They are screwed in without needing pre drilling and hold sleepers very firmly.
Sleeper retaining wall drainage details.
Continue the gravel up to just below the surface at least 100mm thick behind the 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.
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.
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.
Retaining walls sleeper wall details.
However retaining walls are built with a certain capacity in mind.
Why proper drainage is important for retaining wall performance.
The sleepers will need to be pinned through the height to keep them stable lots of different ways to do that.
This is to relieve water pressure on the face of the wall.
Remember to make the sleeper wall with an arm at each end going back into the high bit.
Use an aggi pipe with a 100mm gravel surround maximum stone size of 10mm.
Backfill behind the wall with gravel for drainage.
How to build a sleeper retaining wall.
The sleepers themselves should be built up with staggered joints.
The design of a properly built retaining wall resists the force of the soil behind it and prevents caving buckling or leaning.
Landscaping screws are great for joining sleepers together.
Install a drain behind the wall.