Wetroom, Anhydite, Ditra, Mosaic

[kaharrison9]

Morning All.

I have 3 wetrooms on a anhydrite screed coming up and I am initially thinking of the way I plan to spec it.

The usual anhydrite preparation I'm well aware of and I was thinking of installing Ditra so it just laps onto the tray. The customer has decided he wants the 3 floors doing in 50mm mosaics.

Has anybody tiled 50mm mosaics onto Ditra? Did they fill the cavities first then lay the mosaics once the adhesive in the cavities cured or fill the cavities, 6mm notch and then lay the mosaics at the same time?

Should there be enough adhesive contact with the mosaic as with the Ditra design and using a 6mm trowel the mosaic will be in parts be pressed against the "plastic" parts of the Ditra.

Is there any other uncoupling and fully waterproofing flat system on the market?

Cheers for any thoughts.

Kevin

 

[Dave]

I would float the matting in first , then use your usual trowel for that mosaic.

 

[Dan]

Would you do it quick enough or or small enough areas to not let the adhesive cure in then cavities? I assume if you skimmed the matting one day and tiled it the next you're affecting the bond to the matting?

 

[Dave]

Would you do it quick enough or or small enough areas to not let the adhesive cure in then cavities? I assume if you skimmed the matting one day and tiled it the next you're affecting the bond to the matting?

Not at all no , quite a few skim in first ... all your doing is filling the dovetails .

 

[MTiler]

Morning All.

I have 3 wetrooms on a anhydrite screed coming up and I am initially thinking of the way I plan to spec it.

The usual anhydrite preparation I'm well aware of and I was thinking of installing Ditra so it just laps onto the tray. The customer has decided he wants the 3 floors doing in 50mm mosaics.

Has anybody tiled 50mm mosaics onto Ditra? Did they fill the cavities first then lay the mosaics once the adhesive in the cavities cured or fill the cavities, 6mm notch and then lay the mosaics at the same time?

Should there be enough adhesive contact with the mosaic as with the Ditra design and using a 6mm trowel the mosaic will be in parts be pressed against the "plastic" parts of the Ditra.

Is there any other uncoupling and fully waterproofing flat system on the market?

Cheers for any thoughts.

Kevin

50mm mosaics is the smallest size you can lay on Ditra. Surely filling in Ditra and letting it cure before fixing tiles is defeating the object of using Ditra in the first place?

 

[Dan]

50mm mosaics is the smallest size you can lay on Ditra. Surely filling in Ditra and letting it cure before fixing tiles is defeating the object of using Ditra in the first place?

That's what I thought.

Isn't that then the same as fixing to a screed in some sense?

Or maybe half way between not using ditra and using it. Or something.

I thought the full benefit of the dovetails was to adhere the tile to them. But skimming them first seems to be taking away that security. No?

 

[Tile seller]

I would fill in the cavities first, let it dry then, proceed with the mosaics.
Adhesive doesn't really stick to the matting so they put the cavities in as a way of almost mechanically fixing the tile. But adhesive will fix fine to adhesive when fully dry so I can't see the problem here. The uncoupling system still works as the movement textile underneath is still uncoupling the layers.
Otherwise, perhaps use ditrabase?No cavities to fill in then.

 

[Dan]

Yeah I understand that bit. I just thought the fixing in one go was the way to use ditra to be honest but perhaps not then.

The mechanical fixing with dural is the webbing isn't it?
Perhaps wise with mosaics?

 

[Dave]

Kev, it's very popular in the U.S. to float in first , I've done in on wet room floors only now and then but these guys do it a lot >>>
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[Dan]

If you do float first, do you find that you need to go 45 degree one way, then back again the opposite way you just came, to really push the adhesive in the corners of the dovetails? Or if the mix is right just it just settle in the corners easily enough anyway?