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Old 11-08-2008, 12:56 PM   #16
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Thinset under Hardi backer


i have since read that if you use plywood it should be exterior grade.

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Old 11-08-2008, 02:07 PM   #17
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Thinset under Hardi backer


True it should be Exterior Glue Plywood.(EGP) All this does is help hold the laminated layers together while the moisture from the thinset expands the wood and then when the thinset dries the wood layer shrinks back to size. Think about the stress put on the layers of wood and thinset as they go in one direction and then return to hopefully the original position.
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Old 11-08-2008, 04:08 PM   #18
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Thinset under Hardi backer


Read the tile mfgr's. instructions for proper backing. I'll bet not one lists plywood as an acceptable substrate for tile.........you'll void any warranty if you don't follow the recommendations.
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Old 11-08-2008, 04:29 PM   #19
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Thinset under Hardi backer


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Originally Posted by bjbatlanta View Post
Read the tile mfgr's. instructions for proper backing. I'll bet not one lists plywood as an acceptable substrate for tile.........you'll void any warranty if you don't follow the recommendations.
Most support exterior grade, but interior or OSB is not recommended.
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Old 11-08-2008, 05:18 PM   #20
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Thinset under Hardi backer


I stand corrected, I would have thought cement board was the standard........that's what I get for thinking.
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Old 11-08-2008, 08:01 PM   #21
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Thinset under Hardi backer


All this hassle.....

Come on you guys just use Ditra!

One little tidbit of info that might interest you is:If you do not damp mop the hardibacker prior to the tile install and the floor fails:
You have no warranty!

And....... they can tell if you a have done it the right way!

Betcha ya did'nt know that!
Don't feel bad most people don't know.

Use Ditra! It solves all these issue.
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Old 11-08-2008, 09:09 PM   #22
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Thinset under Hardi backer


I checked out the Ditra website and it is an interesting product. A little video showing it may be a very easy product to work with.
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Old 11-09-2008, 03:05 AM   #23
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Thinset under Hardi backer


"I'm wondering if you have to let the thinset dry before you screw down the Hardi backer? And is there a right and wrong side to the Hardi backer?" Answer to your question: don't let it dry,yes there is a wrong and right side,you cann tell which side goes... common sense

Last edited by detroitMi; 11-09-2008 at 03:07 AM.
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Old 11-09-2008, 11:57 AM   #24
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Thinset under Hardi backer


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Originally Posted by detroitMi View Post
"I'm wondering if you have to let the thinset dry before you screw down the Hardi backer? And is there a right and wrong side to the Hardi backer?" Answer to your question: don't let it dry,yes there is a wrong and right side,you cann tell which side goes... common sense
Maybe you CAN tell which side goes...but why would someone ask if they already knew?

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