Semi-rigid damp-proof courses - Mastic asphalt.

Sunday, January 2, 2011

Mastic asphalt, spread hot in one coat to a thickness of 13mm, is a semi-rigid dpc, impervious to moisture and water. Moderate settlement in a wall may well cause a crack in the asphalt through which moisture or water may penetrate. It is an expensive form of dpc, which shows on the face of walls as a thick joint, and it is rarely used as a dpc.

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