Used mostly on roofs with no to very low slopes, tar and gravel roofs, also called built up roof or hot mopped is made by alternating layers of asphalt, tar paper and adhered with molten asphalt. Then a top layer of gravel is applied, some of which gets embedded in the hot asphalt and some stays loose on the surface of the roof. The layer of gravel to help protect the solvents in the asphalt from evaporating in the sun. The gravel is an excellent fire retardant, but it can clog drains and gutters.
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