📞 (647) 494-1699Get a Free Quote
Free Quote
Roof Repair

Roof Flashing Repair in Toronto & the GTA

Shingles get the attention, but flashing does the hard work. Every place your roof meets something — a wall, a chimney, a skylight, a valley, the edge of the deck — sheet metal is what actually keeps water out. Industry estimates vary, but most roofers will tell you the majority of leaks they trace end at a flashing, not a shingle. Rusted step flashing and pulled-away wall flashing are the classics.

Good flashing work is layering, not sealing. Step flashing laces piece by piece into each shingle course so water steps down and out; wall flashing tucks behind siding or into a masonry cut; drip edge kicks water off the deck into the eavestrough. Caulking is a garnish, not the meal — when you see a flashing buried in tar, you're looking at a previous repair that treated the symptom. GTA freeze-thaw opens those tar jobs within a couple of winters.

We quote based on what the metal needs: some flashings can be lifted, refitted and resealed; rusted-through or badly bent metal gets replaced and properly interlaced. Where the fix is genuinely small — a lifted section reseated, a couple of steps swapped — that's what we'll quote, because a correct small repair here prevents the expensive kind of leak, the slow one you don't see for years.

What this covers

  • Inspection of all flashing details in the problem area — step, wall, valley, drip edge and penetrations
  • Replacement of rusted, bent or missing step flashing, interlaced course by course with the shingles
  • Refitting or replacing wall flashing where roof meets siding or masonry, tucked properly behind the cladding
  • Drip edge repair or replacement along eaves and rakes so runoff clears the fascia
  • New valley flashing sections where the metal has worn through or was never wide enough
  • Replacement of surrounding shingles disturbed during the metal work
  • Sealing of fasteners and laps with appropriate sealant — as a finishing detail, not the waterproofing
  • Photos of the completed detail so you can see how the layers went together

Just need one small job done?

Refit loose drip edgeRe-flash a dormerRe-fasten wind-lifted flashing

What affects the price

  • Which flashing failed — reseating a drip edge section is quick; rebuilding step flashing up a wall is not
  • Whether siding or masonry has to be opened up to tuck new metal in properly
  • Metal choice: galvanized, aluminum or copper for longevity and to match what's there
  • How many shingle courses must come up and go back to interlace the new flashing
  • Access — flashing details cluster at chimneys and dormers, often the highest, steepest parts of the roof
  • Hidden damage under the old flashing, since long-failed metal usually means some wet decking

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.

Roof Flashing Repair near you

We take quote requests across the GTA. Local pages:

TorontoEtobicokeNorth YorkScarboroughEast YorkYorkMississaugaBramptonCaledonVaughanMarkhamRichmond HillAuroraNewmarketKingWhitchurch-StouffvilleEast GwillimburyGeorginaPickeringAjaxWhitbyOshawaClaringtonUxbridgeOakvilleBurlingtonMiltonHalton HillsHamiltonSt. CatharinesNiagara FallsGrimsbyNiagara-on-the-LakeBarrieInnisfilBradford West GwillimburyNew TecumsethKitchenerWaterlooCambridgeGuelphOrangeville

Common questions

How do I know if my roof leak is a flashing problem?
Location is the tell. Leaks that show up near a chimney, along a wall where a lower roof meets the house, around a skylight or at a valley are flashing suspects until proven otherwise. Leaks that appear after wind-driven rain but not gentle rain also point at flashing laps. Mid-slope stains far from any feature are more likely a shingle or nail issue. Photos of your roof usually let us call it.
Can flashing just be resealed instead of replaced?
Sometimes, and when it can, that's the honest cheap fix. Metal that's sound but has a failed sealant joint or a lifted edge can be reseated and resealed for years more service. What doesn't work is caulking over rusted-through, badly corroded or wrongly-layered metal — the sealant bridges the gap for a season or two, then GTA freeze-thaw reopens it. We'll tell you which case yours is; roughly half the time it's the cheap one.
What is step flashing and why does it matter?
Step flashing is the row of L-shaped metal pieces where a sloped roof runs along a wall — one piece per shingle course, each overlapping the one below like the shingles themselves. Water steps down metal to metal and exits onto the roof. It matters because the common shortcut, one long bent strip caulked against the wall, works until the caulk fails, then funnels water straight into the wall cavity where damage stays hidden.
Should flashing be replaced when the roof is reshingled?
Usually yes, and it's the cheapest moment to do it — everything is already open. Reusing old flashing on a new roof is a false economy unless the metal is genuinely sound and can be removed without damage. Drip edge and valley metal in particular should go new. If a reshingling quote says nothing about flashing, ask; that silence is where the lowball quotes hide.
How long does roof flashing last?
Properly installed galvanized or aluminum flashing generally outlasts one set of shingles and sometimes two — decades, in practice. Copper lasts longer still. What shortens the life isn't the metal, it's the details: sealant joints that need attention every several years, fasteners that back out, and contact between incompatible metals that accelerates corrosion. An occasional look at your flashings, or photos to someone who knows what to look for, catches all of these early.

Ready to sort out your roof flashing repair?

Tell us what your home needs — a small fix or a full project — and get a free quote.

Get a Free QuoteWhatsApp usCall (647) 494-1699