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Markham · From $299

Roof Flashing Repair in Markham.

Replace and reseal step, counter, chimney, and skylight flashing — the #1 source of roof leaks. Markham homes see hard freeze-thaw cycles every winter — that's the #1 accelerator of chimney damage in the GTA. An annual sweep and inspection is the single cheapest insurance you can buy for your home.

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WETT certified · $5M insured · 5-year warranty

Why Markham chooses us

Flashing Repair you can actually trust

80% of roof leaks aren't shingle problems, they're flashing problems. We replace step flashing at walls, counter flashing at chimneys, valley flashing, skylight flashing, and plumbing boots. New aluminum or lead, mechanically fastened, sealed with tri-polymer sealant.

Every Markham technician is WETT SITE-Basic certified at minimum, with two inspectors carrying full SITE-Comprehensive credentials.

Scope

What's included

Benefits

  • Aluminum or lead — never galvanized-only
  • Mechanical fastening, not caulk-and-pray
  • Tri-polymer sealant, 20-year rated
  • Covers 80% of common leak sources

Our process

  1. 1. Identify failed flashing type and location
  2. 2. Remove shingle courses to expose flashing
  3. 3. Install new step / counter / valley / boot flashing
  4. 4. Re-shingle over new flashing, seal edges
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We serve every Markham neighbourhood

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The complete Markham guide

Roof Flashing Repair in Markham: everything before you book

Markham conditions that change how roof flashing repair is done

Most Markham homeowners book roof flashing repair for one reason and discover a second problem on the same visit.

Many Markham properties were re-roofed at least once without the flashing being re-detailed, leaving a cosmetic seal doing structural work.

Salt spray and road grit carried by winter wind accelerate corrosion on exterior metal components far faster in York than the manufacturer's rating assumes.

Across Commerce Valley, Angus Glen, Devil's Elbow, Milliken and Buttonville, the housing stock changes street by street, and the correct method changes with it. A century home with a soft-brick stack does not get the same treatment as a 2010 build with a factory-built vent — using one method on both is how systems get damaged.

If you live anywhere near Main Street Unionville, the practical takeaway is that a roof flashing repair visit should start with an assessment, not a tool. Any crew that begins work before telling you what they found is guessing on your behalf.

Warning signs Markham homeowners call us about

Homeowners rarely call because something failed — they call because something changed. In Markham the change is usually small, seasonal, and easy to talk yourself out of.

Symptoms also tend to arrive in pairs, and the pairing is the diagnostic clue. A smell plus a stain is a moisture path. Poor performance plus a noise is usually an obstruction.

  • Cold downdraft even when the damper is closed
  • A visible gap where flashing meets the wall
  • Lint accumulating around the exterior vent hood
  • Clothes taking two cycles to dry
  • A smell that gets stronger on humid days
  • A damper that no longer seats or no longer moves
  • Smoke rolling back into the room when you first light a fire
  • Water stains on the ceiling near the chase
  • Soot marks fanning above the firebox opening

Not sure which service you need? Compare Animal Removal in Markham, Chimney Removal in Markham, Chimney Relining in Markham — or start with the full Markham service hub.

What happens from arrival to hand-off

What follows is the actual run of a visit in Markham, not a marketing summary of one.

You are welcome to watch any part of it. Most homeowners look at the scope footage, and we would rather explain a finding on the spot than in an invoice.

  • Interior protection — drop sheets, HEPA vacuum staged before any tool is opened
  • Arrival window confirmed by text, with the technician's name and photo
  • Exterior walk-around to check crown, cap, flashing and termination
  • Verification pass — draft test, airflow reading or water test as applicable
  • Written findings with priority ranking: safety-now, this-season, monitor
  • Photo hand-off: before and after images sent to you the same day
  • Camera or scope inspection where access allows, so findings are evidence-based
  • The service itself, performed to CSIA / WETT method

How roof flashing repair in Markham is priced

Roof Flashing Repair in Markham starts at $299 for a standard, accessible system in serviceable condition. That figure is a starting point, not a quote: the honest answer is that several variables move the final price, and any company that quotes a firm number before seeing the system is either padding it or planning to revise it on site.

We give written quotes before work begins, and any repair discovered during the visit is presented as a separate priced option — never added to the invoice without your approval.

