Dictionary of Construction Terminology

Perimeter drain

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Perimeter drain
3" or 4" perforated plastic pipe that goes around the perimeter (either inside or outside) of a foundation wall (before backfill) and collects and diverts ground water away from the foundation. Generally, it is "day lighted" into a sump pit inside the home, and a sump pump is sometimes inserted into the pit to discharge any accumulation of water.