Modified bitumen roofing is a popular choice for areas with heavy snow and ice because it combines the durability of asphalt with modifiers that enhance flexibility and resistance to extreme weather. This roofing material often uses APP (Atactic Polypropylene) or SBS (Styrene-Butadiene-Styrene) polymers, making it more resilient to freezing temperatures and the freeze-thaw cycles common in snowy climates. The best modified bitumen roofs for heavy snow and ice generally have excellent waterproofing, strong adhesion, and a reflective surface to reduce ice damming. This prevents water backup, which is a common cause of leaks and roof damage in cold weather. When inspecting a modified bitumen roof after winter, look for cracks, blisters, or loose seams. These signs might indicate the roof's integrity has been compromised by the harsh conditions.
You can safely check your roof’s performance in winter by observing whether snow is melting evenly or forming large ice dams along the edges. Uneven melting might suggest poor insulation under the roof, affecting snow and ice management. Also, check the gutters for signs of ice buildup or overflow. Avoid walking on a snow-covered modified bitumen roof, as it can be slippery and may cause damage. If you notice persistent leaks, internal water stains, or roof surface damage, it’s time to call a professional roofer. When consulting a contractor, ask specifically about the type of modified bitumen used and its warranty concerning freeze-thaw conditions. Also, inquire about the roof’s ventilation and insulation recommendations to minimize ice dam risks. A reputable roofer should be able to explain how their installation meets local snow load requirements and extend the roof’s lifespan in harsh winters.