All very helpful, thanks, so how about Plan B, I take up the existing
tiles, and lay underfloor heating? If I do, does that have to have some form
of insulation board underneath the cable, or doesn't it make a lot of
difference?


"Nodge" wrote in message
...
I'm not an expert but I would think that if you papered over the foil
behind
a radiator you would be defeating the object of the exercise. From my
school
days heat travels by 3 different ways - radiation, conduction and
convection. Ignoring convection for now, radiation (as applies to
radiators)
is a little like rays of light and can be reflected by shiny surfaces.
This
is why you can put aluminum foil behind a radiator to bounce the heat back
into the room (and why electric bar fires have chrome reflectors behind
the
element to reflect the heat into the room). Papering over the foil would
stop it reflecting (as would burying it under floor tiles). Conduction is
where heat travels through an object. Eg. you put an iron poker in the
fire
and the handle gets hot. This is what would happen if you put the foil
under
the tiles - it would simply conduct the heat through to the surface below.

Nodge


"Broadback" wrote in message
...
The Natural Philosopher wrote:

bill wrote:

I am going to change the ceramic kitchen floor tiles and would like
to
have
included some form of insulation. The gap is only really deep enough
to fit
the tile cement so does anyone know of a type of insulation I might
be
able
to use? I was wondering about a foil roll or something similar if it
exists.

Many thanks.


Pointless unless you can get a couple of inches of polystyrene in
there.

Foil is not insulative., Its conductive. Al is the most conductive
metal
for its weight there is pretty much.

This is not intended to be contentious, just a question. If putting
foil behind a radiator then papering over reflects heat back would not
the same beneath a floor have the same effect?

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