The Cost of Doing it Right

Discussion in 'Subfloor Preparation' started by Peter A Lewis, Jan 6, 2018.

  1. Samson

    Samson Well-Known Member

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    How do you visually identify an anhydrite floor? Is there some test?
     
  2. merit

    merit Well-Known Member

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    It looks more like a smoothing compound, usually much lighter than cement, almost cream colour or light brown. If you scratch it it will turn to powder


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  3. mjfl

    mjfl Well-Known Member

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    I love doing it and get lots of it to do as well as fitters and shops don't want to entertain the prep work
     
  4. merit

    merit Well-Known Member

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    You love doing everything mate. I wouldn’t mind grinding floors if I had your set up.


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  5. pf flooring

    pf flooring Well-Known Member

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  6. Peter A Lewis

    Peter A Lewis Well-Known Member

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    Yes, I found that article interesting too!! Anhydrite screed is not going anywhere soon, builders like it, especially with UFH. I have seen an increase in its use in my part of the country.
     
  7. pf flooring

    pf flooring Well-Known Member

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    Going nowhere for better or worse, personally don' have an issue with the stuff but I can identify and prepare it properly mind
     
  8. Peter A Lewis

    Peter A Lewis Well-Known Member

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    It separates the men from the boys!!
     
  9. mjfl

    mjfl Well-Known Member

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  10. merit

    merit Well-Known Member

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    I hire the kit when I need it mate. We only get a few a year so not very cost effective. Like I say, the last few we’ve done the screed installers have come back and removed the laitance . they all should. We mostly stick engineered wood to them and they are great for that. Find them a pain to get consistent moisture readings.


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  11. AngryAndy

    AngryAndy Well-Known Member

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    I don't think they will be dropping Anhydrite screeds.I t's so much cheaper than traditional methods. The Germans have been using it for successfully years.
     
  12. J d clarkson flooring

    J d clarkson flooring Well-Known Member

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    Did a large residential last year, builder was told he could stick polyflor expona direct to the floor...... it was a right laugh going back and ripping it all up.......
    We got a written spec of forbo for Euro Col latex and it went on great.... as long as it’s dried and well primed you can still use cement based products
     
  13. merit

    merit Well-Known Member

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    That’s a shame because it is so crap. Can’t stick solid wood floors to it. Can’t get a simple moisture reading from it. I wouldn’t trust cement products over it. I know a contractor that was told prime and 1200 will be fine by f.ball and it was until he had to lift a plank out to re cut. None of it properly bonded. We’ve had to wait over 4 months to get dry readings on them. Can’t see how new builds are getting away with it?


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  14. Mikep

    Mikep Member

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    Unfortunately these types of screeds are here to stay, we have always double primed before applying the smoothing compounds and never had a problem but some manufacturers say a single coat of primer but belt n braces is better with 2 coats of primer.
     
  15. merit

    merit Well-Known Member

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    I’ve always know it to need a 2 coat primer. The first coat disappears as soon as it touches it!


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  16. Spacey

    Spacey Super Moderator Staff Member

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    Do you’s not prime normal concrete twice anyway ? I do
     
  17. pf flooring

    pf flooring Well-Known Member

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    your taking a gamble using cement based on it, why bother risking it when there are screed specifically designed to be used with it? to me using a cement based screed over a calcium sulphate subfloor is aking to drilling and plugging ply into concrete, it might work but its not the right way to do it
     
  18. pf flooring

    pf flooring Well-Known Member

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    same here washy primer let it soak right in so that you get less pin holes trying to come up through it, saturate the floor is the best way Ihave found
     
  19. merit

    merit Well-Known Member

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    Nope, never get pinholes with a good first coat. Unless it’s a really shite concrete. If I had issues with the levelling maybe I would


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  20. Spacey

    Spacey Super Moderator Staff Member

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    Uzin 360
    First coat 1-1
    Second coat Neat

    Or

    Ardex P51
    First coat 4-1
    Second coat Neat


    FBall P131

    In the skip
     

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