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A Built- Up Roof (BUR)membrane Consists of Several Plies of Felt

Question 29

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A built- up roof (BUR)membrane consists of several plies of felt, where each successive felt is laid over a mopping of asphalt. What does the felt consist of and what is its purpose? What purpose does asphalt serve?

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Asphalt in a BUR ply is the waterproofin...

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