Mississauga & Peel Region
Chimney Leak & Flashing Repair in Mississauga
A ceiling stain beside the chimney has exactly four likely causes: failed flashing where the stack meets the roof, a cracked crown, a missing or damaged cap, or masonry so saturated that water is tracking through the brick itself. Sealing the wrong one is why so many homeowners have paid twice for the same leak.
Typical range $450 – $1,800· Flat written price before we start
Get a price for chimney leak & flashing repair
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Same-week chimney and fireplace bookings across Peel Region
Flat, written pricing confirmed before a single tool comes out
WETT-certified, insured, background-checked technicians
Photo-documented safety report emailed after every visit
What we do
Chimney Leak & Flashing Repair in Mississauga — how it works
We diagnose before we quote. That means a roof-level inspection of the flashing detail, a crown and cap assessment, a moisture check on the interior chase, and where necessary a controlled water test to reproduce the leak. Then we fix the actual entry point and put the warranty in writing.
Signs you need this service
- Water stains on the ceiling or wall next to the chimney
- Damp, musty smell in the chase or attic near the stack
- Rusted damper, or water visible in the firebox after rain
- Peeling paint or crumbling drywall beside the fireplace
- Tar or caulk smeared over the flashing by a previous repair
- White efflorescence on interior masonry
What's included
- Diagnosis of the actual entry point, documented with photos
- Step and counter flashing in proper metal, mortar-set where required
- Cricket installation on wide chimneys where the roof demands it
- Crown and cap corrected in the same visit where they contribute
- Written workmanship warranty
Our process
Step by step, start to finish
- Step 1
Interior and attic check
Where the water shows up, and where it is actually entering, are rarely the same place.
- Step 2
Roof-level flashing inspection
Step and counter flashing, cricket, shingle detail and any previous tar repairs.
- Step 3
Crown, cap and masonry review
The other three entry points ruled in or out with photos.
- Step 4
Water test if needed
Controlled hose testing section by section to reproduce the leak precisely.
- Step 5
Correct repair, written warranty
Proper metal flashing reinstalled — not more caulk over a failed detail.
Pricing
Chimney Leak & Flashing Repair in Mississauga cost
Real 2026 ranges for Peel Region. Your exact number is confirmed in writing after we see the chimney.
| Work | Typical range | What moves the price |
|---|---|---|
| Flashing repair | $450 – $850 | Localised section, existing detail sound |
| Full flashing replacement | $850 – $1,800 | Step and counter flashing, roof type |
| Cricket / saddle installation | $600 – $1,500 | Chimney width and roof pitch |
| Breathable masonry waterproofing | $250 – $600 | Applied after repairs cure |
Local knowledge
What this looks like around Mississauga
Wide chimneys on the shallow-pitch roofs common in 1990s Mississauga and Brampton subdivisions need a cricket — a small peaked diverter behind the stack. Many were built without one, which dams snow and water against the upslope face every winter.
Burlington and Applewood shoreline properties take wind-driven rain sideways into flashing laps that would be fine anywhere else. Flashing there needs a deeper lap and mortar-set counter flashing, not surface sealant.
FAQs
Questions homeowners ask us
Why is my chimney leaking when it rains?
In order of likelihood: failed flashing at the roof line, a cracked crown, a missing or damaged cap, or saturated brick and mortar. Diagnosing which one before repairing is the whole job — sealing the wrong element is why leaks come back.
Can you just caulk the flashing?
Caulk and roofing tar are temporary at best and usually make the real repair harder later. Flashing is a metal detail that has to shed water by geometry; when it has failed we replace it properly.
Does waterproofing the brick fix a leak?
Only when saturated masonry is genuinely the entry point, and only with a breathable siloxane repellent. Sealing brick with a non-breathable coating traps moisture inside and makes spalling worse.
How fast can you come out?
Active leaks are prioritised. We can usually get to a Mississauga or Brampton address within a couple of days and apply temporary protection immediately if the permanent repair has to wait for weather.
Related services
Other work we do on Mississauga chimneys
Chimney Crown Repair in Mississauga
Reseal or rebuild the concrete slab on top of the chimney that keeps water out.
View chimney crown repair in mississauga detailsChimney Cap Installation in Mississauga
Stainless single, multi-flue and draft-correcting caps that stop rain, animals and downdraft.
View chimney cap installation in mississauga detailsChimney Brick & Masonry Repair in Mississauga
Repointing, spalled brick replacement and above-roofline rebuilds with matched mortar.
View chimney brick & masonry repair in mississauga detailsBook chimney leak & flashing repair in Mississauga
Call (289) 906-3881 or send the form — flat written pricing, WETT-certified technicians, same-week appointments across Peel Region.