Retaining walls are the silent workhorses of hillside properties. When they fail, they fail catastrophically — and the cause is almost always water.
Hydrostatic pressure Water accumulating behind a retaining wall creates enormous pressure. A 2-meter wall with saturated backfill carries pressure equivalent to several tons per linear meter.
The drainage layer A properly engineered drainage layer behind the wall eliminates this pressure. The DrenaFast™ system is ideal for this application because it occupies minimal volume.
Membrane + drainage The gold standard combines a waterproof membrane on the wall face with a drainage layer to channel water to a collection pipe.
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