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Old 01-05-2012, 09:19 AM   #16
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Best way to attach cement board?


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Originally Posted by 12penny View Post
Sorry, a little thick today. Dont get this part.
Read post #7.

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Old 01-05-2012, 12:53 PM   #17
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Best way to attach cement board?


It takes so little extra work to do things the best way----Dimensional wood moves to much to put a cement product directly on top ----

Plywood is really quite stable---(3/8" or thicker)

I can give a long warranty over ply and cement backer---but I could not over planks--Mike---
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Old 01-05-2012, 01:10 PM   #18
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Best way to attach cement board?


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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!
More stupid arguing!!!

Buckman,

Here's the truth of the matter:
Quote:
How about putting a thin coat of thin set down on the existing floor, laying my cement board down and screwing it down
Screwing through a cementuous-fill of any kind isn't recommended. Think about it.

You do it however you see fit.

Here's more truth:

Installing cement board directly over dimensional slat-wood is never recommended by the tile installation industry. Dimensional solid wood will move with seasonal changes (expand and contract) and changes in atmospheric (RH) conditions. That's just the way all wood is.

The movement can disrupt the cement board on top of it and quickly wreck a rigid ceramic tile installation. The recommendation of the installation neighborhood is to first install a minimum of 3/8" thick underlayment-grade plywood before installing cement board. This information comes from fifty years of industry testing and studies and experience with the issue.

Again Buckman, You decide what information from an Internet Forum you want to go with and what information you want to gamble with. It's your call - as always.
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Old 01-05-2012, 01:12 PM   #19
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Best way to attach cement board?


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Old 01-05-2012, 01:19 PM   #20
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Best way to attach cement board?


He probably ran a few extra screws into the existing floor, slapped down some underlayment, tiled it by now, enjoying the fruits of his labor.
And it will look good 5 years from now as well.

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Old 01-05-2012, 01:38 PM   #21
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Best way to attach cement board?


I'm following this thread because I also will be laying tile onto an existing 1929 plank floor with plywood patches. It is also in good shape and very level, on 16" on center floor joists. My added complication is that we are installing a Nuheat Electric radiant heat pad under the tile and our tiles are large format (12x24) so I'm concerned about cracking.

I was considering using 1/4" cement board over the existing subfloor, then thin-setting in the Nuheat pad and thinsetting the tile over that, as per the manufacturer's instructions. After reading this thread, however, I'm inclined to use the suggested 3/8" plywood instead of the cement board. I hesitate to go much thicker because I don't want to raise the floor too high.

I'm also wondering if an isolation membrane between the Nuheat and tile is advisable due to the size of the tiles?

Thanks!
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Old 01-05-2012, 01:43 PM   #22
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Best way to attach cement board?


Testarossa,

You need to start your own thread before this goes any further.

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