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Old 08-03-2013, 08:15 AM   #16
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How thick subfloor needed under tile?


Okay, thanks! So just so I'm clear. After I finish putting down this layer of 1/4" plywood to get my floor flush with the threshold, I can then use Durrock/Wonder board/Orange stuff to set my tiles on.

OR are you saying that after I put down this 1/4" plywood to get my floor flush with the threshold I still need to put 3/8" or 1/2" inch plywood on top and THEN the Durrock/Wonder board/Orange stuff?

Sorry, I just want to make sure I get this right. =)
Karen

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Old 08-03-2013, 08:37 AM   #17
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How thick subfloor needed under tile?


Okay, thanks!

So just so I'm clear..... After I finish putting down this first layer of 1/4" plywood to get my floor flush with the threshold, can I then use the Durrock/Wonder board/Orange stuff to set my tiles on?

OR are you saying that after I put down this 1/4" plywood to get my floor flush with the threshold, I still need to put 3/8" or 1/2" inch plywood on top and THEN the Durrock/Wonder board/Orange stuff?

Sorry, I just want to make sure I get this right. =)
Karen
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Old 08-03-2013, 08:48 AM   #18
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How thick subfloor needed under tile?


No you are not clear---it will be best if you get rid of the 1/4" plywood---it has no place in a tiled room---

instead, use 3/8" or 1/2" BC exterior glue plywood---then the tile backer.
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Old 08-03-2013, 10:08 PM   #19
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How thick subfloor needed under tile?


Quote:
Originally Posted by KarenSB
Okay, thanks!

So just so I'm clear..... After I finish putting down this first layer of 1/4" plywood to get my floor flush with the threshold, can I then use the Durrock/Wonder board/Orange stuff to set my tiles on?

OR are you saying that after I put down this 1/4" plywood to get my floor flush with the threshold, I still need to put 3/8" or 1/2" inch plywood on top and THEN the Durrock/Wonder board/Orange stuff?

Sorry, I just want to make sure I get this right. =)
Karen
Your 2 options are what Mike said to do. loose the 1/4" plywood and i mean loose it like its carpeting! and put down in same direction as 1st layer of your already 3/4" plywood the 1/2" OR 3/8" BC sanded or exposure ply then 1/4" cement board. Or a schulter ditra membrane BUT NOT BOTH, one or the other.

Follow it like this:
Joists
3/4" ply
1/2" or 3/8" sanded or exposure "glue it down"
Thinset with notch trowel
1/4" cement board NOT plywood
Cement board screws
Mesh tape seams with thinset
Thinset with notch trowel
Lay and place Tile
Grout
wipe grout clean
Big smile = good job! Nice floor! Post pics

Last edited by JetSwet; 08-03-2013 at 10:10 PM.
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Old 08-03-2013, 10:34 PM   #20
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How thick subfloor needed under tile?


Jetswet--I could be wrong but I'm pretty sure there's no need to glue the second sheet of plywood.
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Old 08-03-2013, 11:10 PM   #21
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How thick subfloor needed under tile?


Quote:
Originally Posted by rustyjames
Jetswet--I could be wrong but I'm pretty sure there's no need to glue the second sheet of plywood.
If its a exposure class plywood it's recommended that it gets glued down especially a thiner layer like 3/8" if that's the choice to use. Some people glue regardless, I've seen guys use CDX sanded and glue it down. What your doing by gluing is making almost one hole piece of plywood by gluing it together, reduce weekness in deflection.
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Old 08-04-2013, 12:22 AM   #22
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How thick subfloor needed under tile?


I used a rototillar (not in the bathroom) today for the first time and it flung me around like a rag doll. So I'm pooped and sore and should be in bed. But I just thought I'd add a note....

Initially I bought the 1/4" plywood because I couldn't remember correctly whether the flooring guy I had talked to said to add 1/4" or 1/2" inch to my 3/4" plywood. But the guy at the lumber store said 1 full inch under tile was sufficient. So I went with the 1/4".

Then I read the forum entry that said DO NOT USE 1/4" PLYWOOD. But here's the thing....

I had by then realized that I need the 1/4" plywood on top of the 3/4" plywood to make the floor flush with the original floorboard under the threshold (see previous entry re: hiccup).

So I have laid the 1/4" plywood and I'm really quite proud of myself. The holes for the water lines, drains, etc. couldn't have been more perfect. And it is a really nice tight fit and butts up against the floor board so snuggly. Tomorrow I'm going to nail the crap out of it ~ every four inches but avoiding the joists (after I wrestle with the rototillar again, as I only have it rented for the weekend). Then I'm going to sand the original floor board a smidge ~ because it turns out that an inch back in the early 1900's is thicker than today's 3/4" + 1/4" sandwiched together.

Then I'm going to add another layer of 3/8" inch plywood ontop of everything. Nail the crap out of it. Then I'm planning on applying mortar (which I think you are calling "thinset") and place the tiles.

I know that many of you have recommended using a membrane or concrete board but a) I can't afford it, b) though the generous shared wisdom and experience on these forums are, to me, invaluable, I get confused with the myriad of differing opinions offered.

When I didn't hear back initially from one forum I posted the same question on another DIY forum. Then I started getting answers from both forums. And I struggle with the contradictions among the responses.

But I am learning a lot and it gives me so much more confidence to move forward. I am hoping (because I paid $4.25 sq/ft for the marble tile) that the 1 3/8" foundation underneath the tile will be sufficient to keep the floor from moving and the grout from cracking.

Any further suggestions you have about making the foundation as sure as possible (given the understanding that I am not using the membrane or concrete board) are welcome!!! (i.e. to glue or adhese the 3/8" to the 1/4" before I nail it down, etc.)

I don't know yet whether I should put the 3/8" plywood in the same direction as the 1/4" plywood or across it (also received opposing opinions about that). But I will send pics of the final product and hopefully you will all be pleased for me and feel acknowledged for the wonderful co-creative role that you play to help all of us neophytes do what we want to do!

Blessings to you all!
Night, night...
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Old 08-04-2013, 06:34 AM   #23
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How thick subfloor needed under tile?


The reason you should use a tile backer is this----wood expands and contracts at a different rate than marble---so there is a good chance the marble will come loose if it is stuck to plywood---

The Durrock or Ditra is an ideal surface for the stone---

If you wish to take a chance of the bond between the wood and stone failing---that would be your choice---Lots of floors were set over plywood many years back,before the backers were invented.

I sure would not do it---I have to pay for any failures, so I try to do the best installation possible.

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