Underfloor heating advice please

maimee_magic

Hi. I'm wanting to make my conservatory useable this winter and am looking at underfloor heating. It will be laid on the ceramic tiles that are currently there. What I'd like to know is should I put insulating boards down. There's room for the 6mm ones but didn't know if it's worth the extra cost. Thanks for any advice.

Myser

maimee_magic wrote: »

Hi. I'm wanting to make my conservatory useable this winter and am looking at underfloor heating. It will be laid on the ceramic tiles that are currently there. What I'd like to know is should I put insulating boards down. There's room for the 6mm ones but didn't know if it's worth the extra cost. Thanks for any advice.

If the underfloor heating is being installed on top of the tiles, what flooring are you installing on top?

maimee_magic

Ceramic tiles.

maimee_magic

Wondered if I could just use the fastheat primer to insulate. The website says ProWarm™ FastHeat™ is a thermal primer for underfloor heating systems and is recommended for use in areas where the increase in floor height associated with thermal backing board is simply not possible, this can not be used as an alternative to XPS Premium or XPS Standard boards for underwood heating. Or am I better of buying the boards? Anyone know how much difference it will make?

phill99

You would be better off doing the job properly rather than on the cheap. You'll regret it if you don't. .

The old tiles should come up, then lay the correct insulating boards an then retile.

sillygoose

phill99 wrote: »

You would be better off doing the job properly rather than on the cheap. You'll regret it if you don't. .

The old tiles should come up, then lay the correct insulating boards an then retile.

100%

If the existing tiles are stuck directly onto the conservatory slab then the heat from the underfloor heating will be efficiently sucked down through the tiles into the slab which can suck up more heat than UFH can provide! It won't work and it will eat electricity at a huge rate.

Remove the old tiles and work out the thickest insulation layer you can get in with tiles on top and go for that. Every extra millimeter of insulation you put in will repay you many times over in running cost. Mine has 30mm Marmox - proper UFH insulation and is genuinely usable in winter without costing the earth.