We are excavating the old floors in a cottage that is being refurbed, will be installing UFH...
What are peoples thoughts upon simply clipping the PEX pipe direct to the foam insulation, or using the plastic 'egg crate' templates to get a much more even 'lay' of the pipe ??
I've just installed UFH in our extension, it is great!
I just clipped it directly to the foam, using clips supplied. Screeded over with standard screed loaded with fibres to resist cracking.
We (my Wife) worked out on graph paper a suitable layout using the Bifolar layout rather than the traditional Meander pattern, as we felt that this would give more even distribution of heat and we managed to use all the pipe supplied, more or less equally on the two circuits.
Apart from the convenience of just pushing the pipe into notches,I cannot see any advantage in using 'egg crate'.
Because each sheet links to the ones next door, you must avoid starting laying at two separate sites. Very tempting when you are doing more than one room with more than one pair of hands:-)
The other consideration is routeing several circuits from one manifold. The minimum spacing is 100mm so a 3 room system might have a run of 4 pipes going through a doorway/corridor but controlled by thermostats elsewhere.
There's a lot to be said in terms of time saving to use rebar mesh and zip ties. The pipe is liable to want to go anywhere but where you want it to go :-(
It *doesn't* help to locate the pipe - but it *does* mean that any leaks will be apparent, and can be dealt with, *before* the pipe is buried in screed.
The stuff supplied with our UHF kit was about 1/4" thick, yellow stuff slitted along its length so you could part it for different slab thicknesses and with a polythene fringe to stop concrete getting behind it.
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