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They didn't use a wooden frame as it's dug down into an existing patio with slabs, so they sort of form the edging for it. The fella levelling it out also used a 6ft level, which isn't as wide as the base, which is why I think the problem has occurred. I hope that makes sense but If they'd used...

Just checked on the concrete and it's still quite damp, but I'm leaving it covered for now. More of a concern is that if I put a 6ft level over it, (total size of the slab being 2.4m x 2.2m) it's pretty flat against the level, apart from 30/40cm in on from one edge. Here it starts to curve...

Update on the concrete base. The area was dug down and a type 1 sub base was laid and compacted. This was still damp so a waterproof membrane was laid down before 150mm of concrete with 2 x wire mesh laid in, one at a 45 degree angle to the other. It seems OK but my only concern now is how to...

Thanks for the replies. The clay is the dense grey/blue variety and there are no large trees within 15m of it. It's not the top soil but it doesn't take much digging down to get to it. The area we live in (Burgess Hill, Mid Sussex) used to have a lot of potteries because of the clay. The whole...

Firstly, I'm loving this forum and very glad I found it. Secondly, after using the search function and reading as many similar posts as possible, I'm still worrying about a problem we've got in our garden. We've been planning on putting a hot tub in our garden and we're in the process of...