For proper drainage the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel.
Best backfill material for retaining wall.
Second a retaining wall must have properly compacted backfill.
Backfill refers to the dirt behind the wall.
When you have built your retaining wall then you will need to add some backfill to the hole in order to shore up the wall and prevent any type of collapse of the underlying structure when you are ready to add your backfill to the hole you should make sure that you have enough suitable material to install in the hole and also take care that you avoid problems such as collapse of the.
For diy purposes opt for manufactured blocks that are.
Screenings otherwise known as fa5 or limestone screenings are a great choice for backfill because it compacts well.
It should be coarse well draining material to help keep the basement dry.
Gravel backfill backfill simply refers to the soil directly behind the wall.
In order to provide proper drainage at least 12 inches of granular backfill gravel or a similar aggregate should be installed directly behind the wall.
Trench back fill tbf 3.
5 best stones for backfill.
Compacted native soil can be used to backfill the rest of the space behind the wall.