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Ice Dam Risk Map · Winter 2026 · King

King Ice Dam Risk Map — Where Roofs Freeze First

TL;DR

In King, ice dams form when attic heat melts snow that refreezes at the cold eave. High-risk zones share three traits: 1½-story rooflines, under-insulated attics (R-30 or lower), and undersized eavestroughs. Fixes: seal attic bypasses, add R-60 insulation, install heat cable at problem eaves, and upsize downspouts to 3"×4". Same-week diagnostic + estimate available across King.

Call (437) 475-3344

Why ice dams are a King problem

King sits in a freeze-thaw corridor — daytime highs above 0°C and overnight lows well below. That cycle is the exact condition ice dams need. A warm attic melts the snow layer against the roof deck; the meltwater runs to the unheated eave; it refreezes into a dam; the next melt pushes water uphill under the shingles. Damage shows up as ceiling stains, peeling paint at the top of exterior walls, and rot at the fascia.

Homes built before the 1990 Ontario Building Code update are the most at risk — those attics were insulated to roughly R-20 and rarely had continuous soffit-to-ridge venting. Newer builds fail when pot lights, bath fans, or attic hatches leak warm air into the attic.

The four-step permanent fix

  1. Seal. Air-seal every attic bypass — pot lights, top plates, plumbing stacks, bath fan boots.
  2. Insulate. Blow cellulose to R-60 (about 16 inches) across the entire attic floor.
  3. Vent. Continuous soffit intake plus ridge exhaust — 1 sq ft NFA per 300 sq ft of attic floor.
  4. Drain. 5" or 6" K-style eavestrough, 3"×4" downspouts, and heat cable on chronic-dam eaves.

King pricing snapshot

  • Ice-dam steam removal (emergency): $450–$950 per visit
  • Heat cable install (40 ft eave + downspout): $600–$1,100
  • Attic air-sealing + top-up to R-60: $2,800–$4,200
  • Full gutter replacement (2-storey detached): $2,400–$4,800

Neighborhood-by-neighborhood in King

Ice dam risk isn't uniform across King. Older housing stock, tree cover, and lot exposure to prevailing northwest winds all shift the risk profile. Below: risk read-outs for the neighborhoods we service most.

King

King City

  • Risk band: High — driven by 1½-storey builds and long eaves.
  • Typical fix in King City: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across King City through March.
  • Free 30-minute attic + roof assessment for King City homeowners this winter.
King

Nobleton

  • Risk band: Elevated — driven by 1½-storey builds and long eaves.
  • Typical fix in Nobleton: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Nobleton through March.
  • Free 30-minute attic + roof assessment for Nobleton homeowners this winter.
King

Schomberg

  • Risk band: Moderate — driven by 1½-storey builds and long eaves.
  • Typical fix in Schomberg: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Schomberg through March.
  • Free 30-minute attic + roof assessment for Schomberg homeowners this winter.
King

Pottageville

  • Risk band: Moderate — driven by 1½-storey builds and long eaves.
  • Typical fix in Pottageville: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Pottageville through March.
  • Free 30-minute attic + roof assessment for Pottageville homeowners this winter.
King

Kettleby

  • Risk band: Elevated — driven by 1½-storey builds and long eaves.
  • Typical fix in Kettleby: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Kettleby through March.
  • Free 30-minute attic + roof assessment for Kettleby homeowners this winter.
King

Ansnorveldt

  • Risk band: Moderate — driven by 1½-storey builds and long eaves.
  • Typical fix in Ansnorveldt: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Ansnorveldt through March.
  • Free 30-minute attic + roof assessment for Ansnorveldt homeowners this winter.
King

Snowball

  • Risk band: High — driven by 1½-storey builds and long eaves.
  • Typical fix in Snowball: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Snowball through March.
  • Free 30-minute attic + roof assessment for Snowball homeowners this winter.
King

Laskay

  • Risk band: Moderate — driven by 1½-storey builds and long eaves.
  • Typical fix in Laskay: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Laskay through March.
  • Free 30-minute attic + roof assessment for Laskay homeowners this winter.
King

Lloydtown

  • Risk band: High — driven by 1½-storey builds and long eaves.
  • Typical fix in Lloydtown: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Lloydtown through March.
  • Free 30-minute attic + roof assessment for Lloydtown homeowners this winter.
King

Kinghorn

  • Risk band: Moderate — driven by 1½-storey builds and long eaves.
  • Typical fix in Kinghorn: attic air-sealing + R-60 top-up, plus heat cable on the north-facing eave.
  • Emergency steam removal available same-day across Kinghorn through March.
  • Free 30-minute attic + roof assessment for Kinghorn homeowners this winter.

