It is the season of ice damns and we have a few on our home at Home Fridays. There are several great articles out there about why they exist and how to prevent them http://www.buildingscience.com/documents/digests/bsd-135-ice-dams/ The primary solution printed is usually stop warming the attic, stop the air flow. All great advise, but useless once the house is built, the winter is upon us and the ice damns are here.
So what are they? Simply put the snow is in a freeze melt cycle – melts off the roof, starts down the roof and then freezes as it gets to the colder edge of the roof or gets stuck behind ice with no place to go. Water is a fickle thing – it wants to travel down with gravity to the path of least resistance. Unfortunatley this does not always mean ‘off’ the roof. It might be down under the shingles as the ice can push up the shingles and create a cavity for the water to flow into. And once it starts that downward path into the house – well it is just a matter of time.
So what to do? You can have the ice damns chipped off the house. Ice is a strong, strong material and a build up can be very costly to remove. Also, chiseling away can damage the roof and gutters that might not currently be damaged. So what do we do at Home Fridays? We inspect the ice damns and watch to see what is happening on the roof as it builds. If the cavities are forming under the shingles and we see water intrusion – we are chipping them out and repairing the roof. We watch the weather to see how much melt we are having. During the intense cold we wait – the activity happens with the melting. The first damage is usually to the gutters which can easily be pulled off by the ice (in some cases the gutters are currently held on by the ice). If only the gutters are damaged – we will still wait and fix those in the spring (or remove them all together). On the roofs we are also looking for valleys or puddling. Some of our roof architecture lends to puddling – and thus ice damns. Again we are watching to see what the ice/water are doing. A well built roof with sufficient underlayments should not allow water intrusion. Of course it is impossible to tell if you have a well built roof when it is under snow.
So what should you do if you have ice damns – keep a very close eye on the outside and the inside area of the attic all around where the ice damns are. At the first signs of water intrusion or puddling get a licensed roofer and or contractor to get the problem corrected. In Central Oregon this is the first time in many many years we have seen any significant ice damns. So the waiting game begins…