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Old 06-18-2012, 01:11 PM   #1
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What to use for subfloor thickness wise


I am changing out vinyle floor to tile, I want to be able to line up with wood floor in next room.

Now the floor in 3/4in particle board I am sure on this being particle so I am pulling this up.

the wood floor that is on the side is 1/2 thick so I have a 1 and 1/4 to work with tile is 5/16 thick


So what I am asking is what size concrete board and what size plywood
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Old 06-18-2012, 06:47 PM   #2
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What to use for subfloor thickness wise


3/8" underpayment or cdx, then 1/2" cement board, 7/16" is your tile with thin set. Keep in mind the plywood will actually be 9/32"
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Old 06-18-2012, 09:09 PM   #3
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What to use for subfloor thickness wise


You want at least 3/4" ply A/C or B/C sanded from joists up then 1/4" backer board not 1/2" cuz hight and 1/2" is mostly for walls not floors.
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Old 06-18-2012, 10:39 PM   #4
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What to use for subfloor thickness wise


Joe,

You didn't make it clear if the 3/4" particle board is "the" subfloor or it's over the subfloor.

Are you sure the hardwood in the next room is only 1/2" thick?

Jaz
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Old 06-19-2012, 08:13 AM   #5
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What to use for subfloor thickness wise


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Joe,

You didn't make it clear if the 3/4" particle board is "the" subfloor or it's over the subfloor.

Are you sure the hardwood in the next room is only 1/2" thick?

Jaz
The hardwood is 12mm close to 1/2 thick for sure becaouse I put it in


Right now the floor is 2x12 joist
on top of the joist are 2x10 (I think) run the opposite direction of the joist
on top of that is the 3/4 partical (not OSB)

MY plan is to take the particle sheets out
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Old 06-19-2012, 01:56 PM   #6
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What to use for subfloor thickness wise


Joe,

Your answer; "2x10 (I think)" will not work. We need to know what you've got, not guesses. Double check that and also the on-center spacing of the joists and the unsupported span. It would also be helpful if you said where you are since building specs vary from region. From what you've written so far it sounds to me like you're on the left coast.

I would also need to know the condition of your subfloor. If they're as wide as you now think, you will need 3/4" ply since the likelyhood of them being warped or cupped is high.

It might be possible to match both floors, but that being the main goal is not a good plan.

Jaz
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Old 06-20-2012, 09:10 AM   #7
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What to use for subfloor thickness wise


I am in the midwest Evansville IN

They are 2x10s over top of the 2x12 floor joist

The joist are 16in apart
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Old 06-20-2012, 01:31 PM   #8
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What to use for subfloor thickness wise


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They are 2x10s over top of the 2x12 floor joist
That is very unusual, the 2x10 part. Plank subfloor is almost always 1x with the exception of many structures on the left coast where the joists are 4 ft. or so on center.

OK, so depending on the condition of the subfloor you may need 3/4" ply over the 2x10 plank subfloor. Then pick your method of installation.

Jaz
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Old 06-22-2012, 09:05 PM   #9
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What to use for subfloor thickness wise


A typical subfloor is 3/4 in. whether modern sheets or older planks(which are usually run 45 degrees to the joists for structural integrity) I always make sure to secure the subfloor down well with screws then install a 1/4 hardiback on the floor making sure to utilize the screws that are meant for hardi installation. It is very important to ensure your subfloor is in good shape. This extra time spent is rewarded by years of trouble free use of your new tile instaalation.. I hop I have been of some assistance

Last edited by oh'mike; 06-22-2012 at 09:07 PM. Reason: Removed link--read posting rules
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Old 06-22-2012, 10:57 PM   #10
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What to use for subfloor thickness wise


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A typical subfloor is 3/4 in. whether modern sheets or older planks(which are usually run 45 degrees to the joists for structural integrity) I always make sure to secure the subfloor down well with screws then install a 1/4 hardiback on the floor making sure to utilize the screws that are meant for hardi installation. It is very important to ensure your subfloor is in good shape. This extra time spent is rewarded by years of trouble free use of your new tile instaalation.. I hop I have been of some assistance
Does this method also apply with a plank subfloor as you mentioned and is the case in this thread? How about thin set for the Hardie?

Jaz
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