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Thread: Confused-Keraflex maxi on ply- Do I need to prime??

  1. #1
    cundick
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    Default Confused-Keraflex maxi on ply- Do I need to prime??

    Hi
    Hope someone can resolve my question.

    I am laying my first floor.
    I have overboarded with 9mm ply onto approx 22mm long strips of chipboard. Very solid.
    Screwed down every 150mm and 100mm at joints.

    I have Keraflex Maxi to lay 300 x 600 porcelin tiles.
    I alway intended to prime the top of the ply before laying the tiles,
    however I was told when purchasing the adhesive there was no need to prime the top of the ply.

    I was just about to start laying the tiles, but the question of whether I should prime or not is still a concern.

    Please can someone confirm which way to go and if I have o prime what would you recommens


    Steve

  2. #2
    DHTiling
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    Default Re: Confused-Keraflex maxi on ply- Do I need to prime??

    Hi steve..welcome...

    Priming ply is not nornally needed....But on that thickness of ply the moisture in the keraflex maxi might buckle it , as the maxi is slow setting..

    An S2 fast set would be better.. IMO..to thin

  3. #3
    cundick
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    Default Re: Confused-Keraflex maxi on ply- Do I need to prime??

    Hi Dave

    Thanks for getting back to me so quickly.



    A bit concerned in what you have said about the ply buckling.
    Would primming help the situation?
    If so what do you recommend.


    Steve

  4. #4
    Tilers Forums Arms pjc's Avatar
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    Default Re: Confused-Keraflex maxi on ply- Do I need to prime??

    no i think the ply to thin and the slowset will let to much moisture into the ply
    Last edited by pjc; 18-10-2009 at 08:23 PM.

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    Default Re: Confused-Keraflex maxi on ply- Do I need to prime??

    You will be better of using a tile backer board rather than the ply but if you insist on ply then it should be 18mm thick and primed on the under side and the edges.

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    Default Re: Confused-Keraflex maxi on ply- Do I need to prime??

    since the ply has already been layed prior to the question being asked i would suggest using the Mapegum wps before the Maxi to be sure - but if you could get the Primer S it would also be more than suitable.

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