Modified bitumen roofing is a popular choice for flat or low-slope roofs because it combines the toughness of asphalt with added modifiers to improve flexibility and durability. However, like many roofing materials, it can suffer from UV degradation over time. UV rays from the sun break down the surface of the membrane, causing it to become brittle, crack, or lose its protective granules. This damage typically shows up as discoloration, chalky residue, or small cracks. A simple way to check for UV damage on your own is to visually inspect your roof for these signs, especially around areas exposed to direct sunlight. Be sure to wear appropriate footwear and safety gear, and avoid stepping on fragile parts of the roof. Using a pair of binoculars, you may also spot trouble spots from the ground if accessing the roof is unsafe.
If you do notice UV damage, it’s important to address it before leaks or bigger problems develop. Some minor wear can be patched with compatible sealants or coatings designed for modified bitumen, which also restore UV protection. For larger or widespread damage, a professional roofer should assess whether a full replacement or a new protective coating is the best long-term fix. When talking to a contractor, ask how they ensure the roofing materials meet your local building codes and warranty requirements, and whether their proposed repairs or coatings will void any existing warranty. These questions help make sure your investment stays protected well into the future.