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What #Bobbo said re Type 1, use concrete for brick or block.
You might as well use cardboard as use sheet timber for retaining soil, it will last as long. This is why you don't want soil against your fence in the first place!
ColinTheBald
Trunkie
Sorry missed that first time round.
Any reason not to use alternative timber rather than brick? It’ll only be around 600mm tall and sheet timber will be much quicker than brick and cheaper than sleepers.
For the dpm I meant to retain moisture in the bed, rather than preventing moisture behind it.
And do I need to bed the sleepers on hardcore/concrete to stop them moving?