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-   -   Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway (http://www.diychatroom.com/f5/installing-electric-radiant-heating-pad-tiling-over-concrete-slab-floor-breezeway-130755/)

Carolyn Gray 01-20-2012 04:41 PM

Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway
 
Does the concrete slab have to be insulated, and should the walls also be insulated?

Bob Mariani 01-21-2012 07:43 AM

To reduce the energy costs of operating the heated floor the slab should have 2" foam under the cement and the walls to be insulated to R-19, ceiling to R-38, door to be exterior grade and weather stripped.

Carolyn Gray 01-24-2012 01:42 PM

Installing an electric radiant heating pad on an old concrete slab floor.
 
I should have mentioned that the concrete slab is part of an old breezeway that I am rehabbing. It had asphalt tile on it for about 50 years, and this is now removed. Therefore, I cannot put any insulation under the slab. What kind of insulation can I put between the top of the slab and porcelain tile? I have heard of cork insulation. Is this a good choice?

Thanks.

Bob Mariani 01-24-2012 04:19 PM

no. That will not do, you do not want any flexible surface under the tile. Possible just use an electric heat mat to at least keep the tiles warm

oh'mike 01-24-2012 04:32 PM

Actually,Bob--cork is an approved underlayment for tile---It is used as a sound deadener in apartment buildings under tile---

It is expensive and I doubt the extra cost would add much insulation value.

Call the maker of the heat mat and ask their technical help line---I've never used it under a heat mat--


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