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  1. #1
    Randy Moore's Avatar
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    Default Garage Floor Cracks - New Construction

    New home with garage concrete deck cracking parallel to rear house wall, also down the middle. I'm thinking the heavier heated section of the house settled causing the thinner garage concrete deck to crack under the stress. Thoughts?

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  2. #2
    Join Date
    Mar 2007
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    Default Re: Garage Floor Cracks - New Construction

    I don't see a control joint. That would explain the one down the center of the slab.

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  3. #3
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    Default Re: Garage Floor Cracks - New Construction

    Are those moisture stains around the crack in pic #2?


  4. #4
    Join Date
    Oct 2003
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    Default Re: Garage Floor Cracks - New Construction

    Maybe its the weight of the water heater sitting directly on the floor.

    50 gal. at 7+lbs. / Gal. + the tank vessel. Nope that shouldn't have done it.

    Was there any cracks in the exterior foundation beam walls opposite those cracks?

    Those look larger than the normal to observe curing cracks.


  5. #5
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    Default Re: Garage Floor Cracks - New Construction

    Quote Originally Posted by Randy Moore View Post
    New home with garage concrete deck cracking parallel to rear house wall, also down the middle. I'm thinking the heavier heated section of the house settled causing the thinner garage concrete deck to crack under the stress. Thoughts?
    I would recommend that an engineer and the builder be called to address this issue. I have seen in several instances, where during the initial pour of the main slab, the cement truck parks right where the garage floor is supposed to be. After the main slab is poured, the truck moves, the displaced soil is raked back into place, not compacted, and then the slab is poured for the garage.

    If you were to drill a few holes near the cracks, you would probably find out that the slab is only 2 inches, or less, thick.

    Eric Van De Ven Magnum Inspections Inc. (772) 214-9929
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    I still get paid to be suspicious when I got nothing to be suspicious about!

  6. #6
    Randy Moore's Avatar
    Randy Moore Guest

    Default Re: Garage Floor Cracks - New Construction

    Quote Originally Posted by Eric Van De Ven View Post
    I would recommend that an engineer and the builder be called to address this issue. I have seen in several instances, where during the initial pour of the main slab, the cement truck parks right where the garage floor is supposed to be. After the main slab is poured, the truck moves, the displaced soil is raked back into place, not compacted, and then the slab is poured for the garage.

    If you were to drill a few holes near the cracks, you would probably find out that the slab is only 2 inches, or less, thick.
    Rick - I looked hard at the foundation but didn't see any cracking there.

    Eric - good call, that was my recommendation. My thought is that the builder went cheap with a too-thin garage slab that couldn't take any settling stress, especially if the heavier house settled a bit. I'd like to see the eng analysis.


  7. #7

    Default Re: Garage Floor Cracks - New Construction

    A lot of times if re-bar dowels are not put into the foundation when the floor is poured there will be settling at that area resulting in that crack.


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