Built-up roofing, often called BUR, uses layers of tar and felt to create a sturdy, weather-resistant surface. Over time, fasteners that secure the roofing felt or insulation can begin to back out, meaning they loosen or partially come out from the roof deck. This usually happens due to factors like thermal expansion and contraction, roof movement, or improper fastening during installation. Moisture and wind can worsen the movement, causing the roofing layers to separate or even bubble. To identify fastener back-out yourself, look for blisters, loose roofing material, or visible gaps where nails or screws should be holding the layers tight. If you notice small rust stains, that’s often a sign moisture is getting near the metal fasteners. You can gently press on the roofing surface to check for soft spots, which might indicate the fasteners have loosened or the deck beneath is compromised.
If your roof shows signs of fastener back-out, it’s best to get a professional roofer involved promptly to avoid bigger problems like leaks or full roof failure. While simple checks can be done safely from a ladder or with binoculars from the ground, climbing and disturbance of roofing layers should be left to experts. When you speak to a roofer, ask if the fasteners were installed with proper length and corrosion resistance according to the BUR manufacturer’s guidelines, as using wrong nails can void warranties. Also, inquire if they will inspect the roof deck and surrounding materials because fixing fastener back-out often involves tightening or replacing fasteners and possibly reinforcing the deck. This clear understanding helps ensure the job extends the roof’s life and maintains your warranty coverage.