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  1. #1
    Join Date
    Jun 2012
    Posts
    81

    Default concrete subfloor- 3/4" hardwood install questions

    so I have an addition I will be putting 3/4" red oak flooring in. the subfloor is slab on grade, it has 6mil poly under the slab and was poured a year ago. I will be putting 3/4" plywood over the concrete then the hardwood on top of the plywood. I have 2 questions- 1. do I use t-g plywood or square edge leaving room for expansion? 2. what do I put on the slab prior to the plywood? I will be gluing AND nailing or screwing the plywood down. is the glue enough of a moisture barrier? the grade is below the slab and there is drain tile installed around the exterior footing.....
    thanks!

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: concrete subfloor- 3/4" hardwood install questions

    Depends on what is common in your area.

    ROund these parts we install 'sleepers' on the slab, usually 1x3's, perpendicular to the run of the hardwoods.

  3. #3
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: concrete subfloor- 3/4" hardwood install questions

    same here, 1x3 PT sleepers with T&G plywood on top. no need to worry about expansion of the subfloor.

  4. #4
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,598

    Default Re: concrete subfloor- 3/4" hardwood install questions

    Slightly different over here: 6mm plastic over the slab, 3/4" plywood (reg sheets) nailed down into the slab, then the floor.

  5. #5
    Join Date
    Jun 2012
    Posts
    81

    Default Re: concrete subfloor- 3/4" hardwood install questions

    no room for sleepers- subfloor is set down 1-1/2" 3/4 for plywood and 3/4 for flooring.

    I planned on the poly but think the fasteners thru the plywood into the slab will negate the effects of the slab?

    I think a troweled adhesive with moisture resistance for the plywood?

  6. #6
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: concrete subfloor- 3/4" hardwood install questions

    only if it's PT plywood

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