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Thread: undermount kitchen sink

  1. #16
    Retired Defense Industry Engineer jadnashua's Avatar
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    There is no such thing as a standard sized sink, so finding a new one that would work and look good in the existing hole is a crapshoot...you might find one, you might not. They're called custom granite counters for a reason...they are made for both the room and the sink and valve.

    The existing sink is probably installed with both some clips and epoxy and maybe a frame underneath.

    Carefully measure the opening, and then start looking around for a sink that is close. Your better bet is to call a granite fabricator rather than an intermediary that is giving you the company line. It is possible to cut a sink hole on site, but it is messy and risky. Much better done in the shop. The existing hole may need to be revised to enable any new sink to fit. The alternative is to switch to a drop-in sink big enough to cover the existing hole(s), or live with what's there.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  2. #17
    Moderator & Master Plumber hj's Avatar
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    quote; That there is no standardization of sink size (and therefore of the hole already cut in the current granite

    The overall size of the sink is "stardard", but the sizes of the individual bowls, the location of the faucet, etc. could be different than your existing cutout can accomodate.
    Licensed residential and commercial plumber

  3. #18
    Retired Defense Industry Engineer jadnashua's Avatar
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    All the better undermount sinks come with a CAD file for the fabricator to make the 'perfect' hole for that particular sink. If they use that to cut the hole, there will be a nice, even, consistent lineup of the sink and the hole. Done wrong, there will either be a big stone overlap of the sink or the mounting flange will partially show. Now, can you get one to fit? Probably. Will it look as good as it was designed to? Probably not. Will you care if the existing sink drives you to change it? Maybe. Sinks come in various shapes - rectangular, square, D-shaped, small bowl and big bowl in a combo, big, small, big combo, and probably others. Given the depth of a standard counter, there are limits on how big a sink can be, but someones rough size doesn't dictate the actual bowl size, only the flange size. It's a crap shoot as to what you can find that will fit AND look good.
    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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