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@Polygon
I need to knock up a kind of small retaining wall for a 3M diameter round patio, basically a concrete ring, in to which I can compact sub-base and on to which I can lay a round patio kit. It'll end up partially above current ground level so needs shuttering.
My question is this: will 3mm hardboard be up to the job of shuttering if steaked in place, or do I need to go to something more sturdy (and expensive) like UPVC utility board?