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Old 01-20-2012, 03:41 PM   #1
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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?

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Old 01-21-2012, 06:43 AM   #2
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Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway


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.

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Old 01-24-2012, 12:42 PM   #3
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Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway


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.
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Old 01-24-2012, 03:19 PM   #4
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Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway


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
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Old 01-24-2012, 03:32 PM   #5
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Installing an electric radiant heating pad and tiling over a concrete slab floor of a breezeway


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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