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    heather brown's Avatar
    heather brown Posts: 1, Reputation: 1
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    #1

    Mar 12, 2006, 12:18 PM
    Tiling my bathrrom floor
    I am putting ceramic tile on my bathroom floor and bought 1/4 inch backerboard. I didn't put thinset underneath the backerboard between the tongue and groove sub floor. I did use the proper screws to anchor down the board but I am worried about the problem of not having thinset underneath?
    skiberger's Avatar
    skiberger Posts: 562, Reputation: 41
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    #2

    Mar 13, 2006, 06:05 AM
    The toungue and groove, this plywood or old t&g 1x boards? If over plywood you'll be OK. Just make sure its secured well. If over 1x boards it is recommended that thinset be used. The thinset helps bond but also "level" the 1/4" backerboard over uneven types of subfloors.
    I thinset 1/4" all the time. If I used 1/2" it depends what type of floor I'm going over if I thinset it or not because its thicker and wont follow the "contours" of the subflloor as much as 1/4" will.
    So basically if you subfloor is level and smooth, don't worry about it. Start tiling.
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