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Discuss DIY overlay boards for ufh in the Tiling Forum area at TilersForums.co.uk.

  1. EatingSnakes

    EatingSnakes Active Member

    Location:
    Preston
    Hey guys.

    Long time reader, first time poster.

    I've got 42mm between my current concrete slab (insulated) and my desired final floor level (tiles)

    How do I overlay my pipes?

    Is there a thin screed that can be applied over the pipes?

    Alternatively I was thinking of making some DIY overlay boards. I got the idea after reading about chipboard overlay boards and thought that I could make overlay boards out of plywood.

    I would cut 18mm plywood in strips of 200mm and wedge the 16mm pipes in between each strip.

    Each strip would be screwed into the concrete.

    The plywood would then be primed and tiles laid directly onto the plywood.

    The pipes would have plywood on both sides, concrete underneath and tiles directly above.

    The total amount of space that needs underfloor heating and tiling is 4.5 sq m

    Any advice would be much appreciated.

    ES
     
  2. jcrtiling

    jcrtiling Trusted Advisor Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Don't use plywood. Use Hardie backer board . 6mm + 12mm glued and screwed .
    Wood is not a good surface to tile to . I'm not saying this will work but it will be better than using . You could also consider putting 6mm insulation board underneath . Unless I've missed something you have room .
     
  3. Andystiletiling

    Andystiletiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Burnley
    16mm pipes plus 15mm tile and adhesive (guessing at 10mm for tile) so only need to make up 11mm, just pressure up pipes and stick a few 11mm height markers and pour a flexible leveler on till you hit the markers..
     
    • Like Like x 2
  4. EatingSnakes

    EatingSnakes Active Member

    Location:
    Preston
    Thanks for that mate.
    So that's 26mm I've got to fill.

    Any cheap and cheerful levelling compound you recommend?

    I've also heard that standard sand cement render with some sort of fibreglass additive is strong enough at much smaller thicknesses provided its bonded directly to the slab.

    Anybody have any experience with this?
     
  5. Andystiletiling

    Andystiletiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Burnley
    3 maybe 4 bags of mapei renovation screed from Screwfix should do it..
     
  6. jcrtiling

    jcrtiling Trusted Advisor Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Do not try and just do cheap and cheerful or you will end opening it twice . That is to thin for sad and cement especially with heating . As above mapei renovation has a good rep
     
    • Like Like x 1
  7. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    I think you should have a realllllly good read on this forum before you starting jumping in and using ply wood and cheap materials.
     
    • Agree Agree x 1
  8. Glynn

    Glynn Company Support

    Location:
    LEYLAND
    I would also bring to your attention of, who would the guarantee be with. What you are going to do is making up your own UFH system that does not have any testing results to back up its performance. Check with your chosen leveller manufacturer first but don't be surprised if you get a "No".
     
  9. Andystiletiling

    Andystiletiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Burnley
    Is what it is though really Glynn...back in the real world we get advised by certain manufacturers to looselay 9mm ply over ufh or pour a cement based latex over aluminium foil, sometimes you just gotta do what you know works..
     
  10. JulianSidney

    JulianSidney Billy no mates. Trusted Advisor Professional Tiler Top Contributor

  11. Andy Rhodes

    Andy Rhodes Active Member

    Location:
    Manchester
    Is the 16mm pipes already in situ
     
  12. JulianSidney

    JulianSidney Billy no mates. Trusted Advisor Professional Tiler Top Contributor

  13. EatingSnakes

    EatingSnakes Active Member

    Location:
    Preston
    Thanks for the replys fellas
    Very insightful.

    This sounds like the best option to me.
    So I can lay the pipes on top of the concrete and then poor the renovation screed directly above the pipes to the required level?

    I have been recommended something like this too:
    Concrete & Screed Fibres - 900G bag of 18mm polypropylene (PP) fibres 5060442883055 | eBay - https://www.ebay.co.uk/itm/Concrete-Screed-Fibres-900G-bag-of-18mm-polypropylene-PP-fibres-/141736144766

    Does anybody have any experience with using Polypropylene fibres to make thin sand + cement screeds?

    Thanks again

    ES
     
  14. Andy Rhodes

    Andy Rhodes Active Member

    Location:
    Manchester
    Julian cannot open that link keep getting an error code
     
  15. EatingSnakes

    EatingSnakes Active Member

    Location:
    Preston
    you have to copy and paste the text into google mate. Its the first link.

    Those ready boards are a good shout but it'll work out more expensive I think. I'll need 5 boards @ £25 each and levelling compound underneath them.

    The Mapei looks good and it'll give better heat distribution.

    I've already got lots of sand and cement and was wondering if I could make my own screed reinforced with PP fibre and SBR to fill 26mm worth of space.
    Standard screed would definitely curl but I have heard good things about PP fibre.
     
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