On 20/05/2019 16:38, R D S wrote:
I want to overboard a draughty, uneven floor.

And as I could do with raising it about an inch I was thinking about a
thick insulation inbetween.

Then I started thinking about UFH and there are pre-grooved polystyrene
panels that would be ideal.

So just wondering if anyone has any experience of DIY UFH or any
opinions of UFH in general.

If you can only raise the level by 1", your options are very limited.
There's nowhere near enough room for a wet system, so it would have to
be electrical - which would be very expensive to run. Even then, there's
insufficient headroom for a decent amount of insulation.

When we converted an integral garage into a kitchen, we needed to raise
the floor level by 6". We installed a wet system but even 6" was tight
and only allowed for about 3" of insulation in order to make space for a
couple of inches of screed on top of the pipes.
--
Cheers,
Roger
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