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Drainage and Protection

8 terms under Drainage and Protection. Select a term to read its definition.

Capillary Break LayerA coarse gravel layer or membrane that stops ground moisture rising into a slab by capillary action. Composite Drainage BoardA multi-layer prefabricated product that provides both drainage and thermal insulation; installed on basement walls in a single operation. Drainage BoardA dimpled sheet, usually HDPE, that directs water on below-ground surfaces. GeotextileA non-woven synthetic fabric that lets water through but holds back soil; used as a filter layer in drainage systems. Protection BoardA rigid foam (XPS) or bituminous board placed over the membrane to protect it from mechanical damage, particularly during backfilling. Protection ScreedConcrete placed over the membrane to protect it from damage during construction and in use. Roof OverflowAn overflow outlet or scupper that prevents dangerous ponding on the roof if the main drains become blocked. Sump Pump SystemA submersible pump arrangement that removes water collected in a basement sump.

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