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Can Ice Dams Cause Roof Damage? How to Prevent & Protect Your Roof From Ice Dams

Can Ice Dams Cause Roof Damage? 

This is a common question that we hear a lot from homeowners throughout New England especially this time of year when you get a mix of freezing rain and snow along with below freezing temperatures.

If you have been wondering, “Can ice dams cause roof damage?” the short answer is yes: ice dams can cause roof damage. In fact, the damage might be even more extensive than you realize as these leaks can seep into your walls and cause mold damage.

The good news is that there are ways to prevent ice dams, even though some are more effective than others. But first, let’s talk about how ice dams form [1] and how to know if you have ice dams.

How Do Ice Dams Form?

Can ice dams cause roof damage

It’s a cold day outside in Massachusetts and you have a lot of snow on your roof. You turn up the thermostat to warm up as the snow falls outside.  Not long later, you start to feel a lot warmer in your home. Hooray! But critical issues with your roof and attic will put a damper on your day with ice dams.

That’s because your attic space is now too warm. Your roof warmed up along with your attic and it’s now melting the snow while collecting in the gutters.  It’s still freezing cold outside, so the water trickles down to your gutter system and re-freezes.  

Ice dams expand and cause shingles to lift and leaks under your shingles and into your home.  Costly damages occur! 

How do You Know if You Have Ice Dams?

How do you know if you have ice dams on your hands? Check out these warning signs below.

Can ice dams cause roof damage

Two Ways To Prevent Ice Dams

1. Roof Ventilation Prevents Ice Dams

Can ice dams cause roof damage


The most effective way to prevent ice dams [2] is by ensuring two critical components are in place for your roof and attic.

Pro Tip:  Seal air leakage areas around recessed lighting cans, electrical cables and vent pipes.

So, how do you properly ventilate your roof to protect against ice dams?

First, you must make sure there is a correct balance of intake and outtake vents to move air through the attic. The diagram below shows how air is brought into the attic by intake vents and pushed back outside by outtake vents.

Can ice dams cause roof damage

Image source: Green Building Advisor [3]

With this intake and outtake process, you can be sure that your attic space remains at the correct temperature.

Two Crucial Types Of Vents Needed To Prevent Ice Dams

How do you know if you have ice dams


  1. Ridge Vents: These vents are outtake vents and installed at the ridge of your roof. The vents push cold air back outside and encourage circulation. 
  2. Soffit vents: Installed on the underside of your soffit, serving as intake vents that bring cold air into the attic.


2. Leak Barrier and Underlayment Prevent Ice Dams

The second reason why ice dams become an issue is because of bad or incorrect underlayment or leak barrier material.

How do you know if you have ice dams

How do you know if you have ice dams

Recap:  If you are wondering, “Can ice dams cause roof damage?” the answer is yes. As you may know, ice dams are a layer of ice that forms at the edge of a roof and prevents melting snow from draining properly. The melting snow seeps back up behind this dam and leaks into your home. If you don’t have proper ventilation, underlayment and leak barrier this can cause ice dams.  This can reak havoc on your home with water damage to walls, ceilings, and insulation. Take these necessary steps to ensure winter doesn’t get the best of your home.

Coastal Windows & Exteriors: The Ice Dam Experts 

How do we know so much about ice dams? After 10 years in business, we are GAF certified roofing contractors [5] who know how to install high-performance roofs! Only 2% of roofing contractors achieve this elite status. Our roofs are engineered to prevent ice dams and all the damage that comes along with them. Don’t let winter get the best of your home…prepare now! Contact us to rid of ice dams for good with new roof installation.  [6]