Built-up Roofing
Built-up roofing, also known as BUR or tar and gravel, is a reliable, cost-effective roofing system that has been used for well over one hundred years in the construction industry. It is widely known for its durability, versatility, and resistance to water, UV rays, fire, extreme temperatures, and harsh weather.
A BUR is usually made by building up at least three layers of different roofing materials on top of each other. This system is designed so that each layer is applied one at a time with the next one being heated and rolled onto the previous layer. The first layer is a base sheet that is usually mechanically fastened with screws and washers. Then, subsequently, other layers are built up on top by alternating layers of bitumen, also known as tar or asphalt, and reinforcing fabrics such as fibers and felts, thus creating a strong and durable bond and waterproof membrane barrier. To top it all off, the final layer is typically ballasted with a layer of gravel or mineral granules to provide added protection from the elements.
Also, for those living in areas prone to wild fires, or for those who want a shingle requiring lower maintenance and whose color won’t fade over time, you might want to consider opting for out synthetic and composite version instead.