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Discuss Cemfloor liquid screed with heating in the Underfloor Heating Forum area at TilersForums.co.uk.

  1. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    I thought I would put this on as these screeds are becoming increasingly popular and there seems to be incorrect advice been given by the screeders. Pumped in, rapid drying cement based screed with underfloor heating which they claim you can tile on directly after 7 days and you don’t need to sand, well you do need to sand as there is clearly laitance on the surface, I used a diamond cup to sand this but it can be sanded using a course abrasive paper as it’s much softer than anhydrite in my experience. This was left 28 days before I tiled it, and the underfloor heating was commissioned correctly. I fitted durabase mat as there’s going to be some extreme temperatures in this room and with the screed being new. Here’s the job, at a listed 16th century old vicarage in Derbyshire.


    First picture shows the screed when first poured and the curing agent they spray on top, second pictures show the laitance, then it after sanding.


    23E66838-AE99-429A-90D5-7A7EFC6632B4.jpeg

    94BBDB42-8482-4762-B98E-1C374F74DF92.jpeg 799340B9-5924-49DD-87B5-A58EEA201220.jpeg 6545C859-A3C9-429D-B73B-94F8E10EA606.jpeg F59D0D7F-57D9-4756-AC5A-7FB1D996F903.jpeg E45C0E23-C822-481D-9D7B-8AAC12E09EBD.jpeg A603373D-3B9A-45FF-91E1-F8BA10B845C5.jpeg 5C050DD4-AF45-4333-9D9C-D85883AC3076.jpeg 553EA1BB-CF8E-4470-B978-AE928994F8C5.jpeg 9D8CB267-CD1A-439D-BAC0-14CF658C5FC5.jpeg B9402408-1055-4122-85A4-819BE35D4FE6.jpeg B31F52AF-FFDD-484F-AA8C-0C12A9C8464A.jpeg 9BCBB271-FEF3-4DD2-B1DC-07D280299F22.jpeg 33C6C602-E974-4F77-8DE5-2B2149211DCA.jpeg
     
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    Last edited: Jun 2, 2018
  2. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner

    Location:
    BELFAST
     
  3. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner

    Location:
    BELFAST
    Lovely job Andy. I really like the bond in the set out, it really does the tile justice :thumbsup:
     
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  4. Ajax123

    Ajax123 Tilers Forums Pro - Screed Advisor Trusted Advisor Professional Tiler

    Location:
    Lincolnshire
    Nice to see the screed treated with common sense rather than blind faith that the screeders was giving good advice. If he said it could be tiled after 7 days and it didn' need sanding he was talking bull...
     
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  5. Wishiwasatoptiler

    Wishiwasatoptiler I'm either plastered or out on the tiles Professional Tiler

    Location:
    Northeast
    Looks a top job fella. Great info to. Cheers for sharing.
     
  6. LEE MAC

    LEE MAC Trusted Advisor Professional Tiler JOTM Winner

    Location:
    BELFAST
    @Localtiler@Localtiler, Andy what tile was used on that floor?
     
  7. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    @LEE MAC@LEE MAC i am not sure of the name of it, was supplied by the customer. Spanish porcelain
     
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  8. TheAofT

    TheAofT Active Member

    Location:
    North London
    Real beauty:clapping:...
    Thanks for sharing a valuable info.
     
  9. Paul C.

    Paul C. Professional Tiler

    Good Job Andy and good info about the screed too. Likey biggy muchly's :)
     
  10. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    How flat/level was it Andy?
     
  11. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    It was perfectly flat harry!
     
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  12. Balloo

    Balloo Active Member

    Location:
    Belfast
    I was supposed to start a 400m 1200x200 plank on 21st may on cem floor everything was good to go but botoment adhesive CO put a stop on the job said the floor needed 3week drying , and would need decoupling matt ,???? .
    Its messed up my schedule really bad , but better safe than sorry I guess , ?
     
  13. Balloo

    Balloo Active Member

    Location:
    Belfast
    Forgot to mention I was thinking of hiring a lawn roller to press down the matt because of how much there is , is this a good idea ?
     
  14. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    Balloo, if the floor doesn’t have underfloor heating then you can tile it straight away if your fitting an ditra or dural.
     
  15. Balloo

    Balloo Active Member

    Location:
    Belfast
    Has ufh
     

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