Retaining Wall Drainage


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Old 01-30-17, 04:50 AM
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Retaining Wall Drainage

Will installing a French drain behind a retaining wall provide a benefit?

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Old 01-30-17, 05:49 AM
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It is recommended to install drainage and crushed stone backfill behind a retaining wall. You line the area with geotextile fabric [edit] lay in drainage pipe, and fill with crushed stone to 6-12 inches below surface, then wrap the fabric over and finish with soil.

The drainage prevents water from draining through the wall, taking soil with it. It's especially important in freezing climates so that damp soil behind the wall doesn't frost heave and push the wall forward.
 

Last edited by CarbideTipped; 01-30-17 at 07:44 AM.
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Old 01-30-17, 06:06 AM
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.... and you want that drain tile to have an exit for the water it collects.
 
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Old 01-30-17, 08:45 AM
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A lot depends on what you are building.

I currently have several bolder walls, from 18" up to 4' tall and did not install any drain or use any fabric without any concerns.

In an prior house I had a ravine setting and had multiple 4' high walls stacked up close to 20'. In those I installed inter connecting drain tile from top to bottom.

I'd also be more inclined to put a drain tile behind a paver stone type wall where the wall is a little more straight, if my bolder walls move a bit you would not even notice.
 
 

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