sub floor for new Tile in kitchen

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Old 09-11-07, 08:56 AM
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Location: Morristown, NJ
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sub floor for new Tile in kitchen

In the process of tiling our kitchen floor and I have ripped out the old hardwood and linoleum down to the original 3/4 in plank sub floor. I have been told I need 2 layers of 3/4 in sub floor for a secure base for the 12x12 tiles. So the original sub floor is one 3/4 in layer (I had already purchased 1/4 in cement backer board which I would like to not have to take back.) So my question is, would I be able to get away with 1/2 in plywood 1st then the 1/4 in backer board? or am I better off getting 3/4 in plywood and returning the cement backer board? Also I have heard that particle board would be cheaper and more rigid but that it should not be used where there's the possibility of moisture... does a kitchen application mean particle board is out of the question?
 
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Old 09-11-07, 11:57 AM
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Maybe one of the tile guys can give a better answer, but I've done tile floors in a couple of kitchens and several bathrooms and the floor has always been 1/2" subfloor with 3/4" underlayment over which I've put 1/4" backer board. I've never had a problem with this.

However, I've always used plywood and not plank. I may be wrong, but I think plank (is it T&G) may have enough movement to give you problems down the line.
 
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