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Mounting a sink to quartz countertop

666 Views 6 Replies 7 Participants Last post by bigJohninvegas, Apr 16, 2022

xeddog

Discussion Starter · Apr 16, 2022 (Edited by Moderator)

I just saw the post about drilling quartz countertop to mount a dishwasher and that reminded me of my issue. I had quartz installed a few years ago, and the kitchen sink, which is really just a large stainless steel tub, was glued to the bottom of the countertop in a corner. It was fine for a few years, but a while back I accidentally stepped in it when cleaning the corner window behind it. Of course, the end of the sink where I stepped broke loose.
I have been looking for an adhesive to re-glue it, but can't seem to find one. All of the recommendations I get (including a couple from actual plumbers) say to just build a framework to support it and use some silicone sealer. I'd rather not do that since there is a bunch of piping for the sink, disposer, faucets, power and water for the dishwasher, not to mention all the crap we store under there too.
So the questions are: 1: For starters, how would I remove the old adhesive? 2: What adhesive would I use to re-glue the sink in place?

Thanks,

Wayne

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waho6o9

· #2 · Apr 16, 2022 (Edited by Moderator)

I'd check out Loctite PL

https://www.loctiteproducts.com/en/products/build/construction-adhesives/pl-pro-line/loctite_pl_premiumpolyurethaneconstructionadhesive4ozsqueezetube.html

Maybe email them to be sure.

Best

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bilyo

· #3 · Apr 16, 2022

There are a few different methods. Do a web search for "how to mount an undermount sink to quartz or granite". You can decide which method works best for you.

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LesB

· #4 · Apr 16, 2022

I would call a local company that sells the countertop and see what they use. You are correct there doesn't seem to be a clear answer that I could find on the internet.

Out of curiosity I just looked at my Quartz counter/sink. The installer used a metal bracket that attached to the cabinet on eash side of the sink and hangs just below the sink. Then there bolts that went from the bracket up to the rim of the sink and they could be adjusted to press the sink against the counter top. Here is one I found on the internet. There seems to be similar ones with different end mounts. https://www.amazon.com/Undermount-Bracket-Kit-Front-Mount/dp/B00AN9F6HU

With a support bracket you can use a silicon sealant with more confidence.

I would clean the old adhesive off before remounting.

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corelz125

· #5 · Apr 16, 2022

They use a 2 part epoxy my sink they used small cut off piece of stone also to hold up the sink. Taking the old epoxy out that might not be that easy.

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squazo

· #6 · Apr 16, 2022

you're not going to believe it, but the pros just use 100% silicone.

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bigJohninvegas

· #7 · Apr 16, 2022

I would call a local company that sells the countertop and see what they use. You are correct there doesn t seem to be a clear answer that I could find on the internet.

Out of curiosity I just looked at my Quartz counter/sink. The installer used a metal bracket that attached to the cabinet on eash side of the sink and hangs just below the sink. Then there bolts that went from the bracket up to the rim of the sink and they could be adjusted to press the sink against the counter top. Here is one I found on the internet. There seems to be similar ones with different end mounts. https://www.amazon.com/Undermount-Bracket-Kit-Front-Mount/dp/B00AN9F6HU

With a support bracket you can use a silicon sealant with more confidence.

I would clean the old adhesive off before remounting.

- LesB

you re not going to believe it, but the pros just use 100% silicone.

- squazo

That mounting bracket is exactly what I have on my sink. Granite counter with a very heavy Kohler cast iron/porcelain sink.
About a year after my kitchen was remodeled, 2018. I too had the left side of my sink fall a little.
For me it was because the installer was simply incompetent. Totally failed to secure the sink properly with the mounting bracket shown.
So for a year, silicone was all that held the sink in place.
So as mentioned, I dropped the sink, cleaned up the mess. Applied fresh silicon, and adjusted the brackets properly. Has not moved since.

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