It is the time of year that the freeze thaw cycle of warmer days and cold nights still well below freezing can cause significant damage. Melting snow that runs down a warm roof hits the colder eaves (colder because they are not over a heated living space) and freezes. As the amount of ice builds up, the water running down the roof can build up or dam, and push its way back under the shingles and into the house or down through the eaves or outside walls. Roof valleys can be particulary troublesome. Another place ice build up can create problems is in rain gutters and downspots for similar reasons. There are several ways to prevent or counteract icing damage potential; important in the arsenal is regular observation of potential trouble areas and deal with problems as they occur before they become bigger problems.
