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UFH needs a screed poured over the pipes to encapsulate them. You'll need to wait weeks before tiling onto the screed. You can get quicker drying screeds for more money.
Has anyone done a heat loss calc for the room? Probably fine if it's a kitchen, but if there are three external solid walls and no insulation under the UFH pipes that room will never be warm. You may be able to mitigate some of this by reducing the UFH pipe centres to an absolute minimum. Plumber will moan but in a space that size it'll take an hour, and you only get to do it once. The joists may get in the way but a snail pattern allows for tighter spacing without 180ยบ tight turns.
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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.
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dbr
hoefla
@user67526
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.
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