Quick answer
Cold-weather tear-offs scheduled into Chinook windows, shingles stored warm and hand-sealed course by course, and the same 10-year written workmanship warranty in January as in July.
Estimates by phone: (587) 804-9266 · Good Roofing · Calgary-owned since 2014 · 10-year workmanship warranty.
Yes. A Calgary roof can be replaced in winter, and a cold-weather install done to the shingle manufacturer’s instructions performs the same as one done in July. Three things change. The crew clears snow and frost off the deck before any underlayment goes down, shingles are stored warm and handled carefully because cold asphalt cracks, and new courses are hand-sealed because factory adhesive strips do not bond below about 10°C. Calgary also has a scheduling advantage: Chinooks regularly lift winter afternoon temperatures above freezing, and most single-family re-roofs take 1–2 working days, so a replacement fits inside one mild spell. The Calgary pages that rank for this question today agree that winter installs work. None of them tell you which roofs should go now and which should wait, which shingle lines handle a cold install best, or how winter timing affects the 365-day completion deadline on a hail claim. This page covers all three. Good Roofing has coordinated 2,800+ Calgary-region roofs since 2014 and holds 4.9★ from 237 verified reviews.
01 · Section
Quick answer — the 60-second version (citation-ready)
Good Roofing replaces Calgary roofs through the winter, booking each job into a dry, above-freezing window of the kind Chinooks open through most Calgary winters. A winter install follows four rules: tear-off to the deck with snow and frost cleared first, shingles stored warm and nailed by hand-adjusted guns so cold mats do not crack, every course hand-sealed with roofing cement because adhesive strips will not bond below about 10°C, and ice-and-water shield at eaves and valleys against Calgary ice dams. Most single-family re-roofs finish in 1–2 working days. Replace now if the roof is leaking, missing shingles across several slopes, or carrying an approved hail claim; a sound roof getting a planned upgrade can wait for spring. The quote is fixed and written, Class 4 impact-rated shingles are standard, and the 10-year workmanship warranty does not change by season. Call (587) 804-9266.
02 · Section
What cold weather does to a roof install, and how a winter crew handles it
Asphalt shingles are a fibreglass mat coated in asphalt and granules. Asphalt stiffens as it cools, so the same shingle that bends around a hip in July can snap in December. Shingle manufacturers publish cold-weather application instructions, and a winter job that follows them carries the full manufacturer warranty. These are the five adjustments that matter on a Calgary roof.
- 01Brittle shingles. Bundles are kept in a heated trailer or garage until they go up, carried flat, and never bent over a ridge or rake cold. Cracked shingles are thrown out, not installed.
- 02Adhesive that will not activate. The factory sealant strip needs sun and warmth to bond. Below about 10°C it stays inert, so the crew hand-seals each course with roofing cement. Without it, the first Chinook gust lifts the tabs before spring ever arrives.
- 03Nail-gun pressure. A cold, stiff shingle is easier to blow through. Crews turn compressor pressure down so nails sit flush with the shingle surface instead of cutting the mat.
- 04A frosty or icy deck. Self-adhered ice-and-water membrane will not stick to frost. The deck is swept dry, and membrane goes down in the warmest hours of the day.
- 05Short days. Calgary gets under eight hours of daylight around the December solstice. Crews open only as much roof as they can close and seal before dark, so no section of deck sits exposed overnight.
03 · Section
Replace this winter or wait for spring? A Calgary decision guide
The question is less whether a winter install works and more whether your roof can safely sit for four or five more months. Snow load, ice dams and Chinook melt cycles all punish a roof that is already failing.
- 01Replace now: active leaks through worn-out shingles. Every melt pushes water into the deck and insulation. Rotten sheathing found in April adds cost that a January tear-off would have avoided.
- 02Replace now: missing or creased shingles across several slopes. Spot repairs on a roof whose shingles have lost their seal tend to fail at the next windstorm. Our wind damage guide explains how to tell.
