Picturesque snow-capped houses are charming, but don't be fooled by their delicate beauty. Snow has a great deal of weight, and that weight increases immensely when rain, ice and sleet are added to the mix. Two feet of snow on the average-sized roof can be the equivalent of 38,000 pounds, or 19 tons. All of this weight puts stress on your roof and weakens its structure. Complicating matters more, the melting of this mass can cause water seepage, which can rot roofs, destroy insulation, flood attics, ruin gutters and damage the interior of your home.