What products......what order?

[daztheoneclaw]

Hi guys. I'm renovating our bathroom and we want electric ufh. I want to ensure the job is 100% correct so I am looking for a bit of advice on the following if possible please. I have a tongue and groove floor on timber joists so I will need to cover this with a backer board? Hardibacker or Marmox? Which is deemed more suitable? Then do I fix the mat directly to this or do I need to add insulation board first? When the mat is fixed do I cover with a self leveller, if so which.......or do I just go straight for a flexible adhesive over the mat? Tiles will be Gemini Dual Core. Advice much appreciated.

 

[peteablard]

Is the floor deflection free? I always prefer to cover the matt with SLC, less risk of damaging the cable that way.

 

[Rookery]

I would do it thus:
Screw boards to joists
Overboard with 10mm Marmox or similar insulation boards, glued and screwed - Keraquick adhesive
Fix ufh cable/mat to insulation boards
Cover cable/mat with slc - Weber Floorflex
Tile - Keraquick adhesive
Other people may do it differently.

 

[Uheat - Keith]

We would say same as Peteablard & Rookery above.
Always use;
powdered flexible self-levelling compound. AND/OR
powdered flexible tile adhesive.

Warm regards, Keith - Uheat.

 

[daztheoneclaw]

I would do it thus:
Screw boards to joists
Overboard with 10mm Marmox or similar insulation boards, glued and screwed - Keraquick adhesive
Fix ufh cable/mat to insulation boards
Cover cable/mat with slc - Weber Floorflex
Tile - Keraquick adhesive
Other people may do it differently.

Thanks for the reply. That is exactly the info i was after. I have tiled the ensuite and used hardiebacker to give a good stable surface to bond too. Presumably the Marmox replaces this? I presume that the Keraquick will be suitable for the wall tiles too? I used Mapai Super Flexible Adhesive in the ensuite is Keraquick more suitable due to the ufh?

 

[Rookery]

Yes the Marmox is a cement faced insulated tile backer board. You could use Keraquick on the walls but you may find a standard setting adhesive more suitable such as Mapei Adesilex P9 or Keraflex. Keraquick is suitable for UFH floors as its flexible and fast setting.