"TP" wrote in message
.. .
Electric radiant floor heat. I need to encase this wire in a
lightweight mix to distribute the heat evenly. They suggest a
light weight gypcrete mix. I read a few facts and it looks very
well suited for the hydroic radiant heat systems. I have used
this wire system before in thinset & tile with no problems. This
surface will be covered in a floating wood laminate. Only 150 sq
ft, ½ inch thick. I was thinking of using a cement sand mix
instead of gypcrete. Should I use any additives with it? Oh
yeah, it will be going over an uninstalled concrete slab. They
suggest using reflectix (bubble foil wrap between the mix and
slab. Anyone done this before…?


One problem I see with the reflextix is movement. You put that down and it
won't bond with the slab and may cause breakage of the mix. I don't know of
any solution.

Another thing is the reflectix is not tested for insulating value unless
there is an air space. While it's better than nothing, it's not much
insulating value.

Thanks
TP