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Old 01-04-2012, 09:12 PM   #1
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Best way to attach cement board?


I've got a bathroom (4x12) with original 3/4 (t&g) planking covering about half the floor and new 3/4 plywood used as floor patch. Where the original planking and new plywood meet there is about a 1/8" lip in some spots.

Can I put cement board over the existing planking and new plywood?

I've a friend who has done many tile floors and wants to staple down wire mesh and use thinset instead of using cement board. Thoughts?

I appreciate your feedback.

Buckman


Last edited by buckman; 01-04-2012 at 09:36 PM.
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Old 01-04-2012, 09:22 PM   #2
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Best way to attach cement board?


Try to beat the planking down to get it as flush as possible with the plywood and be careful where the cement board seams are, not too close to the transitions.

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Old 01-04-2012, 09:35 PM   #3
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Best way to attach cement board?


Wire mesh for the most part has not been done for many years.
Tile is a one shot deal.
If you want to do this right and not end up with a crack in the middle of the floor your going to have to have the floor act like one piece and be 100% soild under foot.
That would mean removing all of that old wood (use a Toe Kick saw and an ossilating saw) Unless that plywood is T & G 3/4" subfloor rated it's got to go to. Replace it with T&G 3/4" Advantec with constrution adhesive on top of the floor joist and Use ceramic coated screws every 4". Go over that with 3/8 plywood making sure not to have the seams line up with the seams below. Install screws every 4" on the edges and every 6 to 8" in the field.
Now your going to spead thin set and set 1/4" tile board and use tile board screws to attach it. There a pattern on the board where the screws go. Now your ready for the tile.
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Old 01-04-2012, 10:32 PM   #4
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Best way to attach cement board?


Hi guys,

Sorry, but I do not agree with either reply totally.

Titanoman apparently forgot that you should not install any backer board direct to planks.

Your friend is suggesting what is known as a "Jersey Mud Job", which although can work much of the time, has failed every test it's been subjected to. It's also know as a "scratch-coat", total cheapo way to go.

It sounds as Joe thinks you're talking about a real mud job, I think not. I also think what he's suggesting may be more than needed unless the old floors are in real bad shape. All you should need to do is install 3/8" or thicker underlayment plywood and then the backer or membrane, then tiles.

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Old 01-04-2012, 10:36 PM   #5
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Best way to attach cement board?


Quote:
Originally Posted by JazMan
Hi guys,

Sorry, but I do not agree with either reply totally.

Titanoman apparently forgot that you should not install any backer board direct to planks.

Your friend is suggesting what is known as a "Jersey Mud Job", which although can work much of the time, has failed every test it's been subjected to. It's also know as a "scratch-coat", total cheapo way to go.

It sounds as Joe thinks you're talking about a real mud job, I think not. I also think what he's suggesting may be more than needed unless the old floors are in real bad shape. All you should need to do is install 3/8" or thicker underlayment plywood and then the backer or membrane, then tiles.

Jaz
Sure you can if it's in good shape.

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Old 01-04-2012, 10:44 PM   #6
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Best way to attach cement board?


I'm just used to working on old houses where nothing flat, or level. Once he said there was slats I figure the floor joist will be to narrow and to long a span. A givin in any old house.
Better to be safe then sorry. As I said it's a one shot deal.
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Old 01-05-2012, 06:41 AM   #7
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Best way to attach cement board?


Thanks for the replies guys. The old planking is even and the joist span is 16" on center or less. The new plywood patches are T&G subfloor approved plywood.
How about putting a thin coat of thin set down on the existing floor, laying my cement board down and screwing it down and then tile?
I'm trying not to raise my floor too much from the rest other rooms.

Also it's a small, chopped-up bathroom with the largest walking area at 36" wide.
Thanks again!
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Old 01-05-2012, 06:49 AM   #8
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Don't lay the backer onto the planks---they move a lot in a year--add 3/8" ply over the whole floor--

Use 1/4" backer board set into a bed of fresh thinset and nail or screw that down.
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Old 01-05-2012, 08:42 AM   #9
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Best way to attach cement board?


Quote:
titanoman: "Sure you can if it's in good shape".
That is very bad advice. Please do not attempt that.
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Old 01-05-2012, 08:55 AM   #10
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Best way to attach cement board?


Quote:
Originally Posted by oh'mike
Don't lay the backer onto the planks---they move a lot in a year--add 3/8" ply over the whole floor--

Use 1/4" backer board set into a bed of fresh thinset and nail or screw that down.
I think 1, the planks are done moving, and 2, the op isn't out to do remodeling, he just wants to lay a very small amount of tile.

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Old 01-05-2012, 09:01 AM   #11
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Best way to attach cement board?


...and 3, when the seasons change and the floor boards begin to swell from increased humidity, he'll wish he'd spent the money on a sheet of plywood.

Dont forget, cement board is not structural.

Last edited by 12penny; 01-05-2012 at 09:03 AM.
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Old 01-05-2012, 09:02 AM   #12
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Best way to attach cement board?


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...and 3, when the seasons change and the floor boards begin to swell from increased humidity, he'll wish he'd spent the money on a sheet of plywood.
And this will move the cement board? I don't think that's possible.

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Old 01-05-2012, 09:07 AM   #13
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Best way to attach cement board?


You do it your way, I'll do it mine. I refuse to lose sleep over a $25 sheet of plywood.

To the OP, spend the money to do it right or do it twice.
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Old 01-05-2012, 09:13 AM   #14
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Best way to attach cement board?


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Originally Posted by 12penny View Post
You do it your way, I'll do it mine. I refuse to lose sleep over a $25 sheet of plywood.

To the OP, spend the money to do it right or do it twice.
I don't think he's concerned about the money so much as building an unnecessary trip into his bathroom.
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Old 01-05-2012, 09:18 AM   #15
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Best way to attach cement board?


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I don't think he's concerned about the money so much as building an unnecessary trip into his bathroom.
Sorry, a little thick today. Dont get this part.

Nevermind, I found where he said it.

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