STEP® Roof Deicing 9" (22.9cm) wide radiant heating element is designed to solve problems with snow buildup and ice damming on roofs, valleys and eaves. Make sure to provide proper drainage for the melted ice and snow. STEP® Roof Deicing is protected by a 2-mil chemically, inherently inert and dielectric insulation so that the heating element can be installed under all types of roofing materials, including metal roofs.