Finally, bear in mind that features vary from one product to the next. Plus, there are environmental variables to consider, such as the solar orientation of your home and the prevailing wind direction. You must account for the size and, more importantly, the shape of your roof. If you’ve got, say, metal roofing, special considerations come into play. Eventually, this trapped, standing water works its way beneath the shingles, causing leaks and, in many cases, extensive (and expensive) damage.ĭe-icing cables are designed for use primarily with the most common roofing material-asphalt shingles. Once this dam has formed, any snow melting on the roof collects and puddles behind it. After repeated freeze-thaw cycles over the course of the season, a thick barrier of ice forms along the roof overhang. Before the melted snow runs off the roof, however, it refreezes right near the edge, over the eaves. Warmed by heat rising up from below, accumulated snow on the roof begins to melt. Ice dams form in winter, in the days and weeks following heavy snowstorms. There are several ways to do this, but homeowners seeking the greatest protection often opt to install de-icing cables along the roofline. Therefore, the key isn’t to eliminate ice dams after they’ve formed, but rather to prevent them from forming in the first place. Often, it’s not until after the damage has been done that a homeowner even becomes aware of the problem. Making the phenomenon all the more menacing is that unlike many other home disasters-a downed tree, for instance-ice dams aren’t obvious threats. Of all the hazards that strike fear into the heart of the average homeowner, surely ice dams must rank near the top of the list.
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