On 20/05/2019 21:27, R D S wrote:
On 20/05/2019 19:49, The Natural Philosopher wrote:

First though is te floora groud floor. 1" of insulation is not enough
for a ground floor. 6" minimumum


It is a ground floor, is that right? That would be disappointing, though
I can see the danger of heating the space under the house.

Ah. You didn't mention it was a suspended floor.

Lift it, and put 6" celotex between the joists, tape over, and then lay
your pipes on top

No need for poly ,poulding. Just use big plastic staples to located them
to the celotex If the joists are stable you can screed/tile or else
overboard with ply and engineered wood.

Aim for a spacing of around 4" between pipes to get best output.

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