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  1. #1
    Join Date
    Jul 2013
    Posts
    2

    Default Composite deck over concrete patio?

    My threshold from the house to the concrete patio slab is 3". I want to put a Trex like deck over the slab. The slab is approximatly 16'x16'. I have read that adding a deck with such low cleareance is a bad idea due to mold. I live in Orange county, Ca and it is pretty dry. Little rain and less humidity. I was thinking of running treated 2x4's flat for and inch and a half height then adding the 7/8" Compostite on top with hidden t-fasteners. What do you think? Tearing up the concrete is really not an option.
    Could I put some kind of 1/2" or 1/4" blocking under the 2x4 joists if you will to help with air movement?

    With the 1.5" 2x4 flat and the 7/8" composite deck I only have about 1/2" left over before I get to the level of the house threshold.

  2. #2
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: Composite deck over concrete patio?

    sounds like a good plan to me. no need to put anything under the 2x4's as long as they're pressure treated

  3. #3
    Join Date
    Jul 2013
    Posts
    2

    Default Re: Composite deck over concrete patio?

    How would you suggest I fasten the 2x4's to the patio?

  4. #4
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: Composite deck over concrete patio?

    build a framework with sleepers 16" on center and screw or nail it together. use a ramset or concrete anchors to secure the sleepers to the concrete after you have your frame all together and squared up.

  5. #5
    Join Date
    Aug 2007
    Posts
    7,084

    Default Re: Composite deck over concrete patio?

    I have done this very thing, though I wouldn't use PT 2x4, I would use solid Trex. While Trex is not structural, it doesn't have to be in this instance, you're getting all that from the concrete patio.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

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

    Default Re: Composite deck over concrete patio?

    I would use composite too and seal the outside so no unwanted/nonpaying tenants move in under the deck.

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