DITRA versus 1/4" concrete backer board

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Old 12-01-13, 08:56 AM
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DITRA versus 1/4" concrete backer board

By the time you put down the thin-set and roll out the DITRA on top of it, will it be about the same thickness as just using 1/4" concrete backer board?

This will be going down over top of 1/2" Sheeting under 3/4" in particleboard underlayment.
 
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Old 12-01-13, 10:33 AM
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Hope you meant OSB and not "particleboard". Ditra and cbu serve the same purpose. Ditra doesn't save a ton of height, but some. CBU is cheaper.
 
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Old 12-01-13, 10:48 AM
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Nope. It's particleboard. I'm not sure why they used it either, but it runs throughout the entire house.
 
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Old 12-01-13, 11:18 AM
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Unfortunately, the particle board needs to come up, it is not structurally stable enough for use under tile. Any sign of moisture and it swells and disintegrates. Will totally ruin all your hard work and effort to put down a new floor. I have torn up many a floor worth of particleboard and still find it hard to believe that you can still buy this garbage at your local box store.
 
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Old 12-01-13, 11:35 AM
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I kinda wondered about that. Why did they use it in the first place?? This is an older home.
 
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Old 12-01-13, 01:34 PM
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Why did they use it in the first place??
It was cheap, made from waste products, and initially was a very flat, stable substrate used almost universally. Then came the moisture and water. Uh-oh, we didn't plan on that
 
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Old 12-03-13, 09:42 PM
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Originally Posted by greg
By the time you put down the thin-set and roll out the DITRA on top of it, will it be about the same thickness as just using 1/4" concrete backer board?
No it won't. Ditra is 1/8" thick and the thin set adds nothing. 1/4" CBU will be at least 5/16" installed.

Sorry about the particle board. It really needs to be taken to the curb.

Originally Posted by greg
This will be going down over top of 1/2" Sheeting under 3/4" in particleboard underlayment
How is that possible? Tell us how the framing and subfloor is built and with what.

Jaz
 
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Old 12-13-13, 02:41 PM
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Sorry Jazman.. missed your post.


When I ripped up the old floor, I found 1/2" OSB covered by 3/4" particle board underlayment. The tile was installed over top of that.

I patched up the 1/2" OSB.. replacing the rotted section. Then removed all particleboard and put down 5/8" OSB in its place.

1/4" backerboard in going down on top of this.

Finally, 12x24 porcelain tile will go in.
 
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Old 12-13-13, 06:05 PM
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Greg,

Sorry Jazman.. missed your post.
Oh ok, good. At first I thought you were upset cuz my Michigan State Spartans beat your Buckeyes last week and spoiled their perfect season.

Particle board was widely used in the '70's and '80's by cheap-ass builders to save a few hundred per house. They thought they were geniuses. It's terrible stuff. Now we have OSB. Some of the OSB is pretty good. This is mostly the OSB designed as a subfloor, it's t&g 3/4" thick and thicker. Problem is that people are tempted to buy the square edge sheets they see at the big box stores, less $$$. If you've noticed these are very porous and are liable to be unstable too.

So, let's review. Your subfloor is 1/2" OSB? How did that happen? Please tell us it's not so. You removed the PT and installed 5/8" OSB as the underlayment . How about the joists? Are they stiff enough for tile? Anyone look at a span chart?

Any plans for the setting materials yet?

Jaz
 
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