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?
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:
Thinset (very important)
Hardi (or whatever type concrete you're using)
(in order of use, obviously, not top to bottom)
Either thickness cement board you end up using, you want to consider a "ditra"-like membrane over it.
Interesting... I have never heard of the Ditra product but it looks promising. Thanks to both of you for the information.
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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