Ice Dams: They’re a bit different in the sunny SoCal mountains!
Most information about ice dams comes from far different climates than normally found in the beautiful mountains of Southern California. At 7,000’, we have far more sunshine than most locations, in fact our average of over 300 sunny days per year makes Big Bear Lake one of the sunniest places in the country, if not on earth! No wonder SoCal’s best kept secret is not so secret any more. Read on to find out how that sunshine can effect ice damming on your Big Bear cabin.
If you’ve read my WordPress blog from 2009 about ice dams, you already know that they can damage the structural integrity and value of your mountain home (see http://licensedhomeimprovement.wordpress.com/2010/02/22/ice-dams). Most information about ice dams cite poor insulation as the main cause, and in most places this is true. Because of Big Bear Lake’s unique combination of latitude and altitude, we experience far more sunshine during the winter months than most places that get snow. Even in freezing temperatures, the sun will melt the snow on your roof, particularly when the darker colored roofing material becomes exposed to the sun. The snowmelt makes it’s way down the slope of your roof, cooling as is travels under the cold white snow. By the time it reaches the eave, the sun may have dropped below the horizon, at which time the snowmelt is likely to re-freeze into ice. Over several days or weeks time, the ice at the eave continues to accumulate, creating a very effective dam, then a pool of water will build up behind it. Even with code compliant ice dam protection material installed under composition roof shingles, I have seen water back up so far that it finds it’s way through the shingles and into the structure of the house.
In addition, because Big Bear is situated in the heart of temperate SoCal, some home designers and builders are not aware of the potential problems more common in colder parts of the country. Many local roofs have design features that are inadequate for properly draining a roof in snowy environments. The well-meaning friend / handyman that chops the ice off the roof for you may add to the problem by damaging the roof material at these critical locations.
As I write this in the middle of January 2012 (so far a very mild winter), I have already been called out to look at several ice-dam situations. Sadly, most are after the homeowner had paid to fix the problem in past years. It’s not easy to tell a homeowner that the handyman repair they paid $2,000.00 for last year must be torn off to properly fix the problem.
Besides eaves, areas to closely watch are valleys, crickets, and places where roofing material meets siding material (such as 2nd story roof-to-gable transitions). If you see snow building up at certain locations on your roof, there is a potential problem. If you had pine needle accumulations in the fall, they are likely to collect snow too. The best time to look for potential problems is at the end of summer. As a general contractor, we are licensed and experienced at replacing and repairing roofs, as well as performing all other construction trades. We’re happy to come take a look and provide a free consultation for any of your maintenance and home improvement projects. Call us at (800) 926-0409, or contact us through our website, www.licensedhomeimprovement.com.









