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Edward

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Posts: 7
Reply with quote  #1 
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

Edward

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Posts: 7
Reply with quote  #2 
I'll answer my own question  I believe the couple "professionals" at the big orange home store were wrong. There should be thinset below the concrete board. I've done it this way before but was thrown off by how light weight the concrete board is these days, it can even be cut with a utility knife Wow does that make laying it out easy!
So the concrete board is bedded in thinset, YEAH!!! 24 hours and tiling begins.
Edward
Still cold in Maine, but it looks like spring is finally here 62degF today
Scott Davis

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Posts: 697
Reply with quote  #3 
Thanks for the update and good information Edward!
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Take care, Scott MD
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