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yeah fair. I just know that if I didn't they'd definitely ask me to prove it's fine Appreciate the info guys, thank you

Is it sensible to lay a thin layer of sand over the blinding to make sure the PIR sits flat? The current joists are built off a sleeper wall built off the blinding slab, so the slab is already taking the full weight off the flooring and foot traffic etc. So surely this is an obvious solution...

I can't tell if it's actually that simple or you're joking?! Obviously there needs to be a DPM below the insulation, but I guess that works. What happens with the air bricks etc?

I've got exactly the same situation almost. 100mm joists ~ 300mm centres and about a 150mm gap under the joists before a 120mm concrete slab Was going to nail some supports under the joists for 75mm PIR, followed by 25mm pug mix with UFH Did you get round to doing this, or did you go with a...