Built-up roofing (BUR) consists of multiple layers of bitumen and reinforcing fabrics, creating a durable, waterproof membrane. It’s known for its excellent protection against water and UV damage, but when it comes to energy efficiency, BUR roofs generally have moderate insulating properties on their own. Because the dark, tar-like surface tends to absorb heat, a BUR roof might increase cooling costs in warmer climates unless reflective coatings or additional insulation layers are applied. The energy efficiency of a BUR roof can be improved by adding a reflective top layer or by installing insulation beneath the built-up layers, which helps reduce heat transfer and keeps your home cooler in summer and warmer in winter.
If you’re inspecting your BUR roof and want to estimate its energy efficiency, look for signs like surface color and the presence of any reflective coatings that may have been applied. You can also check the attic for temperature differences; a hot, stuffy attic might mean poor insulation or heat absorption from the roof. It’s safe to do a visual inspection yourself, but avoid walking on the roof unless you have experience, as BUR materials can be fragile and slippery. When calling a roofer, ask if they recommend adding reflective coatings or upgrading insulation to improve energy efficiency. Also inquire about how new materials or repairs might affect any existing warranties, especially if the roof is older or has layered repairs.