I have a 5/8" T&G plywood Sub floor in my kitchen. I want to put 18" porcelain tile on it. I re-screwed the 5/8" ply but i was told i need 1 1/8" total sub floor before i install the tile and cement board. I plan on putting down 1/2" ply over the 5/8" ply for structure.
QUESTIONS:
1. should i butt 1/2"x4x8 sheets of ply tight end to end and side to side?
2. Should i glue them and nail only through the 1/2" ply and 5/8" ply and the joist? What pattern?
3. Can i put 1/2" cement board on the 5/8" ply instead of 1/2"ply or should i put 1/4" fiberboard on top of the 1/2" ply?
I thank you for any suggestions.
5/8" is considered good enough in the industry. Scares the heck otta me though. If it was 3/4" I'd say good. So go ahead and add an underlayment. The more the better.
i was told i need 1 1/8" total sub floor before i install the tile and cement board
1. No, leave 1/8" gap. Check with the thin set manufacturer cuz some want the gap filled when installing the concrete backer, some may not.
2. Re-nail or screw the 5/8" subfloor first. Fasten the underlayment to the subfloor only, not the joists. Use 1 1/2" screws or ring shank nails. No cheapo drywall screws. Underlayment should NOT be glued to the subfloor. Pattern? for 1/2" 4-5" on perimeter, 5-6" in field. Of course the sheets go across the joists, same as the subfloor, but offset both ways.
3. I recommend adding the ply, then 1/4" tile backer or if you wanna go premium go with Ditra.
Jaz
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