As a general rule of thumb a third of the size in the ground. Use postcrete to set. I do warn you it’s a beast of an undertaking, here’s my efforts from last year
Firstly, this looks fantastic! Secondly, I've a couple of a couple of questions as I'm planning something similar this summer, albeit the step up between levels in my garden is only about 50cm.
- Did you fix each sleeper to the next? If so, how? Pins? Screws? - Did you do anything different for the curved parts of the wall where the sleepers won't fit snug? Does it make matter that there will be a slight gaps?
Used the occasional screw mainly on the paths. The rest really purely using a lot of postcrete, just need to move fast with it
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