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I'm *slightly* concerned that the fixings have made lots of little holes through the membrane but a screed (or other continuous substrate) should act as a vapour barrier ok.
Also yes, don't have an air and timber sandwich between the pipes and tiles, it won't be effective. It might take the chill off but it would be a bit sad in terms of heat efficiency.
hoefla
UFH going down here today. I was under the impression they'd be using aluminium spreader plates between the joists but they're not doing that and just stapling straight to the insulation and expecting the builder to put some sort of mix in over the top to more accurately dissapate the heat. Not sure the builder knows this yet. Trying to tee everything up with builders and plumbers and getting everyone talking and agreeing to who is doing what is a bit of an art and a good builder is like a conductor in an orchestra. This is my first time having any major work done. Not sure I'd ever be able to cope with a new build or an extension. Plans on all sides seem to constantly be changing.
Have noticed that all trades seem to offer a critique of each others work.