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That's a really interesting idea. I'm just doing the footings for a slab for a roll-off and have finished preparing the pier hole etc ready for the next step. Because I am sited on shallow soil over tough rock I can't get my holes down more than about 400mm so I have built a 400 x 400 x 400 cube that will be an above-slab extension of the concrete below giving me all up about 800mm of concrete as a base. The pier itself will be some 1400 mm of 8" steel bore casing (as in artesian water bore) I have left over; I had planned to backfill it with concrete at the same time as doing the rest of the concreting for the pier base etc. But now you have made a perfectly plausible case for sand and I'd be really interested to hear what others think of it.
Peter
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