Boarding a concrete floor

Discussion in 'Subfloor Preparation' started by Rugmunching, Mar 1, 2020.

  1. Rugmunching

    Rugmunching Well-Known Member

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    Anyone had to do this?
    Last time I did was for a firm I subbed to many yrs ago. I'm just looking at options to raise a subfloor 12mm before screeding it o_O
     
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  2. Rugmunching

    Rugmunching Well-Known Member

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    I suppose I could use a decent backer board same what I'm using for the ufh areas
     
  3. Spacey

    Spacey Super Moderator Staff Member

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    Backer boards sounds the best option I wouldn't screed more than 6mm over it
     
  4. Rugmunching

    Rugmunching Well-Known Member

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    Why is that spacey?
     
  5. Spacey

    Spacey Super Moderator Staff Member

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    The screed may crack
     
  6. Rugmunching

    Rugmunching Well-Known Member

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    That's what is making me a little para but...
    I have to screed 8mm minimum over the boards and heating mats according to the manufacturer when I spoke to them.
    I'll be using uzins 196.

    What method/materials have you used over an electric ufh mat?
     
  7. Spacey

    Spacey Super Moderator Staff Member

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    Is this all going over concrete yeah ?
     
  8. Spacey

    Spacey Super Moderator Staff Member

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    Full stick backers boards with flexible tile adhesive Prime backerboards with Uzin 630 A light coat of Carpet spray adhesive will stick the matt down solid so it doesn't float up Then 8mm max coat of uzin 196 will get it in one hit Any feathering Use Uzin 888s
     
  9. merit

    merit Well-Known Member

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    Cement board


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  10. Rugmunching

    Rugmunching Well-Known Member

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    Yep all concrete.

    The mats I'm using is a 'sticky mat' system so hopefully no need for spray but we'll see I guess.
    Used pro warm system before but theirs wasnt a full sticky mat whereas Rayotec elite mat is supposed to be.
     
  11. Spacey

    Spacey Super Moderator Staff Member

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    Trust me the spray will make a massive difference That tape ain't as sticky as it needs to be Also Carpet spray is none water soluble Works really well
     
  12. Distinctive Adam

    Distinctive Adam Well-Known Member

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    Cement board, adhered to the floor by an ms flexi adhesive be a good option
     
  13. Rugmunching

    Rugmunching Well-Known Member

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    Which adhesives do you recommend lads?
     
  14. Spacey

    Spacey Super Moderator Staff Member

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    Just a flexible rapid set tile adhesive I cant remember the last one I use Was in a yellow bag and worked really well
     
  15. chris1973

    chris1973 Member

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    I've always gone down this route and its solid when done Screenshot_20200307-074811.jpg

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  16. chris1973

    chris1973 Member

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    Then again not if it's only 12mm good old renovation 3240 or a weber?

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  17. Rugmunching

    Rugmunching Well-Known Member

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    Going to use the mapei keraquick flexible adhesive spacey, what notch do you use for yours?
    5mm??
     
  18. Spacey

    Spacey Super Moderator Staff Member

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    I think my trowel is 6mm
     
  19. tarkett85

    tarkett85 Well-Known Member

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    Use a 10mm u notch trowel, less chance of trapped air beneath will give better adhesion, always prime.


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  20. chris1973

    chris1973 Member

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    Jesus Christ 5mm 6mm 7mm notch? Could of just screeded it up by now

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