Ask question asked 2 years 9 months ago.
French drain behind wood retaining wall.
We re going to keep the good stones and use them for the rebuild.
Why you need a french drain behind your retaining wall.
Use fabric behind the wall.
Why proper drainage is important for retaining wall performance.
However retaining walls are built with a certain capacity in mind.
Backfilling the space behind the blocks with crushed stone and then installing a flexible perforated drainpipe available at the home depot also called drain tile at the base of the wall.
You want to use a perforated 4 plastic pipe below.
Fabric keeps rock and soil separate.
The design of a properly built retaining wall resists the force of the soil behind it and prevents caving buckling or leaning.
We go about 6 8 deep behind the wall with loose rock usually crushed granite and up to the second row from the top.
The pipe should rest on the same compacted gravel base or concrete footing that supports the wall.
A retaining wall is built to hold back a certain amount of soil.
They are also always lower than the footing of a foundation or wall or stair system.
The stone is just deteriorating.
This loose rock is probably more than other companies would use but we would rather allow more water to flow behind the wall and out than not have enough.
Mar 19 2014 when building a retaining wall lay perforated drainage tubing at the base of the wall slightly above ground level so runoff can drain out without undermining your wall.
We re pulling all this out.
If you re building a retaining wall on a hillside.
French drain below or above retaining wall.
If you re building a retaining wall add a french drain behind the first course of stones or blocks.
Drain pipes go behind the wall on the side with the surcharge the soil that that wall or foundation is holding back.
Drainage problems in your yard can lead to pooling mold or water damage in or around your home.
Otherwise water moving down the hill will build up behind the wall and undermine it.
The proper drainage behind a natural stone wall is extremely important.