If your roof has been replaced after one Calgary hailstorm, you have probably wondered whether the next one will do the same thing. Impact resistant shingles are designed to take hail better than standard asphalt shingles, and in a city that sits in one of the most hail-prone areas in Canada, they have become one of the most common upgrades homeowners ask about. The real questions are what the rating actually means, what it costs, and whether it pays off.
This guide explains how impact resistant shingles are tested, what Class 4 means, what they will and will not protect you from, how insurance discounts work in Alberta, and how to upgrade during a hail insurance claim.
Table of Contents
- What are impact resistant shingles?
- Class 1 to Class 4: what the ratings mean
- Why hail makes this a Calgary question
- Are impact resistant shingles worth it in Calgary?
- Insurance discounts and the old City rebate
- What Class 4 shingles will not do
- Upgrading during a hail insurance claim
- Why Calgary homeowners call Total Exteriors
- Frequently Asked Questions
Key Takeaways
- Class 4 is the highest impact rating: the shingle must survive a 2-inch steel ball dropped from 20 feet without cracking.
- Impact resistant shingles cost more than standard architectural shingles, but they are far more likely to survive typical Calgary hail.
- Many Alberta insurers offer a premium discount for Class 4 roofs; the amount and the proof required vary, so ask your broker first.
- The City of Calgary’s Class 4 roofing rebate ended in 2022, so do not count on it when budgeting.
- During an approved hail claim, you can usually upgrade to Class 4 by paying only the difference in cost.
What are impact resistant shingles?
Impact resistant shingles are asphalt shingles built to resist cracking when they are hit. The most common type uses SBS-modified asphalt, a rubberized blend that flexes and recovers when a hailstone strikes instead of fracturing. Others add a reinforcing layer to the back of the shingle. From the street, most look just like a regular architectural shingle.
The rubberized asphalt has a second advantage in Calgary: it stays more flexible in cold weather than standard shingles, which become brittle. That matters on a roof that goes through dozens of freeze-thaw swings every winter, as our guide to how long a roof lasts in Calgary explains.
Class 1 to Class 4: what the ratings mean
Most impact ratings come from the UL 2218 test. Steel balls of increasing size are dropped onto installed shingles from increasing heights, twice on the same spot. To pass, the shingle can dent or scuff, but it cannot crack, split or tear through.
| UL 2218 rating | Steel ball diameter | Drop height | Roughly comparable hail |
|---|---|---|---|
| Class 1 | 1.25 in (32 mm) | 12 ft | Slightly larger than a toonie |
| Class 2 | 1.5 in (38 mm) | 15 ft | Walnut or ping pong ball size |
| Class 3 | 1.75 in (44 mm) | 17 ft | Golf ball size |
| Class 4 | 2 in (51 mm) | 20 ft | Hen’s egg size |
A steel ball is harder than a hailstone, so the test is demanding, but real hail also falls faster in strong wind and comes in irregular shapes. Treat the rating as a strong comparison between products rather than a guarantee against a specific storm. You may also see FM 4473, a similar test that fires ice balls instead of dropping steel ones.
Why hail makes this a Calgary question
Calgary sits at the southern end of the corridor between Calgary and Red Deer often called Hailstorm Alley. The August 5, 2024 storm caused nearly $2.8 billion in insured damage according to the Insurance Bureau of Canada, making it one of the costliest natural disasters in Canadian history, and many neighbourhoods have had roofs replaced more than once in the past decade.
Each hail claim brings a deductible, disruption and, for some homeowners, rising premiums. That repeated cost is what makes impact resistant shingles worth a serious look here, when they might be a nice-to-have somewhere else. If you are dealing with fresh damage now, start with our guide to hail damage to asphalt shingles.
Are impact resistant shingles worth it in Calgary?
For most Calgary homeowners who plan to stay in their home for several years, the answer leans toward yes. Here is how the trade-off usually looks.
The advantages
- Fewer damaging hits. Moderate hail that would bruise or crack standard shingles often leaves impact resistant shingles intact.
- Fewer claims. Avoiding even one roof claim means avoiding a deductible and weeks of disruption.
- Possible insurance savings. Many insurers reward Class 4 roofs with a lower premium.
- Better cold-weather flexibility. Rubberized shingles handle Calgary’s temperature swings well.
The trade-offs
- Higher upfront cost. Class 4 shingles cost more than standard architectural shingles; on a typical house the difference often runs into the low thousands of dollars, depending on the product and the size and complexity of the roof. Our guide to the cost of a new roof in Calgary covers the wider budget.
- Not hail-proof. Very large hail can still damage them.
- Short ownership horizon. If you are selling within a year or two, you may not see the insurance savings, although the roof can still be a selling point.
