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Felt (roofing)
A layer of fibrous material, impregnated with bitumen, and coated with a layer of bitumen, often with fine
gravel applied to it. Used for covering flat and low-pitched roofs. Multiple layers can be used in exposed conditions, or to give longer life It is a good material if its limited life is accepted, and if is kept in good repair. Because it is impervious, it is important that the under-surface of the supporting material (usually plywood) is well ventilated.
Related Words Bitumen, bituminous
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