Fixing On Top Of Ditra Matting

[bcd-87]

You sure u weren't talking cross purposes?
Did they think u were talking about sticking it down to a substrate? That would be 2mm

I think so, maybe a small mix up

 

[bcd-87]

If the floor isn't great slc before the ditra goes down buddy.

slc.. self level compound!!!!! i'm getting the hang of this

 

[Stu Lilley]

Must be mate, but I did say I'm not talking about sticking the ditra down I'm talking about the depth of adhesive on top of the Schluter.......oh well maybe he was still was waking up and assumed that's what I was asking ☺️

The depth of adhesive on top is governed by the limitations of the adhesive as long as the square recesses are filled using your 10mm trowel the adhesive would be compressed to approx 3mm... Perfect

 

[White Room]

Schluter say max of 10mm addy on top of ditra...

 

[Stu Lilley]

Schluter say max of 10mm addy on top of ditra...

Correct.. but be aware of the limits your adhesive can work to... Don't lay an 8mm bed over a large area when you adhesive has a max of 6mm .

 

[ceekay]

Hi chaps
I know is an older topic now but I will be having tiles fitted soon over concrete and timber. The concrete is being levelled slightly then 20mm warm up insulation boards being placed over it and the timber part is 25mm wbp ply and us having warm up 10mm insulation boards fitted which will pretty much level up the two different substrates. I am then installing warm up ufh mats (3mm) and the tile 9.5-10mm it has just been suggested to me that I should be using the ditra 25 mat as well to help prevent any damage afterwards from the two different floors expanding and contracting. Is this a recommended way to go? Wouldn't want cracked tiles at the transition point one complete? Any advice please and if recommended does the warm up mat sit in top of the ditra or below?

 

[One Day]

Hi chaps
I know is an older topic now but I will be having tiles fitted soon over concrete and timber. The concrete is being levelled slightly then 20mm warm up insulation boards being placed over it and the timber part is 25mm wbp ply and us having warm up 10mm insulation boards fitted which will pretty much level up the two different substrates. I am then installing warm up ufh mats (3mm) and the tile 9.5-10mm it has just been suggested to me that I should be using the ditra 25 mat as well to help prevent any damage afterwards from the two different floors expanding and contracting. Is this a recommended way to go? Wouldn't want cracked tiles at the transition point one complete? Any advice please and if recommended does the warm up mat sit in top of the ditra or below?

Hi. Warmup mats go below the Ditra, cover with slc first though. As for the bridge between the two floors, ditra will go a very long way to absorbing the lateral movement but it's more vertical movement which will present the biggest risk. That's why Schluter will say the same as i will: you should install a fixed movement joint, such as dilex, on the joint and follow that through the ditra and to the tiles. Can look ok if planned properly.

 

[ceekay]

Hi. Warmup mats go below the Ditra, cover with slc first though. As for the bridge between the two floors, ditra will go a very long way to absorbing the lateral movement but it's more vertical movement which will present the biggest risk. That's why Schluter will say the same as i will: you should install a fixed movement joint, such as dilex, on the joint and follow that through the ditra and to the tiles. Can look ok if planned properly.

Thanks Impish
Not had any advice of my tiler in ref to the transition between the ply and the concrete. Told him I'm planning on using 20mm insulation boards on top of the levelled concrete and 10mm insulation boards on the ply but the 10mm boards would bridge and stagger across the different substrates adhered with tile adhesive and have asked him to lay these for me. Then warm up heat mats in the tile adhesive above then the tile. It was mainly my plasterer that has suggested I use the ditra 25 mat as well but ditra have said they would put slc over there mat? I only have 30mm over the ply and thus is to include the tile and insulation board. Very confused now and the work starts in a few days. Any advice from anyone greatly appreciated.

 

[jobdone]

If your tight for height. You could look at variopro ufh decouplingand heating in one. Ask Lee at tile town

 

[ceekay]

Thanks Jobdone but unfortunately already purchased 51sq mtrs of warmup mats. Got around 31mm on top of the ply but have 41mm over the concrete now it's been screeded.