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Tar and gravel roofs, also known as built-up roofing (BUR), are a durable and cost-effective option for flat or low-sloped roofs. They consist of multiple layers of bitumen (tar) and reinforcing fabrics, topped with a layer of gravel. This design provides excellent waterproofing and UV protection. Tar and gravel roofs are known for their longevity, often lasting 20-30 years with proper maintenance. However, they can be heavy, and repairs may require specialized skills. These roofs also tend to absorb heat, which can increase energy costs. Regular inspections and maintenance are essential for optimal performance.