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    Dave Williams's Avatar
    Dave Williams Posts: 1, Reputation: 1
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    #1

    Feb 10, 2007, 07:37 AM
    Is backer board needed under porcelain tile
    I am installing porcelain tile in a 30 sq ftbathroom. Presently there is carpet on new plywood. No damage to the plywood. Do I need to install backerboard first or will the good plywood be OK without the backerboard?
    Nwptsailor's Avatar
    Nwptsailor Posts: 56, Reputation: 4
    Junior Member
    		  
    #2

    Feb 11, 2007, 06:24 AM
    Quote Originally Posted by Dave Williams
    I am installing porcelain tile in a 30 sq ftbathroom. Presently there is carpet on new plywood. No damage to the plywood. Do I need to install backerboard first or will the good plywood be OK without the backerboard?
    Tile hould have a minimum of one inch and a quarter thickness of wood. More is better.
    So the plywood you see is probably on top of some other sheathing. Find out exactly how thick all layers are togther . Add if necesssary. Add another layer if you have a spongy area.
    Backer board in general will lead to a longer lasting job.
    mjflynn's Avatar
    mjflynn Posts: 1, Reputation: 1
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    #3

    Aug 13, 2013, 12:56 PM
    I have installed 1/4 inch hardi backerboard and glued down and did not realize I needed a 1/8 in gap for expansion, can I just make a gap around the walls for expansion?
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