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Old 04-11-2010, 05:45 PM   #1
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subfloor preperation for bathroom tile


I'm installing 12x12 tile on my bathroom floor. I removed the old vinyl and the 1/2in. partical board. The pb was glued in some random spots and some of the 3/4in ply came up with it. The floor joist are 10in doug/fir oin 16in centers. The bathroom is 6ft wide and 14ft long, with the joistsrunning lengthwise. MY plan was to use thin set and 1/4in hardi board before installing the tile. The 3/4in ply subflooring seems ok, but I have concerns about the parts that pulled up. I thought about putting 1/2 ply down first before the 1/4in hardi board or just use the 1/2in hardi board before installing the tile floor. Not sure which is the best way to go. Needing advise in Alaska...

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Old 04-11-2010, 06:14 PM   #2
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subfloor preperation for bathroom tile


add at least a layer of 1/2" underlay first then tile backer

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Old 04-11-2010, 06:16 PM   #3
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subfloor preperation for bathroom tile


Hi JA,

No way to tell you if the subfloor was damaged too much, you're the judge. Using 1/2" instead of 1/4" Hardie will only get you a little closer to the ceiling, it will not make your floor stronger. Best bet is to add an underlayment grade plywood, 3/8" min, 1/2" preferred, then the backer board and tiles. Or a membrane such as Ditra instead of Hardie.

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Old 04-11-2010, 06:20 PM   #4
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subfloor preperation for bathroom tile


does your floor feel bouncy like the bath is in the middle of the floor joist span?
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Old 04-11-2010, 06:41 PM   #5
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subfloor preperation for bathroom tile


The floor seems good and rigid. The tub is at the end of the room running width wise. So I am really not worried about that. The sink and toilet are on the left wall, so the main traffic and weight are in the center pathway to the tub, which has 3 joists on 16in centers. Thanks for your reply...
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Old 04-11-2010, 06:58 PM   #6
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subfloor preperation for bathroom tile


Thanks you guys for the input... My gut feeling is to do just what you said, because I don't want any problems/cracking,etc. Anyway thanks a million!

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