For proper drainage the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel.
Installing french drain behind retaining wall.
When filling the area around the inlet grate temporarily cover the grate to prevent any stones or soil from falling in after installing the french drain.
This video shows you how to properly install a drainpipe behind your wall for prop.
Water that s allowed to build up behind retaining walls can damage a wall or cause it to give way.
The pipe should rest on the same compacted gravel base or concrete footing that supports the wall.
Learning how to build a retaining wall can be fun with these helpful tips.
If you re building a retaining wall add a french drain behind the first course of stones or blocks.
This is so that when water gets into the space it does not become bogged down in soil but instead can flow down the wall to the drains or weep holes.
Typically drain lines are installed at the base of new walls before the soil is backfilled.
Check out this video for some simple instructions on installing a french drain behind an 18 to 24 tall retaining wall before it is backfilled with dirt.