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Old 09-13-2007, 09:13 PM   #1
Kyle Emerick
 
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1/4" or 1/2" cement board?


For my kitchen remodel, in preperation for laying 20" ceramic tiles; I fixed my squeeky floor planks which lay on joints (16" spread) and then sheeted T&G 3/4" plywood. I used 3" screws and Liquid Nails subfloor glue.

I have a couple very minor soft spots that my wife does not even notice. I am however concerned and contemplating 1/4" or 1/2" Hardibacker sheets. I know Hardibacker is not structural, but I am thinking 1/2" would be the better choice.

Should I use 1/2"?

Should I use roofing paper on the subfloor before I lay the first layer of thin set for the Hardibacker... or is that too anal?

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Old 09-13-2007, 11:02 PM   #2
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1/4" or 1/2" cement board?


Like you said, it really makes no difference. Use whichever one suits your needs (the adjacent floor heights, etc). No need for tar paper, just:

Plywood

Thinset (very important)

Hardi (or whatever type concrete you're using)

Thinset

Tile

(in order of use, obviously, not top to bottom)

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Old 09-14-2007, 05:29 AM   #3
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1/4" or 1/2" cement board?


Either thickness cement board you end up using, you want to consider a "ditra"-like membrane over it.

Links:

http://www.johnbridge.com/ceramic_tile_floors_ditra.htm

http://www.schluter.com/6_1_ditra.aspx
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Old 09-14-2007, 06:49 AM   #4
Kyle Emerick
 
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1/4" or 1/2" cement board?


Interesting... I have never heard of the Ditra product but it looks promising. Thanks to both of you for the information.
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Old 09-14-2007, 11:42 AM   #5
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1/4" or 1/2" cement board?


If you go with a product like Ditra, it's instead of any CBU. No Hardi. Ditra is not only much easier to install, but is a better surface to install tiles to. It does cost more however.

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