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No probs! Thanks to both you and Hendrax - 3 or 4 other people have pm'd me concurring, so it's looking like a good general consensus!

Yeah it's possible.. 4" was the outer limit. I suspect it will likely be a bit thinner than that. My research suggested about 0.49 m cubed but I was struggling to work out how many physical bags of sand and cement that equates to

Hot tub base

Brilliant- many thanks for your help.

Yes, and I feel I'm relatively on the ball in life, but having looked online tonight I can't quite find the answer I'm looking for, so I thought I'd ask the friendly and often helpful people of NSC as in the past it has proved fruitful. So unless you can offer some help to the thread, please do...

Dear NSC building experts... I want to lay a concrete slab 8ft x 8ft x 4" deep of concrete over a gravel base (already in place) How many bags of sand and cement will I need please? Thanks in advance!