What is an Ice dam? An ice dam is a blockage of ice that forms at the edge of a roof and prevents melting snow (water) from draining off the roof. The water that backs up behind the dam can leak into a home and cause damage to walls, ceilings, insulation, and other areas. <br> <b> Preventing Ice Dams </b> <br> RHS Valley Heater System is one of the best purchases homeowners, contractors, field workers could take against snow accumulation on the roof. Our system will completely clear the most problem areas (valleys) from snow and ice from your roof, without any hassle of using a roofing rake or even using hazardous chemicals like sodium chloride and rock salt that will damage your roof. Our highly efficient system only draws the right amount of energy to melt ice and snow off your roof, saving on your energy bill. Expand the life of your roof and reduce the risks of falls and injuries by installing the best roof deicing system by RHS