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The physical insertion method of providing a new DPC has been used to solve a water-penetration problem at roof level in a modern multi-storey building. The original cavity tray membrane was of poor quality and had become ineffective. Dampcoursing's solution was to insert a spring-back canopy tray in the wall, one brick course higher than the failed original cavity tray membrane. A zinc external flashing was also inserted and dressed vertically down the external wall surface to overlap the original asphalt upstand.

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