woodsmith
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There is not much loading with a shed but it's always a good idea to dig away the loam. If he wants to use this hardcore it needs to be solid and not friable and then well whacked down, it's difficult to see just how big the pieces are but its not a good idea to put a sand binding on top of a coarse hardcore, the sand can migrate through the hardcore over time and leave the concrete unsupported. Best to just lay the concrete directly onto the hardcore.
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