A built-up roof (BUR), sometimes referred to as a tar and gravel roof, is a long-lasting and weatherproof roofing material that is frequently applied on low-slope or flat roofs. It is made up of several tar layers, reinforced with fiberglass or roofing felt, and, for further protection, completed with a coating of gravel. Visit: https://managemyroof.com/tar-and-gravel-roof/
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