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Old 12-04-2013, 09:03 PM   #21
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Re: Flooring Leveler


A slc over a membrane ( ditra)is a bad idea!
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Old 12-05-2013, 05:52 PM   #22
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Re: Flooring Leveler


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A slc over a membrane ( ditra)is a bad idea!
Why?
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Old 12-07-2013, 03:26 PM   #23
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Re: Flooring Leveler


Because Ditra isn't Ditra anymore when it's buried under a pile of cement. It might as well not even be there. Hell, throw some Mont Blanc pens down there and cover them up while you're at it. hehe
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Old 12-07-2013, 03:52 PM   #24
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Re: Flooring Leveler


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Because Ditra isn't Ditra anymore when it's buried under a pile of cement. It might as well not even be there. Hell, throw some Mont Blanc pens down there and cover them up while you're at it. hehe
Isn't it still a detached/floating membrane.
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Old 12-07-2013, 04:33 PM   #25
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Re: Flooring Leveler


Does anybody ever think to call the tech number on the product? I rather do that than listen to so called " experts"
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Old 12-07-2013, 08:59 PM   #26
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Re: Flooring Leveler


Isn't it still a detached/floating membrane.

Holie effing S!!

Detached from what? The sedimentary layer it's become?

Look, kids. Level under. Uncouple on top.

Q&A later.
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Old 12-07-2013, 09:03 PM   #27
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Re: Flooring Leveler


The people at the "tech number" will tell you what I just did, by the way. This goes for Redguard and everything else as well. If you bury a surface applied solution, you bury the solution.

Carry on.
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Old 12-08-2013, 12:29 PM   #28
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Re: Flooring Leveler


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Because Ditra isn't Ditra anymore when it's buried under a pile of cement. It might as well not even be there. Hell, throw some Mont Blanc pens down there and cover them up while you're at it. hehe
It's not there to work as it an uncoupling membrane, it is there to relieve the vapor pressure. Above or below the SLC the vapor is still going to travel through the channels in the product to the outer edges. The movement of the vapor is why Schulter allows and warranties tile install with Ditra once the concrete is walkable.

This install is tile over concrete, you can use Ditra, but it is not as critical as it is when used tile over wood.

Yes, it is still detached, the fleece has not gone anywhere.

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Old 12-08-2013, 02:52 PM   #29
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Re: Flooring Leveler


Yes, it is still detached, the fleece has not gone anywhere.

You don't understand how Ditra works. The fleece doesn't uncouple anything. The fleece is there to act as a bonding agent. (thinset won't stick to plastic for long) The uncoupling happens on the other side. The miracle of Ditra is in the little trapezoids that the thinset sets up in. It's like a monkey trap. You wind up with a genuine mechanical bond. It's really amazing to think about what a genius that guy was. I actually have an old ring set with the first version of Ditra with the channels in it instead of the squares. Same brilliant concept, but the next generation is much better.

but it is not as critical as it is when used tile over wood.

Huh? Ditra is also a crack suppression membrane. You should go to a Schluter class. They're free and very enjoyable.

Last edited by ccoffer; 12-08-2013 at 02:55 PM.
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Old 12-08-2013, 07:16 PM   #30
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Re: Flooring Leveler


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Yes, it is still detached, the fleece has not gone anywhere.

You don't understand how Ditra works. The fleece doesn't uncouple anything. The fleece is there to act as a bonding agent. (thinset won't stick to plastic for long) The uncoupling happens on the other side. The miracle of Ditra is in the little trapezoids that the thinset sets up in. It's like a monkey trap. You wind up with a genuine mechanical bond. It's really amazing to think about what a genius that guy was. I actually have an old ring set with the first version of Ditra with the channels in it instead of the squares. Same brilliant concept, but the next generation is much better.

but it is not as critical as it is when used tile over wood.

Huh? Ditra is also a crack suppression membrane. You should go to a Schluter class. They're free and very enjoyable.
The thin set will not stick to the plastic at all. Part of the design. There is a chemical bond to the tile, a mechanical bond to the Ditra via the dovetails.

The fleece is most defiantly a slip sheet.

Until 2012 Ditra was not listed by Schulter as a crack isolation product. It is currently the only isolation product that does not require a soft joint along the crack. Go look at the 2011 install manual. It cannot be used to render expansion joints non functioning. You have to split it at the expansion joint. it is not TCNA/ASTM recognized, but it's now warrantied by Schulter.

In this thread the goal was prevent the vapor pressure from affecting the SLC bond, Ditra is the perfect product for this. Ditra bonded to the slab, SLC mechanically bonded to the Ditra, vapor escapes through the grid.

Go take the class, maybe you'll learn something this time.

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Old 12-08-2013, 08:33 PM   #31
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Re: Flooring Leveler


Pride. Uggh.

Why do the folks at Schluter disagree with you, Einstein?

Most defiantly? WTF?

I really get tired of trying to share the obvious with those determined to covet their own beloved ignorance.

Last edited by Warren; 12-08-2013 at 09:11 PM. Reason: abusive tone
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Old 12-08-2013, 08:46 PM   #32
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Re: Flooring Leveler


Coffer, no need for a moisture barrier when using the slc below grade?
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Old 12-08-2013, 08:47 PM   #33
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Re: Flooring Leveler


The fleece is most defiantly a slip sheet.

According to whom? Buried under leveling compounds?

Here's a crazy idea: Read the instructions.
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Old 12-08-2013, 08:51 PM   #34
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Re: Flooring Leveler


no need for a moisture barrier when using the slc below grade?

For the sake of the cement? Hell no.

Dangit!! THINK, PEOPLE!!!

Floor patch isn't damaged by moisture. Moisture sensitive flooring is. Surface applied remedies only work if they are applied to the surface.

I want to cry right now.
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Old 12-08-2013, 09:27 PM   #35
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Re: Flooring Leveler


Don't cry. I'm just trying to learn something. I don't do much below grade work so bear with me.
My thought was that you would kill two birds with one stone by blocking moisture transfer with the ditra.
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Old 12-08-2013, 09:50 PM   #36
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Re: Flooring Leveler


You just reminded me of an old commercial.

"What is hamburger? Chopped ham? NO! It's chopped steak and whats better on steak than A-1?"

What is SLC? Is it not concrete? Is it somehow immune to what is going on in the rest of the concrete in the immediate vicinity?

Let us cover the concrete with something. Let us not dig a grave and brag about what a great grave we dug.

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Last edited by ccoffer; 12-08-2013 at 09:54 PM. Reason: quotes
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