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Flat Roof Problems? We Fix It Fast, We Fix It Right.
Toronto's flat roof specialists — flat roofs exclusively, every system, diagnosed with instruments and verified by independent inspection before you pay.
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No obligation · Free on-site diagnostic · Serving Toronto & the GTA
100% flat roofs. It's all we do — and it's why we find what others miss.
Flat Roof Toronto is a true flat roof specialist. We don't do shingles, siding, or a bit of everything — for fifteen years we've worked on flat roofs exclusively, across every membrane system this city uses: two-ply SBS modified bitumen, TPO, EPDM, PVC, liquid-applied, tapered insulation, and green roof assemblies.
That single focus is the whole point. A leak on a flat roof rarely enters where it shows inside — water tracks metres before it drips. General roofers guess and replace. We diagnose with instruments, and very often the honest answer isn't a new roof at all: it's a ponding-water correction, a condensation problem, or a targeted repair that saves you thousands. When a full replacement is genuinely needed, we build it right and verify it before you pay.
Know MoreEvery Flat Roof System,
Delivered with Excellence
Residential and commercial flat roofs built for lasting value — diagnosed, cut with modern machinery, and finished clean, right across Toronto and the GTA.
What We Handle
Contact Us- Flat Roof Replacement & Re-Sloping
- Flat Roof Repairs & Leak Detection
- New Installations & New Construction
- Restoration & Reinforcement Coatings
- Instrumented Inspections & Reports
- SBS Modified Bitumen · EPDM · TPO · PVC
- Emergency Leak Response & Insurance Support
The Flat Roof Diagnostics No Other Toronto Roofer Brings
This is what sets us apart. General roofing companies look at a stain and sell a roof. We're flat roof specialists — we bring the instruments to find the actual problem, and just as often we save you from a replacement you didn't need. A "leak" is frequently condensation. Recurring wet spots are frequently ponding water from a slope that never drained. Getting the diagnosis right is the single biggest thing that protects your money.
Infrared Thermal Scanning
Thermal imaging reads the roof's heat signature to reveal saturated insulation and trapped moisture invisible from the surface — so you replace only what has actually failed, never the whole roof by default.
Smoke Screen Detection
Non-toxic smoke pushed beneath the membrane escapes through pinhole breaches and failed seams that no visual inspection will ever find — pinpointing the true entry point.
Controlled Water Testing
Sectioned flood testing confirms exactly where water enters — and after the repair, confirms it stopped. We never hand a roof back on a hope.
Condensation vs. Leak Analysis
Humidity readings, dew-point calculation, and vapour-barrier assessment settle the winter misdiagnosis that costs Toronto homeowners thousands — because sometimes it isn't a leak, and no membrane work will ever fix it.
Drainage & Ponding Survey
We map how water actually moves on your roof. Recurring wet spots are often ponding from bad slope — a re-slope fix, not a new roof. Diagnosing this correctly is what saves you the most.
Modern Roof-Cutting Machinery
Machine-assisted cutting and tear-off through any number of roof layers — cleaner edges, faster removal, and no collateral damage to the deck below.
Seamless Wheeled-Trailer Disposal
No dumpster bins dropped on your property — debris leaves in wheeled trailers, so your driveway and landscaping stay untouched.
Is It a Leak — or Condensation?
Every winter, Toronto homeowners see a ceiling stain and assume the worst. Often it was never a leak — it's condensation forming inside the roof assembly, or ponding water from a slope that doesn't drain. No amount of membrane work fixes those. We diagnose the real cause first, then recommend the smallest fix that actually solves it. Honest diagnosis is our specialty — and frequently our clients keep the roof they have.
Signs it's a leak
- Appears during or shortly after rain or thaw
- Localized staining that grows with each rainfall
- Traceable to a membrane breach, flashing, or drain
- Active dripping in wet weather; dry otherwise
Signs it's condensation or ponding
- Appears in cold snaps — even with no rain at all
- Widespread damp, frost under the deck, morning drips
- Worse above kitchens, bathrooms, humidifiers
- Wet spots that return in the same low areas after every rain
Committed To Precision, Safety, And Clean Sites
Licensed & Insured
Fully licensed and insured with WSIB coverage. Working at Heights, Fall Protection, and First Aid certification on every crew — compliance on every Toronto project, documented.
Modern Machinery
Machine-assisted roof cutting and tear-off through any number of layers — precise, fast, and safe, with the deck protected throughout.
No-Bin Disposal
Debris leaves in wheeled trailers, not driveway-crushing dumpster bins. Your property is left exactly as we found it — minus the old roof.
Your Claim Starts With The Right First Report
With flat roof storm or water damage, the very first inspection report decides everything — whether your claim is approved, how much is covered, and what the insurer accepts as the cause of loss. A vague report gets denied. Our instrumented first report gives your adjuster hard evidence: thermal scans, moisture maps, and photo documentation that stand up to scrutiny.
