Priming subfloor

Discussion in 'Tilers' Talk' started by kevino, Jul 12, 2018.

  1. kevino

    kevino Member

    hello all,

    I’ve got 18mm osb subfloor,

    I’d just like to know if you prime this before sticking down cement board with adhesive?

    Thanks
     
  2. CGN

    CGN Well-Known Member

    I would.
     
  3. kevino

    kevino Member


    Thanks for your quick response CGN
     
    CGN likes this.
  4. rogerk101

    rogerk101 Active Member

    I would also screw it.

    The intense heat and drought of the last couple of months have caused so much shrinkage in my subfloor that I'm now hearing movement when I walk on my bathroom floor that has a similar make-up to yours. This floor has never done this before and it has been down for nearly 9 years. I'm just hoping it returns to being no-noise when the rains start again, but I doubt it.
     
  5. kevino

    kevino Member

    Thanks , yes I was going to screw as well , hopefully I can find the appropriate screw as I’ve seen the specific screw is too long for my 18mm board + 6mm backer board
     
  6. rogerk101

    rogerk101 Active Member

    If it were mine, I'd try to screw into the joists ... after checking that there were no pipes or wires to pierce.
     
  7. kevino

    kevino Member

    Good advice, I will do that too

    Thanks
     

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