[ Repair & Waterproofing ]
Roof Repair & Waterproofing
Most flat-roof failures don't start as a hole — they start as a blister, a split seam, or flashing that's pulled away from a parapet after one too many freeze-thaw cycles. Caught early, these are inexpensive, targeted repairs. Left alone through a Montreal winter, they become interior water damage.
We diagnose the actual source of the leak — which is rarely where the ceiling stain shows up — and repair or re-waterproof only what needs it, rather than defaulting to a full replacement quote.
Signs your roof needs repair now
- ◆Interior water stains, especially ones that appear after rain or snowmelt
- ◆Visible blistering, bubbling or splitting in the membrane
- ◆Ponding water that hasn't drained 48 hours after rainfall
- ◆Flashing separated from parapets, vents or HVAC curbs
- ◆Granule loss or bare patches on the gravel/cap sheet
[ Our Process ]
How it works
- STEP_01
Free on-site diagnosis
We trace the leak to its actual source, not just the visible symptom, and document it with photos.
- STEP_02
Written scope & quote
You get a clear repair scope before any work starts — no open-ended time-and-materials billing.
- STEP_03
Targeted repair
Membrane patching, re-flashing, seam re-sealing or localized re-waterproofing, matched to the existing system.
- STEP_04
Drainage correction
Where ponding is the root cause, we address slope and drain function, not just the symptom.
- STEP_05
Guarantee
Every repair is backed by a written guarantee on the work performed.
[ Why Toiture KSC ]
- ◆Diagnosis-first approach — we won't quote a full replacement when a repair will hold
- ◆Same crews handle emergency tarping and the permanent fix, so nothing gets redone
- ◆Compatible materials matched to your existing membrane type to avoid galvanic or adhesion issues
- ◆Written guarantee on every repair, not just full installations
[ FAQ ]
Frequently asked questions
Is the diagnosis really free?
Yes. We inspect and identify the leak source at no charge, and you only pay if you approve the repair scope.
Can a torch-on membrane or shingles be repaired instead of replaced?
In most cases, yes — isolated blistering, seam failure, damaged shingles and flashing issues are all repairable. We only recommend replacement when failure is widespread.
How fast can you get someone out for a leak?
Non-emergency repairs are typically scheduled within a few business days. For active leaks, see our 24/7 emergency service.
Do you waterproof foundations or balconies too?
Our waterproofing work is focused on roof membranes, flashing and related building envelope details — ask us if your project falls in that scope.
Ready to get started?
Free, no-obligation quote — usually answered within one business day.
Request a Free Quote