FAQ — Ice Dam Risk in King

Are ice dams covered by insurance in King?+

Most Ontario policies cover the interior water damage from an ice dam but not the ice dam itself, and repeated claims can trigger non-renewal. Fixing the root cause (insulation + venting) is usually cheaper than one deductible.

Will heat cable alone stop ice dams?+

No. Heat cable is a symptom manager. Without attic air-sealing and proper insulation, dams will still form above the cable. Use it as a supplement, not a fix.

How fast can you respond to an active ice dam?+

Same-day emergency steam removal across King. Do not chip ice with hammers or use rock salt on the roof — both void most shingle warranties.

What R-value should my attic be?+

Ontario's current target is R-60. Anything under R-40 is a strong ice-dam predictor.

The complete King guide

Ice Dam Risk in King: everything before you book

King conditions that change how ice dam risk is done

Most King homeowners book ice dam risk for one reason and discover a second problem on the same visit.

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

Snow load and ice damming stress the roof-to-wall junction each winter; by spring the sealant that was doing the work has usually torn.

Across Laskay, Snowball, Kinghorn, Pottageville and Schomberg, 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.

the practical takeaway is that a ice dam risk 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 King homeowners call us about

Homeowners rarely call because something failed — they call because something changed. In King 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.

  • A damper that no longer seats or no longer moves
  • A crown that has hairline cracks radiating from the flue tile
  • Cold downdraft even when the damper is closed
  • Mortar joints you can scratch out with a key
  • A visible gap where flashing meets the wall
  • Standing water or rust flakes in the clean-out door
  • Clothes taking two cycles to dry
  • Rust on the damper, firebox or vent hood
  • Water stains on the ceiling near the chase

Not sure which service you need? Compare Dryer Vent Cleaning in King, Waterproofing in King, Liner Install in King — or start with the full King service hub.

What happens from arrival to hand-off

What follows is the actual run of a visit in King, 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
  • Verification pass — draft test, airflow reading or water test as applicable
  • Exterior walk-around to check crown, cap, flashing and termination
  • Full visual assessment and photo documentation of the starting condition
  • Camera or scope inspection where access allows, so findings are evidence-based
  • The service itself, performed to CSIA / WETT method
  • Baseline readings taken before work starts, so the improvement is measurable
  • Written findings with priority ranking: safety-now, this-season, monitor

How ice dam risk in King is priced

Ice Dam Risk in King starts at $189 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 King 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
Weather windowExterior work that must cure above 5°C is scheduled, not squeezed in
MaterialsStainless, cast-in-place and clay each price differently for the same repair
DocumentationInsurance or real-estate reports require a deeper written scope than routine service
FindingsRepairs discovered during service are quoted separately and never auto-charged
UnitsMultiple flues or appliances on one visit share travel but not labour

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When to schedule ice dam risk in King

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 ice dam risk

The complaints we hear about other contractors in King 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?"

  • Booking on price alone and getting a 20-minute visit with no documentation
  • Skipping the inspection because the appliance 'seems fine'
  • Accepting a verbal finding with no photo evidence
  • Assuming a home inspection at purchase covered the flue; almost none do
  • Choosing a cap or liner by price rather than by appliance and fuel type
  • Approving a rebuild quote without seeing the interior scope footage that justifies it
  • Sealing the symptom (caulk over a crack) instead of correcting the water path

Included, excluded, and quoted separately

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

  • HEPA containment and complete clean-up of the work area
  • 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
  • Verification test on completion
  • 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 King 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 King, what costs money is time, not complexity. Nearly every large invoice we write could have been a small one two seasons earlier.

DIY versus professional ice dam risk in King

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 King 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.

We run the same method in neighbouring markets — Ice Dam Risk in Mississauga, Ice Dam Risk in Georgina, Ice Dam Risk in St. Catharines.

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