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    FINISHER's Avatar
    FINISHER Posts: 2, Reputation: 1
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    #1

    Mar 15, 2008, 04:37 AM
    No thinset below Hardie Backer
    I installed 1800 sf of 1/2" Hardie backer, I first used self leveler in many area's to eliminate uneven surfaces. I then screwed the backer board down every six inches over the self leveler and 3/4" plywood. I was unable to put thinset down because it would have prohibited me from opening entrance doors throughout the house (the tile was thicker 5/16 of an inch). I have been told that the tile or the grout joints will crack. I also installed expansion joints at numerous locations. What is your take on this?

    Thank you
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
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    #2

    Mar 16, 2008, 06:22 AM
    If by "screwed the backer board down every six inches " you mean around the perimeter and in the field, you should be just fine. Main thing is the stiffness or rigidity of the floor.

    I am curious thought, why can't you trim doors slightly?
    FINISHER's Avatar
    FINISHER Posts: 2, Reputation: 1
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    #3

    Mar 16, 2008, 03:46 PM
    Quote Originally Posted by hkstroud
    If by "screwed the backer board down every six inches " you mean around the perimeter and in the field, you should be just fine. Main thing is the stiffness or rigidity of the floor.

    I am curious thought, why can't you trim doors slightly?
    The doors are fiberglass and steel.
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