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Old 04-26-2013, 09:07 AM   #1
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Radiant floot heat under tile


Hello,
I'm getting ready to install tile in an unfinished space that I'd like to add radiant heat to in the future. First as I understand it typical tile installation would be starting with the sub-floor... OSB->concrete board->thinset mortar->tile.
Now I'm thinking that a better method would be OSB->thinset->concrete board->thinset->tile.
The reason being to remove the air gap that would be present between the OSB and concrete board even when screwed down. Also adding a bit of thermal mass.

See any problems with this logic???
Thanks
Edward
Cold in Maine

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Old 04-26-2013, 11:14 PM   #2
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Radiant floot heat under tile


Edward,

Your first understanding is wrong. All tile backers require a layer of thinset mortar under them. The reason you mentioned is correct. Don't forget the correct fasteners, & special mesh tape. Which one do you plan to use and what type of room?

Jaz

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Old 04-27-2013, 04:35 AM   #3
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Radiant floot heat under tile


Hello JazMan - I've laid tile many years ago and then we did use mortar under the cement board over plywood. This new idea came from the "professionals" at the big orange retailer. The cement board seemed a lot different i.e much lighter, than I remembered so when two guys say with authority to nix to the thinset I had to question. So thanks very much for your input
It's a bed room and I am putting mortar under and even bought enough to do the the job the other day Can always take back unused but man do I hate to come up short
Thanks again,
Edward
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Old 04-27-2013, 07:44 PM   #4
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Radiant floot heat under tile


If by "professionals" you mean experts, be assured you are not likely to find any at those places.

All, every, with no exception, CBU manufacturer tells us we must install a layer of thinset mortar between the subfloor and the board. It's not for bond, it's to fill every little space and to support the panels so there's no movement.

Those two nixing-authority types should read directions.

Jaz
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