Calgary weather does not do anything halfway. A chinook windstorm can strip a ridge in an afternoon, a short hailstorm can bruise every slope on the block, and wet spring snow can push water into places a roof never sees in July. Here is what storm damage looks like, what to do first and how a proper storm repair is done.
What storms do to Calgary roofs
Storms damage Calgary roofs in four main ways: wind lifts and tears shingles, hail bruises and fractures them, heavy snow loads and backs up water, and branches punch through. Each leaves a different pattern and needs a different repair.
Wind and chinook gusts
Wind damage starts at the edges and high points. Gusts get under a shingle, break the adhesive seal strip and bend the tab back. Sometimes the shingle tears off; more often it creases along the nail line and settles back down looking almost normal, then lifts again with every gust. Ridge caps peel away along the peak, starter shingles let go at the rakes, and step flashing can be pulled loose, opening a path for wind-driven rain. Chinook winds can blow for days, so a few lifted tabs after one storm can become bare underlayment by the next.
Hail
Calgary sits in Canada’s most active hail belt, and hail damage is often invisible from the street. Hailstones bruise the asphalt, knock granules off and can fracture the fibreglass mat inside the shingle. Metal vents, flashing and pipe caps take visible dents, a useful clue that the shingles were hit too. On older low-slope roofs, large hail can puncture a brittle membrane outright. For repair purposes, what matters most is how widespread the damage is.
Heavy wet snow and drifting
Spring and fall snow in Calgary is often heavy and wet. It loads low-slope sections, garage roofs and valleys, and wind drifts it deep against walls and dormers. As it melts and refreezes, water can back up under shingles at the eaves or sit on a flat roof seam until it finds a way in. This damage usually shows up as a leak, not something visible on the roof.
Falling branches and debris
A limb that comes down in a windstorm, or under the weight of wet snow, can crack shingles, split sheathing or punch straight through the deck. Punctures are the most urgent storm damage, because the roof is open to the next rain.
Signs of storm damage after the weather clears
The surest signs of storm damage are shingle debris around the house, missing or lifted pieces on the roof, dented metal and new water stains inside. You can check all of these without a ladder:
- Shingle pieces, granules or ridge caps in the yard or on the driveway.
- Dark patches or exposed underlayment where shingles are missing.
- Tabs that look raised or wavy, especially along the roof edge and ridge.
- Dented vents and flashing, or hail marks on siding, window screens and the barbecue.
- Bent or loose flashing at chimneys, sidewalls and skylights.
- New ceiling stains on upper floors, or wet insulation in the attic if you can check safely.
What to do after a storm
After a storm, put safety first, document everything, stop water getting in and get a roofer’s assessment before making decisions.
- Stay safe. Keep clear of downed power lines and hanging branches, and stay off the roof. Damaged shingles and wet decking are slippery and may not hold weight.
- Take dated photos. Photograph the roof from the ground, debris in the yard, dented metal, the attic and any interior damage.
- Protect the inside. Catch drips, move belongings and keep receipts for temporary protection such as a tarp.
- Do not sign at the door. Take a business card, but commit to nothing while crews are canvassing the neighbourhood.
- Get an assessment before calling your insurer. Knowing the real extent of the damage helps you decide whether a claim makes sense.
How we repair storm damage
A storm repair closes the roof up first, then rebuilds each damaged component so it performs like the rest of the roof.
- Secure the roof. If the storm left an opening, a tarp or temporary membrane goes on first.
- Replace damaged components. Torn, creased and fractured shingles come out, the underlayment and deck are checked, and soft or split sheathing is replaced.
- Match the existing roof. New shingles are chosen for the closest available profile and colour, then woven into the existing courses with correct overlaps and nailing.
- Re-seal lifted shingles. Lifted shingles that did not tear can often be sealed down again. Sealant needs about 5°C to set, so in cold weather they are hand-sealed or rechecked on a milder day.
- Rebuild flashing and vents. Loose flashing is refastened or replaced and lapped properly, and dented vents and pipe caps are swapped out.
