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Old 07-23-2012, 12:23 AM   #1
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Can I use Georgia Pacific Platinum Plywood 15/32" Exposure 1 Sheathing 4 ply between hardibacker and 23/32" advantech subflooring for additional support for porcelain tiles???

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Old 07-23-2012, 10:03 PM   #2
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Originally Posted by GoFiNs!
Can I use Georgia Pacific Platinum Plywood 15/32" Exposure 1 Sheathing 4 ply between hardibacker and 23/32" advantech subflooring for additional support for porcelain tiles???
That should be fine, I'd prefer A/C or B/C ply, but you have enough ply for tile that's like 1/2" or 3/4" just offset your seams from ontop of the advantech on the second layer & yes run them both perpendicular from joists.

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Old 07-24-2012, 12:52 AM   #3
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Ok my tile is 1/4' thick. Is that enough for that sized tile. Also I went ahead and started with the extra plywood but I laid them perpendicular to the advantech subfloor. Is this a problem. Just thought I needed to run additional plywood perpendicular to subfloor and hardbacker perpendicular to additional plywood.
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Old 07-24-2012, 06:33 AM   #4
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Quote:
Originally Posted by GoFiNs!
Ok my tile is 1/4' thick. Is that enough for that sized tile. Also I went ahead and started with the extra plywood but I laid them perpendicular to the advantech subfloor. Is this a problem. Just thought I needed to run additional plywood perpendicular to subfloor and hardbacker perpendicular to additional plywood.
Will hardibacker doesn't require to be run in a certain direction because it hold no structure for tile it just a filler to bond and hold your tile down.

The tile guys on here will tell you to run both layers of ply perpendicular from joist and the second layer overlapping the 1st ply seem at least a foot, it all has to do with face grain.
Now I have run the 2nd layer opposite from 1st and had no issues.

Did you put the hardi in thinset over the ply yet?
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Old 07-24-2012, 07:56 PM   #5
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Ok cool! Hardibacker is cut and fitted for application over 2nd layer of plywood. I was informed by what seemed to be an under-confident individual at home depot to purchase Versabond Fortified thin-set to apply underneath Hardibacker. Does this sound right? Again he seemed about as confident as do right now as a first time tiler. I am aware that I need to tape and feel in seems as well. Again thanks for the info!
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Old 07-24-2012, 09:03 PM   #6
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Quote:
Originally Posted by GoFiNs!
Ok cool! Hardibacker is cut and fitted for application over 2nd layer of plywood. I was informed by what seemed to be an under-confident individual at home depot to purchase Versabond Fortified thin-set to apply underneath Hardibacker. Does this sound right? Again he seemed about as confident as do right now as a first time tiler. I am aware that I need to tape and feel in seems as well. Again thanks for the info!
You can use the versabond it's just a glorified modified thinset.
Mesh tape the seams on the hardi after screwed with backer screws.

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