rog

[rog]

hi, im about to tile conservatory floor with ufh, wot adhesive would be best,flexible?

 

[Fekin]

Using UFH you need very flexible adhesive to allow the the rise and fall in temp.

Use a 2 part flexi adhesive, that's a powdered cement and a bottle of adative liquid that you mix in with the cement and water to give added flexability, then use a flexi grout.

All adhesive makers will do a 2 part flexi cement adhesive.

 

[rog]

cheers mate,should i prime substrate its latex?

 

[Fekin]

Best to always prime with flooring.

 

[dock]

Rog

If the substrate is cement:sand screed you could fix in Keraquick adhesive without using a liquid additive. The adhesive contains a significant level of additives enabling it to be used sucessfully in this type of application. The product conforms to EN 12002 and as such is categorized as an S1 adhesive thus defining its flexibility/deformability. Grout with Ultra Color Plus (26 colours) no additive needed.

The UFH should be commissioned before fixing by bringing the floor up to the intended working temperature and maintaining it for three days. Switch off the heating and leave 24 hours to cool prior to fixing.

Following completion of grouting and filling of movement joints leave for 28 days before switching on the UFH. Bring it up to working temperature at a maximum of 5 degrees C per day. This will minimise the initial stressess on the new installation.

hope it goes well

dock

 

[grumpygrouter]

I would say that you don't really need to go to the expense of a 2 part adhesive. BAL Rapid set flexy or Ardex X7R would be fine also. Flexy grout is a definate and I would also recommend skimming over the cables with levelling compound too. Makes tiling easier and gives protection to your cables from your trowel.

 

[DHTiling]

BAL rapidset flexible and BAL superflex floor grout.......or BAL wide joint grout and GT1 admix......