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Thread: Bathroon Vanity Install Issue - This was supposed to be the simple part!

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    DIY Junior Member jdbs3's Avatar
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    Default Bathroon Vanity Install Issue - This was supposed to be the simple part!

    Just completed a tile floor; now reinstalling a single sink vanity with a new granite counter top. This was supposed to be the simple part. Wrong!

    The base of the vanity sits firmly on the tile and does not rock in any direction. So is it level - no! Placing a level around the top perimeter shows the left front side needs to be shimmed by ~3/16", and the back sides by ~1/16".

    Additionally, placing the granite top on the vanity shows a gap of ~1/16' in the front right corner. So while the vanity does not rock, the granite top will.

    The height of the vanity left side is 30 1/2" high, while the right is 30 9/16" high. You would expect with the right side 1/16" higher, that there would not be the 1/16" gap under the top on the right front.

    The floor in front of the vanity is close to level, possibly off by 1/32". Front to back the floor is off by ~1/16".

    So I have 2 problems: 1) assuring both the vanity and the granite top are level, and 2) assuring the granite top does not rock.

    But the #'s don't seem to work. Given the vanity top does not rock both with and without the granite top, I don't see how shimming under the bottom of the vanity will resolve either of these problems. If I raise the left front ~3/16", then the left side would be ~1/8" higher than the left side; I'd expect this would throw off the granite top even more.

    Another alternative might be to leave the vanity as is on the floor, and plane the perimeter down. But planing of 3/16" from left to right and 1/16" from front to back, while assuring the perimeter all comes out level would seem to be a very difficult task to get right.

    If I don't care about the top being perfectly level, then just shimming the right front corner of the top would eliminate the rocking.

    While I expect the solutions will be trial and error, what is the best way to proceed? And is just shimming the top right corner sufficient to resolve the granite from rocking and avoid the granite from cracking in the future?

    thanks

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    DIY Senior Member dj2's Avatar
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    1st problem: the floor is off, but you can live with that.
    2nd problem: the vanity is off, you better make it level, otherwise your top will never will be level.
    3rd problem: your granite is not perfect, you can work around it by shimming.

    So what do you have to do now? the tiles are already set, start with the vanity.

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    Test, Don't Guess! cacher_chick's Avatar
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    I tend to believe that you are over thinking this. I use pocket change to level the top and then carefully set it in a bead of clear silicone on the vanity, which will provide adequate support for the life of the unit.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Normally I would shim if needed to make sure the box is level, regardless of the floor condition.

    Then the counter can set on a level box. A few dabs of caulk will settle down the countertop to the frame of the box.

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    DIY Junior Member jdbs3's Avatar
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    Default Update

    Terry,

    Quote Originally Posted by Terry View Post
    Normally I would shim if needed to make sure the box is level, regardless of the floor condition.
    Ok, I'll do this. But from what I have seen, while the vanity will now be level, the granite top will still rock with the 1/16" under the right front corner.

    I called the manufacturer and asked about putting a shim under that corner. This steadies it. They said they would not recommend doing this; that it might lead to the granite top cracking in the future. Not sure why since I got this feedback from a consumer relations rep who called the manufacturer.

    The only other thing I can think of is to plane down 90% of the top until all sides are now level. But as noted, I'm not convinced this is easily doable given corner bracing, etc.

    Is this the correct/best way to resolve the rocking top? Or are their other alternatives?

    thanks

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    Forum Admin, Expert Plumber Terry's Avatar
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    the granite top will still rock with the 1/16" under the right front corner.
    Yeah, well that's why I would put a few drops of clear polyseamseal between the granite and cabinet.
    We're not talking 3/8"
    You can barely see light through the crack with 1/16"

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Get out a long straight-edge and see what's really happening. My guess is that the vanity is bending to fit the floor. THen, if you screwed it to the wall to anchor it, that can mess things up, too. Course, the vanity could be off. Granit slabs are usually quite flat, course, there's always the exceptions. Was this a pre-made one, or one you had made? Some of the premade ones (i.e., with the sink hole and faucet holes already in them) are volume manufacturered overseas (China?), and the slab they used may not be the best quality.

    Is the slab 2cm or 3cm thick? the thinner stuff is more likely to crack if you don't take care in shimming well and often enough to fill gaps. The thicker stuff is stronger. But, some granites are much stronger than others. If it was a premade top, there may be some veins in it that weaken things.

    Is the backsplash attached (if it has one)? Your wall may very well not be totally flat or plumb - this is not that unusual, especially if there's a drywall seam in the equation...that often creates a wide hump in the wall.

    To get the vanity to sit right, you may need shims at the back to accommodate any inconsistencies...if you screw it to an uneven wall, guess what, it will warp the cabinet if it doesn't break a seam.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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