- 03Replace now: an approved hail claim. Many Alberta policies require the work to be completed within 365 days of the loss for full replacement-cost recovery. A roof hit in a summer storm and still waiting in February is running out of calendar.
- 04Replace now: a home sale or purchase. A buyer’s inspector will flag a failing roof in any month, and a fixed written quote settles the negotiation faster than a spring promise.
- 05Wait: a sound roof getting a planned upgrade. If the roof is dry and holding its shingles, a spring install gives the adhesive strips summer heat to bond on their own and gives you more choice of dates.
- 06Wait: most low-slope membrane work. EPDM adhesives and seam primers carry tighter temperature limits than shingles. Flat-roof leaks get a temporary repair now and full replacement when it warms up. See flat roof repair.
04 · Section
How a winter re-roof runs, step by step
The sequence matches a summer job, with weather checks added at both ends.
- 011. Inspection and fixed quote. A drone inspection photographs every slope without anyone walking on a snowy roof. We don't quote “starting at” prices. Every Calgary quote is fixed, written, and signed.
- 022. Booking the window. We watch the forecast for a run of dry days with daytime highs near or above freezing and moderate wind, then confirm the start date with you a day or two ahead.
- 033. Snow removal and tear-off. Snow comes off first, then the old roof comes off to the deck. We don't roof over existing shingles. Every job is a full tear-off down to the deck.
- 044. Deck inspection. Soft or delaminated sheathing is replaced before anything goes on top of it. Winter is when ice-dam rot along the eaves shows up most clearly.
- 055. Ice-and-water shield and underlayment. Membrane at the eaves, valleys and around every penetration, then synthetic underlayment across the field.
- 066. Shingles. Warm-stored Class 4 shingles, six nails each in the manufacturer’s nailing zone, hand-sealed course by course, with sealed starter strips at every eave and rake.
- 077. Ventilation check. Ice dams start with heat escaping into the attic. Intake and exhaust venting are balanced before the ridge closes. Our attic ventilation page covers the details.
- 088. Cleanup. Magnetic sweeps of the driveway and yard. Snow hides nails, so ask your roofer to sweep again once the yard melts.
05 · Section
Which shingles handle a cold-weather install best
Shingles made with SBS (rubberized) modified asphalt stay flexible in the cold, which makes them easier to handle and less likely to crack on a January roof. Many are also Class 4 impact-rated. We don't install Class 1 or Class 3 shingles by default — Calgary’s hail belt requires Class 4 impact-rated. On winter jobs we lean toward lines built on that chemistry. Malarkey Vista AR uses a rubberized polymer that stays flexible down to about -30°C, and Good Roofing is a Malarkey Emerald Pro Installer. Owens Corning Duration STORM is a Class 4 line we install as an Owens Corning Preferred Contractor. Standard oxidized-asphalt shingles still go on in winter, but they demand more care in handling and benefit more from hand-sealing. Your quote names the exact product line, its impact class and its wind rating. Compare lines on our Malarkey Vista AR and Duration STORM pages.
06 · Section
Winter timing, insurance claims and storm chasers
If your replacement is part of a hail or wind claim, keep the paperwork moving even when the weather does not. Get the adjuster’s approval in writing, book the install, and if cold or snow pushes the date, record the weather hold in writing with your insurer so the delay sits on file before any completion deadline. A tarp or temporary repair to stop further damage is normally part of an approved claim; keep the invoice. Winter also brings a quieter version of the post-storm door-knock. We don't work with out-of-province storm chasers. Only vetted, year-round, locally-licensed Calgary crews. We don't door-knock. We don't pressure-sell. We don't show up uninvited after storms. Before anyone tears off your roof in January, ask for their licence (ours is Alberta Master Roofer License #AB-RM-48201), proof of insurance ($5M commercial general liability + WCB covered), WCB coverage and a fixed written quote. Our roof replacement insurance claim guide walks through the full claim.