Built-up roofing (BUR) is made from layers of bitumen and reinforcing fabrics, typically finished with a gravel or mineral cap. This type of roofing is generally durable and provides excellent waterproofing, but its layered construction can present challenges when installing rooftop solar racking. The main concern is that penetrating the layers to anchor solar mounts may compromise the waterproof integrity if not done correctly. Since BUR systems rely on a sealed surface, improper fastening can lead to leaks or damage over time. However, when compatible mounting techniques like ballasted solar racks (which use weight rather than penetration) or specialized flashing and sealants are employed, solar panels can coexist well with BUR roofs. A simple way to check compatibility at home is to inspect your roof’s surface for visible layers and gravel, and note the presence of any existing rooftop equipment that might indicate mounting options.
If you’re considering solar panels on a BUR roof, it’s important to schedule a professional roofing inspection to assess your roof’s condition and compatibility. A qualified roofer can evaluate if your BUR layers are intact and can handle penetrative mounts or recommend the best non-penetrating solutions. When discussing options with a contractor, ask specifically how they will ensure the roof’s waterproofing remains intact after installation and what warranty coverage applies to roof and solar components post-install. It’s also wise to confirm their experience with BUR solar installations and check whether they handle permitting and code compliance related to rooftop solar systems. A thoughtful contractor will address these concerns to prevent leaks and guarantee your roof and solar investment remain protected.