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 Foundation drainage systems are typically needed in buildings with subsurface rooms. Structures built below grade are
subject to water intrusion especially if storm-water or irrigation water is trapped against the foundation with no means of
drainage. One type of foundation drain is the perforated pipe or often referd to as a french drain. The soil is
excavated from the foundation & a perforated drain pipe fitted with a filter sock to prevent dirt from clogging up the
holes is installed. The pipe is surrounded by pea gravel on all sides & is piped to daylight.
Multi flow is also used as a foundation drain. Here it is installed against a foundation & is surrounded by coarse sand.  |
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