Tiling concrete floor and UF heating

[Spare Tool]

Ive fixed those un-coated boards a few times and never primed either side of em yet..just stick them with a wetter mix of adhesive making sure not to trap any air pockets under them. The problems here have come from trying to stick them to a floor that wasn't leveled over in the first place..

 

[The Tiler]

hi Andy
not looking for argument on the subject and maybe getting of topic as harry said, but why prime top and not bottom? Both are stuck with adhesive

 

[hmtiling]

hi Andy
not looking for argument on the subject and maybe getting of topic as harry said, but why prime top and not bottom? Both are stuck with adhesive

I wouldn't use them again but priming the top would help the ufh adhere properly and prevent any curling and also aid flow of levelling compound

 

[Dumbo]

I haven't found a background yet that priming is detrimental . No need to prime and do not under any circumstances prime are two different things. But i havent used those cheap uncoated boards

 

[The Tiler]

looks like I'm out number but will still prime both sides as I believe it should be, have seen how bad a S1 adhesive sticks to an unprimed surface and sadly not found another product I'm happy using for wet heat. As for electric I'd use a covered backer board.
looking forward to reading other posts and giving input if I think it will be of assistance, please be gentle with the newbe

 

[Andy Allen]

I haven't found a background yet that priming is detrimental . No need to prime and do not under any circumstances prime are two different things. But i havent used those cheap uncoated boards

Depends on the adhesive being used.
Some state do NOT prime cement boards or light weight backer boards...

 

[Dumbo]

Depends on the adhesive being used.
Some state do NOT prime cement boards or light weight backer boards...

I've had that before . One which springs to mind was bal saying that about ply ( not that I was tiling to ply ) but it was in a similar conversation to this . So rang them up and challenged them over it ( I particularly like challenging bal self proclaimed messiah's of tiling ) and their response was you can prime it if you want to without affecting performance .

 

[Steve01]

If nothing else please say they are porcelain tiles?

Yes polished porcelain - what difference does that make ?

 

[Andy Allen]

I've had that before . One which springs to mind was bal saying that about ply ( not that I was tiling to ply ) but it was in a similar conversation to this . So rang them up and challenged them over it ( I particularly like challenging bal self proclaimed messiah's of tiling ) and their response was you can prime it if you want to without affecting performance .

This is taken from there pdf, the adhesive is bal single part fast flex, an adhesive I use all the time on wooden substrates with cement boards...

 

[Dumbo]

Right if you look at next paragraph down that is what I challenged them on. Saying do not prime surfaces to be tiled on . I challenged them and they ok not a problem . So I wouldn't rely on that . I've not finished bal tech will get a call from Mr pain in the arse from salisbury