How Ice Dams Can Damage Your Roof


What are Ice Dams?

Ice dams are build-ups of ice near the edges of your roof that form when snow melts from the heat inside your home and refreezes. The melting and then freezing of snow, usually near your eavestroughs or gutters, forms an ice damn that prevents further melting snow from draining off the roof. This water can get under shingles and expand as it freezes, pushing up your roofing materials and causing roof leaks and other damage.




What Causes Ice Dams?

Ice dams form when a snow on your roof melts from the internal heat of your home and then refreezes when it reaches the cold air, usually at the end of your roof near the eavestroughs. The top layer of snow acts as an insulating barrier that traps heat from your home and melts some of the snow closest to your roof. 

Ice Dam Prevention

In Calgary, we can’t do anything to stop large accumulations of snow from building up on our roofs short of clearing the roof after heavy snowfalls. For safety, reasons we don’t recommend climbing on your roof in any weather conditions. It is especially hazardous when it is covered with snow and ice. 

A roof rake can be used to remove some of the snow from ground level, and it may help prevent ice dams from forming. However, ice dams will form where water reaches cold air. Raking only part of your roof, can just cause ice dams to form higher up on the roof. The entire roof needs to be cleared to effectively prevent ice dams. Complete clearing of your roof is not always practical or safe. 

While snow on your roof is a key factor in the formation of ice dams, the real problems are generally inadequate attic insulation and poor attic ventilation. A well insulated attic will minimize the heat escaping from inside your home and make ice dams much less likely to occur. 

Proper attic ventilation will also allow any heat in the attic to freely escape. A good roof includes quality soffit and fascia, eavestroughs, penetration barriers and adequate ventilation. Icicles hanging from your eavestroughs or walls of your home are often a sign of ice dams forming.

Metal Roofing is the ultimate precaution against ice dams. The extra insulation qualities, weather resistance and reduced snow accumulation of metal roofing all aid in preventing water leakage in your home. Nothing is more durable, weather resistant and long lasting than a properly installed metal roof. 



With the exception of commercial and flat roof projects, we are currently quoting residential projects to commence in 2021. Thank you for your understanding. 

Tony William Roofing & Exteriors Inc.
 Suite 300 - 160 Quarry Park Blvd SE 
Calgary, AB T2C 3G3 Open M - F | 8:00am - 4:00pm 

Has your Roof been Compromised by Ice Dams?

It can be difficult to spot roofing damage from ground level, particularly if your roof is still covered in snow. However, some damage may be visible.

On the next clear day, move away from your home and look at the shingles near the edges of your roof. Are there any signs of damage? Do some shingles appear pushed up? Are any shingles warping or curling? If you suspect that you have any roofing problems, give us a call at Tony William. We’ll be happy to offer a no-obligation inspection and quote.

Any signs of water leaks on the interior of your home or even exterior walls show that your roof has likely been damaged and should be repaired or replaced in a timely manner. You don’t want further water damage and possible mould risking your families health.

Get your Roof Diagnosed by Roofing Professionals

Feel free to give Tony William Roofing & Exteriors Calgary a call. We’ll be happy to answer any questions you have and offer a no-obligation inspection and quote.Your roof may be perfectly fine. If it is damaged, it is best to remedy the situation as soon as possible. Waiting until spring to begin roofing repairs can expose your home to extensive water damage.


  • Company was recommended by a neighbor. I had estimates by two companies.Tony Williams was well under Gutter Doctor. Work was completed when promised. Crew was friendly and efficient. I would certainly recommend this company.

    David Ritch

    Google Review

  • We were very impressed with the service and workmanship Tony Williams Roofing & Exteriors provided us this past spring. We will be contacting them for any further renovation project we may have in the future.

    Rick in Calgary

  • This company came in as the best value for our money, they were on time, professional and answered any questions we had. The workers were great, cleaned up after and were done on time. Was very happy with this company!

    Kara & Brad

Read More

CALL US TODAY (403) 454-1366


Find us on:

Tony William Roofing & Exteriors Inc.
Suite 300 - 160 Quarry Park Blvd SE,
Calgary, AB T2C 3G3

(403) 454-1366

Calgary | Airdrie | Langdon | Okotoks

© 2023 Tony William Roofing & Exteriors. All rights reserved.