Discuss Large floor ufh in the Tiling Forum area at TilersForums.com

Teddy1

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Guys. I’m going to be pricing up a large floor on Friday. 47ms in total. My first real large job to price. I’m extremely confident with the tiling side of things but the prep beforehand is what id like some advice with as ufh is in this property and I’ve never dealt with it before.

The ufh is underneath a concrete screed by the way. Should I be using something like ditra mat on this one ? Also what type of adhesives Would you recommend?

Tiles are porcelain not sure if the screed is sand and cement or anhydrite.

Any advice would be much appreciated. Thank you
 

Adey1980

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I would ask the customer when screed was laid what depth and if s&c or anhydrate as they would have had paperwork for it.
Also check ufh has been commissioned properly and check for cracks.
Take your longest straight edge to check for dips in floor etc.
 

Sean Kelly

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In a nutshell:
  1. Lay screed.
  2. Wait at least 3 weeks for movement & shrinkage.
  3. Switch on heating at a rate of 5degs every 24 hours upto max operating temp.
  4. Maintain max temp for 3 days then turn off.
  5. Wait 48hours then tile (with the heating turned off).
I've only ever tiled over sand/cement. However, our friends at BAL have a decoupling mat (Flexbone) that can be laid (loose) over anhydrite.

I use the BAL adhesives now (good prices at CTD). I'm currently using BAL Flex One.
 
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Teddy1

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In a nutshell:
  1. Lay screed.
  2. Wait at least 3 weeks for movement & shrinkage.
  3. Switch on heating at a rate of 5degs every 24 hours upto max operating temp.
  4. Maintain max temp for 3 days then turn off.
  5. Wait 48hours then tile (with the heating turned off).
I've only ever tiled over sand/cement. However, our friends at BAL have a decoupling mat (Flexbone) that can be laid (loose) over anhydrite.

I use the BAL adhesives now (good prices at CTD). I'm currently using BAL Flex One.
Thanks mate. Some great advice there. I’ve had a look at the decoupling mat today. Am I right In thinking that if it is sand and cement I can just tile straight onto it ?
 

RayTheTiler

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if there s ufh i would never tile direct onto screed.
always use a decoupling mat im on a job at present 120 mtrs on sand and cement. im using the flexbone 2 easy 3rd job with this mat and its easy to use. ctd have it on a special offer
 
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