- Document the work. You get photos and notes of the damage and the repair for your records and your insurer.
Repair after a storm or replace the roof?
Repair is right when storm damage is limited to part of an otherwise sound roof; replacement makes more sense when the storm hit most of the roof or the roof was near the end of its life.
| Situation after the storm | Usually repair | Usually replace |
|---|---|---|
| A handful of shingles or ridge caps blown off | Yes | |
| Lifted flashing at a wall or chimney | Yes | |
| Branch puncture in one area of a sound roof | Yes | |
| Hail bruising on one slope only | Yes | |
| Widespread hail bruising across most slopes | Yes | |
| Asphalt roof around 15–20 years old with new storm damage | Yes | |
| Shingles too brittle to repair without cracking | Yes |
Asphalt shingles in Calgary typically last about 15 to 20 years, so an older roof hit by a heavy storm often costs more to keep patching than to replace.
Calgary’s storm calendar
Each season in Calgary brings its own roof-damaging storms, so what to look for depends on the time of year.
| Season | Typical storm | Roof damage to look for |
|---|---|---|
| Summer (mostly June–August) | Hail in Canada’s most active hail belt | Bruised or fractured shingles, granule loss, dented vents |
| Fall | Strong winds and early heavy snow, as early as the third week of September | Lifted shingles, snow load on low slopes |
| Winter | Chinook windstorms and melt cycles | Creased or torn-off shingles, peeled ridge caps, ice-related leaks |
| Spring | Chinook gusts and wet heavy snow | Wind damage, backed-up meltwater, snow load on garages |
Storm damage and insurance, briefly
Many home insurance policies cover storm damage to a roof when it was sudden, such as hail, a windstorm or a fallen tree, but not damage from age or wear.
- Document early. Dated photos of the roof, yard, attic and interior support any claim.
- Prevent further damage. Insurers expect reasonable temporary protection, so keep receipts.
- Roof age matters. Under about 15 years, an insurer may pay for a full replacement minus your deductible; from 15 to 25 years, the payout is typically depreciated by 50–80%; over 25 years, it may be actual cash value only, or denied.
- Policies vary. Coverage, deductibles and reporting deadlines differ, so check yours.
What affects storm damage repair cost
Storm damage repair cost depends on what the storm damaged, how much of the roof it affected and what it takes to reach and match it. The main factors are:
- Type of damage. Sealing down lifted tabs is smaller than replacing a slope of hail-fractured shingles or a punctured deck.
- Extent. One corner versus several slopes changes the scope a lot.
- Deck and underlayment. Split or soaked sheathing must be replaced before the roof is closed up.
- Matching. Older or discontinued shingles take extra work to match.
- Access and pitch. Steep slopes, tall walls and tree cover need more setup.
- Weather. Tarping, snow clearing and cold-weather sealing add time.
For more on what moves repair pricing, read our Calgary roof repair cost guide.
Making your roof more storm-resistant next time
The best way to make a Calgary roof storm-resistant is to build it for wind and hail when it is replaced. A few choices make a real difference:
- Class 4 impact-rated shingles. Class 4 is the top UL 2218 rating, tested against steel balls up to 2 inches.
- Proper nailing. Nails in the correct zone, in the right number, keep shingles down when a chinook tries to peel them back.
- Starter strips at the eaves and rakes. Sealed starter shingles stop wind getting under the first course, where wind damage usually begins.
- Sealed ridge caps that stay put along the most exposed line of the roof.
- Secured flashing that will not lift and funnel rain into walls.
If your roof is aging but not ready to replace, roof restoration can tighten up loose details before the next storm season.
Related roof repairs
Storm damage often overlaps with other repairs, and our Calgary roof repair services page covers the full range. If a storm left the roof open or water is pouring in, go straight to emergency roof repair. For hidden water entry after a storm, see roof leak repair; for torn and lifted shingles, shingle repair; and for low-slope roofs hit by snow load or hail, flat roof repair.
Ready to find out what the storm left behind? Book a free inspection or contact us and tell us what you are seeing.