Use an aggi pipe with a 100mm gravel surround maximum stone size of 10mm.
Sleeper retaining wall drainage details.
Continue the gravel up to just below the surface at least 100mm thick behind the wall.
Brian ashworth june 10 2013.
Landscaping screws are great for joining sleepers together.
Remember to make the sleeper wall with an arm at each end going back into the high bit.
A retaining wall is built to hold back a certain amount of soil.
The second way to build a sleeper wall is to stand them vertically a vertical walls means you can vary the height of it in different places and even create a curved rather than straight wall.
These walls are the tie back and crib generally used when the wall has to be higher than 0 9m 3ft although not limited to.
Logs or sleepers both fixed in by posts while on the other hand the open face walls have gaps in the face basically for drainage.
The new wall is going to block the natural drainage down the slope so level 50 mm wide gaps between the sleepers along the bottom course and put a length of perforated drainage pipe behind the sleepers and cover it with gravel to stop it blocking up with soil and roots.
Backfill behind the wall with gravel for drainage.
However retaining walls are built with a certain capacity in mind.
They are screwed in without needing pre drilling and hold sleepers very firmly.
How to build a sleeper retaining wall.
Retaining walls sleeper wall details.
The design of a properly built retaining wall resists the force of the soil behind it and prevents caving buckling or leaning.
The sleepers themselves should be built up with staggered joints.
Install a drain behind the wall.