On 04/01/19 06:48, The Natural Philosopher wrote:
On 03/01/2019 20:39, Andy Burns wrote:
Andrew wrote:

if this is a suspended and well ventilated ground floor, then in
your location, with only 25mm of EPS, you are going to lose quite a
lot of heat (and thus money) heating your underfloor space.

Given the 15mm(?) pipe is embedded in the EPS, there's only about 10mm
of insulation below the heating pipe.

yep. This is ok on an upper floor, but its not how I would heat a ground
floor for sure

Modern practice is concrete beams with 6" EPS blocks between, and
another 6" EPS on top with the pipe pegged to that, and then screed or
concrete.

If I had a suspoende firun floor Id lift the floor, put celotex between
the beams, 100% seal it witl foil tape and expanding foam as appropiate
then a system such as described on top...

Yep. More-or-less what was done for our conservatory floating floor four
years ago. Concrete beams with blocks between, covered with screed, and
then 50 mm Celotex. Heating was electric, though - film laid on top of
the Celotex, then 1000 gauge polythene on top of that. Actual floor was
T & G laminate (conservatory has potted plants, so polythene was needed
to ensure any water which accidently got through wouldn't get to the
electrics).

--

Jeff