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Old 01-13-2018, 10:30 AM   #1
vortech91
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quick subfloor question

I have 3/4 x 6 planking on a 45degree angle to joist. Deflection calculation is fine. Ive read that I should put 1/2 plywood down then uncoupling (either cement board/ liquid underlayment, or ditra mat. Problem is the 160 square feet kitchen that I want to tile opens up to hardwood flooring layed on the same 3/4 x 6 planking and I would like to keep the transition to the hardwood even. Is there anyway that I can get proper underlayment and uncoupling for tile in 1/2 inch total. I was thinking 1/4 inch "plyfloor" underlayment plywood from menards. then 1/4 inch backerboard? That would allow me to be flush with the hardwood floors. Thoughts?? thanks
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Old 01-13-2018, 03:23 PM   #2
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The thinnest ply you could use would be 3/8" but finding a quality exposure grade 1 ply in 3/8" can be difficult at times. I wouldn't go less than 1/2" personally. 1/4" won't do you much good in this case.
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Old 01-13-2018, 11:41 PM   #3
Obo2
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Ditra is only 1/8" installed. Backer board would be thicker.

15/32 ply and ditra gets you just barely over a half inch.
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Old 01-14-2018, 05:48 AM   #4
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First I would want to know the spacing on the joists before recommending a plywood thickness. But I believe the thinnest you can use over plank flooring is 1/2".
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