The cheapest quote in Markham is frequently the most expensive outcome, because a short visit with no documentation leaves you paying again for the diagnosis you thought you had bought.

FactorHow it affects your price
AccessRoof pitch, storey count, and whether a ladder or scaffold is required
Run lengthLonger or multi-elbow runs add labour and specialty tooling
DocumentationInsurance or real-estate reports require a deeper written scope than routine service
ConditionFirst service after several years takes longer than an annual maintenance visit
System typeWood, gas, oil and mechanical venting each carry different method and time
FindingsRepairs discovered during service are quoted separately and never auto-charged

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When to schedule roof flashing repair in Markham

The seasonal argument is not about price, it is about doing the work properly. Exterior repairs need temperature to cure, and a fall backlog compresses the time available for each visit.

SeasonWhat to expect
Spring (Mar–May)Best availability and pricing. Ideal for repairs — mortar cures properly above 5°C.
Summer (Jun–Aug)Quietest window. Best time for rebuilds, liner work and any project needing multiple days.
Early fall (Sep–Oct)Peak demand begins. Book 2–3 weeks ahead to secure a date before first fire.
Winter (Nov–Feb)Emergency and diagnostic work only for most exterior repairs; interior service continues.

Mistakes to avoid when hiring for roof flashing repair

The complaints we hear about other contractors in Markham are remarkably consistent. Almost all of them trace back to one of the items below, and almost all of them are avoidable with two questions: "will I get photos?" and "is the finding written down?"

  • Hiring the crew already on the roof for another trade, without certification for this one
  • Choosing a cap or liner by price rather than by appliance and fuel type
  • Booking on price alone and getting a 20-minute visit with no documentation
  • Deferring a small repair through one more winter — freeze-thaw doubles the damage
  • Replacing a component without correcting the condition that destroyed the first one
  • Accepting a verbal finding with no photo evidence
  • Assuming a home inspection at purchase covered the flue; almost none do

Included, excluded, and quoted separately

A quote is only meaningful alongside its scope. This is what is inside the Markham price and what sits outside it.

  • Workmanship warranty in writing
  • Photo documentation before and after
  • Answers to your questions on site, in plain language, without a sales script
  • Full method service performed to manufacturer and code standard
  • Written condition report with prioritised recommendations
  • Exterior termination and cap check as part of the same visit
  • Not included: Parts on obsolete or discontinued appliances that must be special-ordered
  • Not included: Structural rebuild work discovered during inspection (quoted separately)
  • Not included: Interior finish repair (drywall, paint) where prior water damage already exists
  • Not included: Appliance servicing that falls under a licensed gas fitter's scope

One case that explains the method

A Markham homeowner called about a draft problem that turned out to be a kitchen exhaust fan overpowering the flue. No repair was needed at all; the answer was a make-up air adjustment and a change in how the appliance was started.

The lesson generalises: in Markham, what costs money is time, not complexity. Nearly every large invoice we write could have been a small one two seasons earlier.

The standards behind the work in Markham

Work in York is governed by provincial code and national standards, and insurers increasingly ask for proof that both were followed. Documentation is not paperwork for its own sake — it is what turns a denied claim into a paid one.

  • NFPA 211 levels of inspection as the reference for scope and reporting
  • Ontario Building Code and the O. Reg. 332/12 requirements governing venting and clearances
  • Manufacturer installation instructions, which the code treats as binding
  • Local municipal permit thresholds, which differ across the region
  • CSA B149.1 where a gas appliance shares the venting system
  • Insurer documentation requirements for post-incident and pre-renewal claims

DIY versus professional roof flashing repair in Markham

Plenty of this is homeowner work. Walk the exterior twice a year with a phone camera, keep the termination clear, note anything that changed since the last set of photos, and you will catch most problems while they are still cheap.

Where DIY stops is anywhere a mistake is invisible. A flue that looks clean from below can still hold glazed creosote out of sight. A vent that moves air can still be running at half its rated flow. A crack sealed from the outside can trap the water it was meant to shed.

The practical split most Markham homeowners land on: handle the visual monitoring yourself, and book a certified inspection annually so the invisible half is documented by someone carrying $5M liability coverage.

FAQ

Flashing Repair in Markham — common questions

What is step flashing?+

Small L-shaped metal pieces woven into each shingle course where the roof meets a wall. When they fail, water enters at every course — usually where the ceiling stain shows up years later.

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