Instrumented First Report
We document the damage the day we arrive — thermal imaging, moisture mapping, and dated photos — establishing the cause of loss clearly and defensibly.
Cause-of-Loss Determination
Storm, wind, impact, or age? Our report distinguishes covered sudden damage from wear-and-tear — the distinction your claim lives or dies on.
Adjuster-Ready Documentation
A written report and evidence package formatted the way insurers expect — so your adjuster has everything needed to approve the claim without delay.
Repair & Verification
Once approved, we complete the work to code and verify it with a final inspection — closing the claim clean.
Most denied flat roof claims fail on documentation, not damage. We give your insurer no room for doubt — evidence first, opinions second.
Our Projects
Full Replacement, North Toronto Tear-off and rebuild with corrected slope and drainage — completed in two days.
New Build Installation Two-ply SBS system for a custom addition — engineered drainage from day one.
Thermal Leak Detection Hidden moisture mapped by infrared — a targeted repair instead of a full replacement.
Membrane Repair, Etobicoke Root-cause seam and flashing repair — water-tested before handover.
Restoration, Before & After Reinforcement coating adding 10–15 years of life at a fraction of replacement cost.
Documented Inspection Instrumented pre-purchase inspection with full photo report for the buyer.
Diagnosing With Instruments,
Delivering With Confidence
Every step is designed for evidence, quality, and a smooth experience — from first scan to independent inspection.
Instrumented Diagnosis
Thermal scanning, smoke testing, or controlled water testing finds the real problem — not a guess from the ground.
Evidence-Based Quote
A clear written price built on findings, with honest options — repair when repair is right, replacement only when proven necessary.
Precision Build
Machine-assisted cutting, certified membranes, corrected slope and drainage — with wheeled-trailer disposal protecting your property.
Verified Handover
Water-tested and independently inspected — and you pay only after it passes.
Clients We've Served
From municipal buildings to property managers and home builders across the GTA — organizations that need it done right the first time choose Flat Roof Toronto.
Client Testimonials
" Flat Roof Toronto did an incredible job replacing our old, leaking flat roof. From the first inspection to the final cleanup, everything was handled professionally — and we finally feel confident about our roof. "
— Lisa M., Homeowner" Their quote was detailed, fair, and the work exceeded expectations. High-quality materials, on time, with no disruptions to our business. "
— David S., Commercial PropertyToronto & the GTA
From the heritage flat roofs of Rosedale and the Annex to Leslieville laneway houses, Etobicoke semis, and North York commercial decks — fifteen years on this city's rooftops means we know its failure patterns block by block.
Asked Often
Is my ceiling stain a roof leak or condensation?
Timing is the biggest clue: leaks appear during or after rain and thaw; condensation appears in cold snaps even without precipitation, often above kitchens and bathrooms. We diagnose it definitively with humidity readings, thermal imaging, and vapour-barrier assessment — because repairing the wrong one wastes thousands, and sometimes it means you don't need a new roof at all.
Do I always need a new roof if my flat roof leaks?
No — and this is our specialty. Many "leaks" are condensation or ponding water from bad slope, which membrane replacement won't fix. Our instrumented diagnosis finds the true cause first, and often the answer is a targeted repair or re-slope that saves you thousands.
Can you help with a flat roof insurance claim?
Yes, and the first report is everything. We document the damage the day we arrive with thermal scans, moisture mapping, and dated photos, then produce a written cause-of-loss report adjusters accept — the difference between an approved claim and a denied one.
How much does a flat roof replacement cost in Toronto?
Most projects range from $10 to $16 per square foot depending on size, materials, insulation, and complexity. A detailed written quote follows an on-site diagnostic — never a guess from the ground.
What flat roof systems do you install?
All of them: two-ply SBS modified bitumen, TPO, EPDM, PVC, liquid-applied and hybrid systems, tapered insulation assemblies, and green roof waterproofing. We recommend on evidence, not inventory.
How do you remove the old roof without wrecking my property?
Machine-assisted cutting handles any number of roof layers with clean edges and a protected deck — and debris leaves in wheeled trailers rather than driveway-crushing dumpster bins. Your driveway and landscaping stay untouched.
Do you offer emergency repairs?
Yes — fast response across Toronto and the GTA, with temporary waterproofing in any weather including winter, followed by a permanent repair.
What is ponding water and why does it matter?
Water still sitting 48 hours after rain. It accelerates membrane breakdown and is the leading cause of premature failure. We correct it at the source: re-sloping, tapered insulation, drainage correction — not just new membrane over the same bad geometry.
How long does a flat roof last in Toronto?
With proper installation, drainage, and maintenance: 15–30 years. Neglected drainage — not weather — is what usually cuts that short.
When do I pay?
After your roof passes an independent inspection. Payment behind proof, on every project.