Ditra on top of Devi??

[astechsolutions]

Hi, new here and some way through my new extension. Has come to tiling and UFH. Q: I have. New extension has water UFH, screed top and I plan to install Ditra mat prior to tiling. We have created open plan living by knocking the old kitchen and dining room into one and also open planned with new extension. Old floor however is Weyroc (chipboard flooring) and I want to install electric devi UFH in here. for consistency can I install Ditra on top of electric UFH?

 

[White Room]

Could the chipboard be changed for ply, was it a stud wall removed or a brickwall between the rooms

 

[astechsolutions]

Basically I have 1 large room with two floor constructions. Due to this I have already successfully installed water UFHwith screed flooring.I want UFH also in other area with floor construction that necessitates electric UFH. This in itself is not the issue. AsI am tiling throughout I plan to use ditra to protect the tiles from lateral movement. I am unsure of the thermal properties of the ditra if it gous on top of the electric (devi) mat. Concern is overheating and electrical failure. Does anyone have any experience of this?

 

[White Room]

I use a self leveling on top of the ufh, any wires can be held down with hot glue gun to stop them rising when the slc is applied, then ditra, then tiles.

Between the the different surfaces, where the walls have been removed use controlled joints to allow movement between to allow for expansion for the different heating systems.

 

[DHTiling]

Yes.. Ditra can be used over UFH and with no problems.. it in fact is advised to be used this way.

Schlüter-DITRA is also recommended for uncoupling of radiant heated floors consisting of thin electric heating mats. Schlüter-DITRA may be installed either above or below the heating mat. However, the uncoupling function is more effective if Schlüter-DITRA is installed above the heating mat.

http://www.schluter.co.uk/produkt.aspx?doc=6-1-ditra.xml&pg=infos

 

[astechsolutions]

Whitebeam / dave, thanks for this.

Q: for Whitebeam, if I install the ditra so it straddles the two floors will this not protect against lateral movement between them.

Q: re the heating. The matting I'm get, actually got is the 100 w/m2 of devi - 12m2. is there any restrictions on the mats durabilty by installing under the ditra??

 

[mojoammo]

When UFH mat is to be installed in conjunction with Ditra, is there also a need for insulation board under both. I will be tiling a bathroom floor which is 20mm Plywood, it needs secured and levelled, with Ditra and heat mat installed on top. Is insulation board needed, and if so does it go onto the ply first? With all these layers there will also be a step at the doorway!!

 

[Dan]

Just bumping this thread. If it's not a current topic then don't worry about it for now. Other threads like this can be found in the main tiling forum. If you do want to reply to it, please do. Your information may add value to somebody reading the forum in the future.