Torch-down roofing is a type of modified bitumen roofing that’s applied using a propane torch to melt the asphalt, creating a strong, waterproof seal. It’s popular for flat or low-slope roofs and offers excellent durability and resistance to harsh weather, including heavy snow and ice. The key to the best torch-down for such conditions lies in the material’s thickness and the type of modifiers used—SBS (styrene-butadiene-styrene) modified asphalt is generally more flexible and performs better in freezing temperatures compared to APP (atactic polypropylene). This flexibility helps the membrane endure the freeze-thaw cycles without cracking or shrinking, making it a reliable choice in snowy climates. The surface granules or coating can also impact UV resistance and ice adhesion, important for long-term performance.
Diagnosing issues with torch-down roofing under heavy snow involves looking for signs like bubbling, peeling edges, or water stains inside your home, which might indicate moisture is penetrating the membrane. For a safe DIY check, after a snowfall, inspect the roof for large ice dams or heavy snow buildup that could strain the membrane. Clear any debris from drains and avoid walking on the roof unless necessary, as this can damage the membrane. If you see persistent moisture, cracks, or damaged seams, it’s time to call a roofer. When talking to a contractor, ask, “Do you recommend SBS-modified torch-down for my area’s snow and ice conditions?” and “How do you ensure proper sealing around roof penetrations to prevent ice dam leaks?” Both questions help you confirm the right material and installation quality to protect your home during harsh winters.