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Thread: anchoring dishwasher to granite counter?

  1. #1

    Default anchoring dishwasher to granite counter?

    hi, my mother in law recetly had her kitchen re done. Apparently the contrator did not anchor the dishwasher to anything and is easily moved. The contertops are granite, which he did not install. Typically,we think these things are screwed it to he counter top to anchor it. Is this different with granite? If so, how? Thanks bunch, Janine

  2. #2
    Architect Spaceman Spiff's Avatar
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    if you have a gap between the mounting tabs and the bottom of the counter, cut a 24"x1-1/2" strip of wood the gap. The thickness of the wood will need to be the same as the gap between the DW tabs and the counter. Use silicone to adhere the wood to the bottom of the granite with a bead the entire length of the strip. Hold it in place over night with a couple strips of masking tape. The following day you can remove the tape and screw the tabs into the strip just like any other wood based counter top. It would also be a good idea to finish the wood to match the cabinets.

    If there's no gap then it is a different matter... Let us know if there's no gap.
    Spaceman Spiff aka Mike

  3. #3

    Default Anchoring DW

    Why not drill pilot holes with a 1/8" masonry bit and use either very short 3/16" tapcon screws or else plastic cement anchors with short galvanized screws.

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    Moderator & Master Plumber hj's Avatar
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    Default dw

    Check your dishwasher installation manual. Often the countertop clips can be moved to the sides of the DW so they can screw to the sides of the cabinet when the top is granite or other hard materials. If anyone is going to drill, or tap screws into it, it had better be the granite installer/supplier, or you may wind up buying a new countertop.

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    Plumber jimbo's Avatar
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    I'm with hj on this. I would never touch the granite with any tool tougher than a toothpick!

    New dishwashers I have seen do have a method to move the clips to the sides, and a typical granite installation has a filler strip across the DW opening, so the DW can be secured to it.

  6. #6
    Master Plumber Dunbar Plumbing's Avatar
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    Thumbs down

    I've had my share of these granite countertops. NOTHING get's anchored to the granite.

    Side clips as mentioned is the only anchoring done.

    I now have a trumped fee above and beyond the hourly rate now to deal with these )#@!ing countertops.

    If they don't like it.......go find someone else more hungry; I'm not wasting my time on them anymore. They are just too much trouble and the customer has no realization to why they are so difficult.
    Last edited by Cass; 05-13-2007 at 04:51 AM.
    Read what the end of this sentence means.

  7. #7

    Default Anchoring to Granite

    What's the problem with anchoring to granite? Does it void the warranty? Does it have a tendency to crack if you try to drill a little pilot hole? Or is it just so expensive that you don't want to even take a chance on messing it up?

    Does anyone have any anectdotal evidence of ruining a granite countertop?

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    Some granites have lots of natural inclusions. Most anchors rely on an expanding joint. It is near an edge. Drilling puts stress on the material. Vibration from the DW and slamming of the door generates impact. It is not worth the risk of ruining a potentially thousands of $$ counter slab when you can anchor it in another way that doesn't put it at risk.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  9. #9
    Architect Spaceman Spiff's Avatar
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    if you drill the granite it could crack or the hole will blow out on the bottom side, neither of which are good...
    Spaceman Spiff aka Mike

  10. #10

    Default

    Thank you all very much, we appreciate the info...makes sense about the granite, and we will check out the movable clips- janine

  11. #11
    Moderator & Master Plumber hj's Avatar
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    Default liability

    Verdeboy. ALL OF THE ABOVE. The only way we would have anecdotal stories to tell is if we violated our good sense about not touching it. But I know many granite installers who have had to replace countertops because it cracked when they did something they shouldn't have.

  12. #12
    DIY Junior Member stx333's Avatar
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    Just a quick suggestion, I usually glue the clips up to the counter with commercial epoxy glue which I get at Fasco, Miami

  13. #13
    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by hj
    Check your dishwasher installation manual. Often the countertop clips can be moved to the sides of the DW so they can screw to the sides of the cabinet when the top is granite or other hard materials. If anyone is going to drill, or tap screws into it, it had better be the granite installer/supplier, or you may wind up buying a new countertop.
    Agree 100%. Last year we put in quartz countertops. The dishwasher got clipped on the sides.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  14. #14
    Plumber Cass's Avatar
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    Default

    I also agree with all the above caution statements.

    If you must have it attatched to the granite have the granite installers do it with the understanding that they will replace it if there is a problem.

  15. #15
    Plumber Cass's Avatar
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    Verdyboy, all I can say is if you do a job like that I hope you have deep pockets.

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