Interior perimeter foundation drains are designed to collect the water that
enters through the foundation wall or rises to the slab and divert the water away from the
home. Perforated plastic drain tiles are placed
on the interior side of the footer, below the slab. The pipe is covered with a minimum of
6 inches of gravel or crushed stone. The surface water that penetrates
the foundation wall or groundwater that rises to the slab is directed to
the interior drain below the slab where it is captures. The captured water
is then directed to either a storm sewer, dry well
or, if necessary, to a sump pump to be discharged away from the home.
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Generally, the system is only placed next to the one or two walls that experience
the water penetration problems. However, in some severe cases, the
system is placed around the entire perimeter. In addition, to help
prevent sediment from entering and clogging the drain tile, a filter
paper is placed around the pipe (especially the openings) or gravel. |
Interior perimeter drains are often connected to sump
pumps that direct the water to the exterior.
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