Why do so many commercial property owners choose 2-ply SBS torch-on for their Edmonton flat roof installation? This guide explains how the system works. A base sheet provides the first waterproofing layer, and a granulated cap sheet protects against UV and hail. Two layers mean that if the top layer is damaged, the building is still protected. Learn why SBS performs so well in Edmonton's cold winters and hail-prone summers, and why trained, certified torch crews are essential for a safe, long-lasting installation.