When installing exterior drains and drain tiles, the rigid drains need to be placed in at least 12" of 3/4" crushed stone, then covered with at least 3-4 feet of additonal crushed stone.
Trench walls need to be lined between the dirt and stone with a filter fabric, tar paper, or plastic sheeting to keep silt away from and blocking the drain pipes.
The 3-4' of stone once placed also needs to be covered by a filter fabric, tar paper, or plastic sheeting to keep silt from percolating down into the drain tiles. Only then should the trench be backfilled with soil and sloped away from the structure.
Drain tiles should NEVER themselves be wrapped with any kind of 'sock' or filter fabric since this only leads to premature blockage and failure. |
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