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  1. #1
    Join Date
    Sep 2004
    Posts
    40

    Default Can I Frame New Wall Directly on Garage Slab?

    Guys,

    I'm about to remodel the room that connects to my garage. We will be bumping the interior room out approx. 3 feet. We haven't yet cut open the sheetrock to confirm if this is wall is load bearing or not... BUT, we think it's non load bearing. I have several questions about the feasibility of framing the new wall:

    Question #1:
    Can I frame the new wall directly onto my concrete slab? If so, should I cut an expansion join along the new wall? Also, any problem if I decide to build a small masonry wall on top of the slab to match my current foundation?

    Question #2:
    Should I be cutting the slab "open", digging/pouring a new footing and then framing the new wall on the new foundation wall?

    Here's a Pic showing the wall/slab area:
    http://img.photobucket.com/albums/10...psf31b1eaf.jpg

  2. #2
    Join Date
    Jun 2004
    Location
    Des Moines, Iowa
    Posts
    3,764

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    Brad

    That is basically a floating slab on the interior of an attached garage.

    Typically that slab is on what is supposed to be tamped and compressed fill, but probably is not all that compressed. a lot of guys in my area will fill with sand so it settles out pretty well by the time the slab is poured.
    I have not seen a lot of problems with interior garage floor movement but that does not mean it couldn't happen.
    If i wanted a wall in my garage as you describe I would build it.
    I would frame it from slab to ceiling and drywall it. this is a non-bearing wall so you don't need to cut the slab and install a footing.

    You don't need to add the masonry at the base unless you want it for looks or protection against water when you wash out the garage. There are other ways to give this isolation at the base to protect against ant moisture wicking that would be a lot less than a masonry buffer.

    Keep in mind any settlement in the slab will create a tape crack where the drywall at the wall is taped to the ceiling rock but it is not a big concern.
    Mark Parlee
    BESI(building envelope science institute) Envelope Inspector
    EDI Certified EIFS Inspector/Moisture Analyst/Quality Control/Building Envelope II
    Level one thermagrapher (Snell Training)
    www.thebuildingconsultant.com
    www.parleebuilders.com
    You build to code, code is the minimum to pass this test. Congratulations your grade is a D-

  3. #3
    Join Date
    Jul 2004
    Location
    Fayetteville, Georgia
    Posts
    346

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    What is your plan concerning that garage door that appears to open in to the proposed new wall?

  4. #4
    Join Date
    Dec 2005
    Location
    Michigan
    Posts
    7,263

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    Quote Originally Posted by Mark Parlee View Post
    If i wanted a wall in my garage as you describe I would build it.
    The problem here is not building the new wall, it's removing the old one :)

  5. #5
    Join Date
    Dec 2005
    Location
    Michigan
    Posts
    7,263

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    Quote Originally Posted by bradesp View Post
    We haven't yet cut open the sheetrock to confirm if this is wall is load bearing or not...
    And how can you tell if it's load bearing by cutting open the sheetrock?

    Quote Originally Posted by bradesp View Post
    BUT, we think it's non load bearing.
    And what exactly leads you to that belief?

  6. #6
    Join Date
    Jun 2004
    Location
    Des Moines, Iowa
    Posts
    3,764

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    Brian

    Good Point


    dg
    I completely misread the OP about "bumping out existing"

    Brad
    Better think this one through and forget anything I said on this one
    Mark Parlee
    BESI(building envelope science institute) Envelope Inspector
    EDI Certified EIFS Inspector/Moisture Analyst/Quality Control/Building Envelope II
    Level one thermagrapher (Snell Training)
    www.thebuildingconsultant.com
    www.parleebuilders.com
    You build to code, code is the minimum to pass this test. Congratulations your grade is a D-

  7. #7
    Join Date
    Dec 2009
    Location
    Sterling Heights, MI
    Posts
    4,578

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    I would build a non bearing partition over a garage slab without cutting and placing a new foundation. You might get some slight settling which might result in a ceiling joint that looks like truss uplift. Or, you might not.

  8. #8
    Join Date
    Nov 2009
    Posts
    538

    Default Re: Can I Frame New Wall Directly on Garage Slab?

    I've done two similar to this. Both we had to cut the floor and pour a monolithic footing and stem wall. Made it easy to set the new floor joists.

    Tom

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