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I also found this in the NHBC docs

Thanks, that makes sense and it clearly states it should terminate at the level of the outside ground - for Aussie homes. Also matches what I'd seen in the UK youtube videos.

Yep, agreed. I think George has hit the nail on the head though in his reply. Think this is two things - radon and damp - being confused/combined.

Ah ok, that makes a lot more sense - thanks. We don't live in a radon area but maybe they're being over cautious. I'll check as you've suggested but logically as the barrier already finishes outside the house as long as it stays there and I don't being it back in we should be good.

Thanks, I understand that part, and will be doing exactly that. However, in addition, it’s been suggested that I should look to link the DPM that is between the hardcore and the concrete with the DPC in the outer wall. I can’t see how to sensibly do this and as far as I have found no one else does.

I am now addicted to these though and watching the rest of the series back to back, thanks :)

Thanks, saw this and some others but none seem to bother about tying the plastic membrane under the slab to anything.

No problem, sorry it wasn't clear. Here is the raft cross section - they're both pretty much the same - and I have membrane between the concrete and the stone: I've been told that the membrane under the raft should tie into the DPC on the outside wall, and the membrane under the floor...

Hi I'm building both a garage and house extension both with raft foundations due to the type of ground we have and nearby trees. I've done the first pour of concrete for the raft and am about to add a ring of blocks around the edge before then doing the second pour to complete the raft...