How deep should 1st sleeper be below ground level for a wall
Hi.
I'm hoping someone can offer some assistance please.
I have a front driveway which is approx 14m x 14m.
It is currently on a slope and I am planning to build a retaining wall with oak sleepers.
The wall will be 1.1m high and will be 2 tiered, like steps.
I am going to have 2 trenches for each wall with a horizontal sleeper used as posts in concrete behind each wall.
In the trench will be DPC material and then some form of aggregate with then concrete added to make a flat base.
I want to sit the sleepers on their narrowest side, 100mm.
I have drawn a very rough diagram to illustrate this.
My question is how deep should my trenches be and how much of the 1st sleeper should be below ground level?
Also, if the diagram makes sense, please feel free to offer me any guidance, or let me know I'm on the right track(!).
I will also be laying a French drain behind both walls leading to a dry well at either end of the wall.
I hope the above makes sense!
Sonia
MBH Carpentry and Joinery Ltd.
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