According to the Standards: Flexible (plastic or rubber) DPC used as a cavity tray should be designed to prevent the downward passage of water or moisture through the tray. Cavity trays should be provided at interruptions to the cavity (e.g. window and door openings. and air bricks) unless otherwise protected. They must meet the requirements of.. A cavity tray should be provided to direct any water that enters the cavity to the outside. The cavity tray should fully protect the opening. At the horizontal abutment of all roofs over enclosed areas and balconies to walls. A cavity tray should be provided 150mm above any adjoining roof or balcony surface.
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Approved Document C requires that to prevent rising damp, a damp-proof course should be: · Continuous with any damp-proof membrane on the floor. · At least 150mm above the level of the adjoining ground or paving level if it's an external wall. · If inside an external cavity wall, the cavity should extend at least 225mm below DPC, or a.. Cavity trays also have to be installed at the bottom of walls, but this will only apply if the cavity does not extend 225 mm below the DPC. Do you need a cavity tray at the DPC level? Cavity trays don't have to be installed at DPC levels. The cavity below the DPC should be filled with concrete up to a level of 225 mm below it.
