Built-up roofing (BUR) is a traditional flat roofing system made by layering multiple sheets of roofing felt or fabric soaked in bitumen (asphalt, coal tar, or a similar product), finished with a protective layer of gravel or a reflective coating. This approach creates a strong, durable roof specially designed for flat or low-slope surfaces. It’s well-known for excellent waterproofing qualities and long-lasting protection when installed properly. BUR roofs resist punctures and foot traffic, and the multiple layers add redundancy, so if one layer gets damaged, the roof can still perform well. This system can last 15 to 30 years, depending on factors like climate, maintenance, and materials used. It also provides good resistance against UV rays and weather extremes, which is a bonus for durability.
You might notice early signs of BUR roof issues when you see blistering, cracks, or peeling gravel, often caused by trapped moisture, poor installation, or age-related wear. Simple DIY checks involve looking for bubbled or soft spots on the surface and inspecting for loose gravel, cracks, or exposed felt. If you feel unsure or find anything concerning, it’s best to call a professional roofer to do a thorough inspection. When talking to a contractor, ask how many felts they plan to apply and what type of bitumen is used (coal tar, asphalt, or modified bitumen), as these choices affect durability and compatibility with your building. Also, inquire about warranty specifics—how long it covers the roof and what conditions might void it—to ensure you’re protected in the long term.