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Old 04-29-2018, 04:06 PM   #1
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new tile subfloor ADVICE NEEDED


Hello friends,
Existing kitchen floor is 3/4" pine boards (7 1/2 wide, 1/4-1/2" gaps) with 5/8" MDF and Linoleum. It needs to meet the adjacent room oak flooring which sits 3/4" off the pine boards.
So the new tile floor has to total 3/4". If I use 5mm tile (1/4") should I keep the pine boards and add 1/4" plywood + 1/4" backer board? Something different? What should I do?

Thanks! TIM
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Old 04-29-2018, 04:39 PM   #2
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Re: new tile subfloor ADVICE NEEDED


Unfortunately, I do not believe your "pine boards" are an acceptable subfloor for tile. You're going to want 3/4" plywood/OSB. Then you use the backer of your choice (1/4 or 1/2) to flush with your hardwood.
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Old 04-29-2018, 06:39 PM   #3
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Re: new tile subfloor ADVICE NEEDED


MDF as an underlayment for tile, not going to happen?
Sure it's not particle board which would also be unexcepticle as as an underlayment for tile.
Tile is a one shot deal, not what they show on the DIY shows.
What size are your floor joist, what's the free spans?
The last thing I worry about when laying tile is the height difference.
Transition strips can deal with that.
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Old 04-29-2018, 07:36 PM   #4
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Floor joists are 2x8, 16 on center.
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Old 04-30-2018, 08:02 AM   #5
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Re: new tile subfloor ADVICE NEEDED


What's the unsupported span?
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Old 05-02-2018, 07:00 PM   #6
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Re: new tile subfloor ADVICE NEEDED


unsupported span is 11' from a steel I beam to the outside foundation wall.
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