs
R-50 to R-60 for Toronto attics (Climate Zone 6) per Ontario Building Code. We don't cut corners on thickness or coverage.
Toronto Neighbourhoods We Serve
Fast attic insulation service throughout Toronto and surrounding communities.
Your Neighbourhood Not Listed?
We serve all of Toronto and the surrounding GTA. Call for a same-day quote.
Call (647) 613-3626What Toronto Homeowners Say
Real feedback from attic insulation projects across Toronto.
"Our century home in Leslieville had massive ice dams every winter—water damage on the third floor ceiling. GTA Foaming sprayed the attic floor with open-cell foam and the problem completely disappeared. First winter with no ice buildup. Wish we'd done it years ago."
"The top floor of our High Park semi was unbearable in summer—like a sauna. The crew sprayed closed-cell on the roof deck and now it's actually comfortable up there. Our energy bills dropped noticeably too. Great work."
"Got three quotes for our Danforth home. GTA Foaming was the most thorough—they actually climbed into the attic and inspected everything rather than just estimating from outside. Fair price, professional crew, finished in one day. Highly recommend."
Ontario Building Code for Toronto Attics
What you need to know about insulation requirements for homes in Climate Zone 6.
R-50 to R-60 Required
Ontario Building Code specifies R-50 minimum for attic insulation in Climate Zone 6 (Toronto). New builds and major renovations must meet this standard.
Ignition Barrier Required
Spray foam in accessible attics requires an ignition barrier or thermal barrier depending on the application and foam type. We ensure compliance on every job.
Ventilation Standards
Vented attics need proper soffit-to-ridge airflow maintained. Unvented assemblies require specific foam types and thicknesses. We design for both.
Attic Insulation FAQ — Toronto
Common questions about attic spray foam insulation for Toronto homes.
Ontario Building Code recommends R-50 to R-60 for attics in Climate Zone 6. With spray foam, you can achieve this with approximately 8–10 inches of open-cell or 7–8 inches of closed-cell foam.
Yes. Ice dams form when heat escapes through the attic and melts snow on the roof. Spray foam creates an air-tight seal that keeps heat inside your living space, preventing the freeze-thaw cycle that causes ice dams.
For most Toronto attics, open-cell is cost-effective and provides excellent air sealing and R-value. Closed-cell is recommended for cathedral ceilings, flat roofs, or areas requiring a vapour barrier and maximum R-value per inch.
Attic spray foam in Toronto ranges from $1.50 to $3.50 per square foot for open-cell, and $3.00 to $5.00 for closed-cell, depending on thickness and accessibility. Average attic projects run $3,000 to $8,000.
Most Toronto attic spray foam jobs are completed in one day. A typical 1,200–1,500 sq ft attic takes 4–6 hours including prep, application, and cleanup.
Not always. If existing insulation is dry and in reasonable condition, spray foam can be applied over it in some cases. However, if there's mould, moisture damage, or vermiculite (which may contain asbestos), removal is recommended before spraying.
Ready to Stop Losing Heat Through Your Attic?
Get a free site assessment and written quote. Most Toronto attic jobs are completed in one day.