If you want even more hail resistance, standing seam metal roofing is another option, although it costs more again and can still dent cosmetically. Our metal roofing service page shows the systems we install.
Thinking about Class 4 for your next roof? Our HAAG Certified project managers can inspect your roof and price a standard and an impact resistant option side by side. Contact us online to book an inspection.
Insurance discounts and the old City rebate
Many Alberta home insurers offer a premium discount when a home has a Class 4 impact resistant roof. The size of the discount, whether it applies to your policy, and the proof required all vary by insurer. Some ask for the product name and an installation invoice or certificate. Call your broker before you choose shingles, and keep your paperwork when the job is done.
You may also have heard about the City of Calgary’s Resilient Roofing Rebate, which paid homeowners up to $3,000 toward Class 4 roofing. That program ran in 2021 and 2022 and then ended; city council voted to wind it down once its funding was used. Council has discussed bringing it back since, so it is worth checking the City’s website before you book, but do not build it into your budget unless it is open.
What Class 4 shingles will not do
- Stop giant hail. Stones larger than the test ball, or hail driven by strong wind, can still crack impact resistant shingles.
- Prevent all marks. Hail can still dent or scuff the surface and knock off granules. Some policies treat purely cosmetic damage differently from functional damage, so read your policy wording.
- Protect the rest of the house. Siding, eavestroughs, windows and vents are still exposed. Our post on whether vinyl siding is hail-damage proof covers the walls.
- Make up for poor installation. The rating assumes the shingles are installed to the manufacturer’s instructions.
Upgrading during a hail insurance claim
The most cost-effective time to switch to impact resistant shingles is when your roof is being replaced anyway. Insurance normally pays to replace damaged shingles with materials of like kind and quality. If you want to upgrade, you usually pay only the difference in material cost and any extra costs the change creates, rather than the price of a whole new roof.
At Total Exteriors, upgrades are available at your request during an insurance restoration. The upgrade is not usually covered by insurance, so we ask for a 50% deposit on the additional cost before the work is scheduled, with the remainder due at completion. Raise it early in the claim so the upgrade can be priced and ordered with the rest of the job. Our hail damage roof insurance claim guide explains the rest of the process, and our insurance claims page explains how we work with your insurer.
Why Calgary homeowners call Total Exteriors
Total Exteriors is a locally owned Calgary contractor specializing in exterior repairs and replacement after hail, wind and storm damage. Our project managers are HAAG Certified for hail damage inspection, several insurance companies have given us approved contractor status, and we back our work with a five-year workmanship warranty.
Our hail damage and residential roofing teams work across Calgary, Airdrie, Rocky View County, Beiseker, Chestermere, Cochrane, Crossfield and Irricana. Whether you are replacing a roof privately or through a claim, we can quote impact resistant shingles alongside a standard option so you can compare.
Make your next roof your last hail claim for a while. Talk to Total Exteriors about impact resistant shingles. Contact us online to get started.
Conclusion
Impact resistant shingles will not make a Calgary roof hail-proof, but a Class 4 rating means the roof is built to survive the kind of hail that sends most neighbourhoods into a round of claims. They cost more upfront, many insurers offer a discount for them, and the smartest time to upgrade is during a replacement you are already doing, when you pay only the difference. If you plan to stay in your home, impact resistant shingles are one of the most practical upgrades you can make in Hailstorm Alley.
Frequently Asked Questions
What does Class 4 mean on shingles?
Class 4 is the highest rating in the UL 2218 impact test. The shingle must withstand a 2-inch steel ball dropped from 20 feet, twice on the same spot, without cracking, splitting or tearing.
How much more do impact resistant shingles cost?
They cost more than standard architectural shingles, and on a typical Calgary house the difference often runs into the low thousands of dollars. The exact figure depends on the product and on the size, pitch and complexity of the roof, so compare written quotes for both options.
Will I get an insurance discount for Class 4 shingles in Alberta?
Many Alberta insurers offer one, but the amount and eligibility vary. Ask your broker before choosing shingles, and keep the product details and installation invoice as proof.
Is the City of Calgary roofing rebate still available?
The Resilient Roofing Rebate Program, which paid up to $3,000 toward Class 4 roofing, ended in 2022. Council has discussed reviving it, so check the City of Calgary website for current programs before you book.
Do impact resistant shingles look different?
Most look like standard architectural shingles and come in similar colours. Your neighbours are unlikely to notice any difference.
Can I upgrade to impact resistant shingles through my insurance claim?
Insurance normally covers like-for-like materials, but you can usually upgrade by paying the difference in cost. Ask your contractor early in the claim so the upgrade can be priced and ordered with the rest of the work.