tiling over wet ufh

[cowgomoo]

Merry Christmas everyone ! Just a quickie before we all break up, a customer of mine is installing wet ufh in his bathroom and has been advised to top this with 6mm play and tile onto that with flexi addy. I know this to be not best practice but what would be the best solution. Would it be best to use a thin layer of slc or a cement board or just tile straight onto the polystyrene in which the pipes lay. All help appreciated. Cow.

[Sir Ramic]

Is this the PolyPipe system ?

[cowgomoo]

Good Afternoon Sir, I don't know which system it is. I will find out shortly but would it make any difference anyhow ? Cow.

[Sir Ramic]

If you search on here for Polypipe you may get more answers.

[Sir Ramic]

Or Polypipe ufh

[beanz]

I've only used the Polypipe system, but that was under oak flooring, so not much help here.. Whatever system you're using, tiling straight onto the polystyrene sounds like a no no to me. I'm interested to hear what you come up with, because if it's the same system i used, i'd be stumped at how to make it solid enough to tile onto.

[cowgomoo]

Hi Beanz, will keep you up to date when I get there ! Merry Christmas

[Rich]

I walked away from a job with a local builder because he had the same thing put down in the kitchen and wanted me to tile over the 6mm ply. He said that they used to use a cement board but it was taken off of the market and the only thing that they can replace it with is ply.

I dont care what the company say, tiling onto 6mm ply is not good enough IMO, I could move the boards up and down by pushing on them with my thumb.

[Ajax123]

6mm ply will fail. Is there a screed over the heating if so why not tile direct to the screed. If there is not a screed how does the custmer intend to get any benefit from the heating system (e.g. reflector plates, biscuit mix etc etc)

[Rich]

If it was installed the same way as mine (I dont know if it was or not), there was no screed. Just pipes, poly foam stuff and then ply. I couldn't put together a worse floor to tile onto if I tried!

[Mike]

If it was installed the same way as mine (I dont know if it was or not), there was no screed. Just pipes, poly foam stuff and then ply. I couldn't put together a worse floor to tile onto if I tried!

Yeah it sounds like no screed, if there's joists it could be possible to lay 18 mm ply and tile on that. You'd probably lose heat due to the ply. If there's no joists then its floating, yikes

tapatalk on my HTC

[Rich]

No joists on mine, the builder did say to the company about the bounce in it and they said that any thicker than 6mm and you would loose the heat as you say. They had to have carpet.

[beanz]

We did the entire downstairs of a house in the Polypipe system; overboarded with chipboard, then solid oak flooring. It took a while to get up to heat, but it did get there, so their 6mm Ply argument is crap! Ply directly onto the foam wouldn't work though, as there's no way to fix it down!?! I'm sure they do a version that can be screeded (when i say "sure", i mean that vaguely rings a bell lol!).