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  1. #1
    Join Date
    May 2009
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    New Jersey
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    Default Granite countertop overhange

    I know what the requirements for granite countertops are, however I need something in writing from a good source. Anyone have a link or something they can post?

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  2. #2
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    Default Re: Granite countertop overhang

    You will want to reference the Marble Institute of America and their design manual.

    I had one several years ago but gave it to another inspector when I moved and retired. Wish I still had it as they are no cheap.

    "I know what the requirements for granite countertops are"
    Would you list them here so I can see if I remember them correctly?

    Also, a good search of the archives should be able to find when I referred to them before, probably will even have section numbers in the MIA Design Guide.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Mar 2007
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    Atlanta, Georgia
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    Default Re: Granite countertop overhange

    The Marble Institute of America (www.marble-institute.com) recommends that stone 1¼ inches thick should supported with corbels if the cantilevered portion exceeds 10 inches or is cantilevered more than 1/3 the overall width of the stone. Unsupported stone slabs can break off causing injury. Repair or replace the stone countertop installation to reduce the amount of unsupported cantilevered stone.

    "The Code is not a peak to reach but a foundation to build from."

  4. #4
    Join Date
    Nov 2009
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    winslow, maine
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    Default Re: Granite countertop overhange

    Richard, a few Q&A's that may help you here.

    Granite FAQ


  5. #5
    Join Date
    Nov 2009
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    winslow, maine
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    84

    Default Re: Granite countertop overhange

    Granite can be cantilevered up to 14" if it's a large piece with sufficient support on the fixed end. It should never be cantilevered where it might receive excessive stress, however, such as where someone may be tempted to sit on it or use it as a step stool to change a light bulb. In these cases, it must always be supported.

    It's always best to assume the worst and add proper support on any extension over 6". An unsupported span of no more than 36" is usually acceptable as long as the stone is supported on both sides of the span.


    Here is an example of an island top with overhang. There are a lot of variables due to the type of stone, grain runs and grade.
    Don't rely on too many assumptions because stone is stone.




  6. #6
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Granite countertop overhange

    Quote Originally Posted by Marcel Cyr View Post
    Richard, a few Q&A's that may help you here.

    Granite FAQ
    MC:
    the link appears to be yet another tradesman who flaunts his ignorance of industry standards.


  7. #7
    Join Date
    Nov 2009
    Location
    winslow, maine
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    84

    Default Re: Granite countertop overhange

    Well perhaps Mr. Miller you can contribute more accurate facts about the product from your experience.


  8. #8
    Join Date
    May 2009
    Location
    New Jersey
    Posts
    81

    Default Re: Granite countertop overhange

    This is what I use from the marble institute.

    Unsupported overhangs shall not exceed 6" on 3/4" countertops or 10" on 1-1/4" countertop, supports/corbels must extend 1/2 the overhang depth, supports should be placed 6" from the countertop edge and be separated a minimum 30".


  9. #9
    Join Date
    Mar 2007
    Location
    Peoria Arizona
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    76

    Default Re: Granite countertop overhange

    Spans and Cantilevers. In designs where part of the countertop is spanning between supports, the length of the span shall be limited to 2'- 0" (600 mm) for " (20 mm) stone thicknesses and 3'- 0" (900 mm) for 1" (30 mm) stone thicknesses. In designs where the countertop is cantilevered or overhanging the supports, the cantilever shall be limited to 6" (150 mm) for " (20 mm) thick countertops and 10 (250 mm) for 1" (30 mm) countertops, but in no case may the cantilevered portion represent more than 1/3 of the width of the countertop. Cantilevered countertops exceeding these dimensions will require corbelled supports beneath the stone.

    See page 3 and 23

    http://www.marble-institute.com/cons...countertop.pdf

    Jeff Euriech
    Peoria Arizona


  10. #10
    petesmith's Avatar
    petesmith Guest

    Default Re: Granite countertop overhange

    That looks like a very nice kitchen.


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