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Discuss Underfloor heating between joists in the Tiling Forum area at TilersForums.co.uk.

  1. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Hi all
    Just looked at a job where builder wants to put down 22m chipboard over joists then Ditra. I said nooooo. The heating system is wet on a polystyrene board with aluminium trays screwed to joists. I have mentioned giffa flooring. The joists are 400 centres so could probably use the 18mm. Any advice on this would be helpful as the builder will do whats best for a change. :rolleyes::rolleyes: 05a3b681-59a1-4306-90c9-173cb86040f3.jpg
     
  2. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    Sounds like a job for Hardibacker, No more ply, Pro Ply or that Dukkaboard XL

    I know for a fact that Pro ply is designed to go above UFH systems as I’ve read the technical data sheet. Not entirely sure on the others although it’s widely known that HB is OK above UFH.

    Would have to be a thicker board though which limits some choices
     
    • Like Like x 1
  3. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Im not in Hardie good books at the moment :D:D:D
     
    • Funny Funny x 2
  4. Paul C.

    Paul C. Trusted Advisor Professional Tiler

    Intrigued ..... what did you do?
     
  5. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    Probably said it’s carcinogenic in front of 100 people all wearing those damn Hardibacker hoodies.:tearsofjoy::tearsofjoy:
     
    • Winner Winner x 1
  6. callatiler

    callatiler Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Aberdeen
    What did you do Laurel?

    AFB940A1-634A-459E-924D-4DBD8BF7F8F8.jpeg
     
    • Like Like x 1
  7. Paul C.

    Paul C. Trusted Advisor Professional Tiler

    Ahhh.... that would explain it. Comments like that usually go down like a fart in a lift.
     
    • Winner Winner x 1
  8. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Posted someone else floor . It was 18mm ply ditra and 1800x900 6mm tile. Its been down for 2 years with wet underfloor between joists not a crack in sight solid as a rock. I said basically who needs Hardie :D:D
     
    • Funny Funny x 1
  9. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Posted on TT its kicking off again :D Seems everything I post on there gets people angry o_O
     
  10. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    Not that angry if you’re still on there ;)
     
    • Like Like x 1
  11. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    I just rant occasionally. Spoke with Bal technical not much joy even with Giffa floor
     
    • Like Like x 1
  12. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    I’d look into NMP
     
    • Like Like x 1
  13. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    I would like to use minimum 18mm ?
     
  14. Simon Dale

    Simon Dale Professional Tiler

    Location:
    Maidstone
    Just looked they do 22mm :)
     
    • Like Like x 1
  15. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    Yes, 3_fall swears by it.

    You might swear when you see the price.

    :tearsofjoy:
     
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