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Post Info TOPIC: How to Install Undermount Sink


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How to Install Undermount Sink


I am getting a new bathroom vanity and have settled on buying a premade vanity, a beautiful recut granite top, and an undermount sink. After being screwed by handymen and such, I think I will do this myself. I'm trying to research the best way to put in an undermount sink.

A lot of the videos show clipping in the sink below the granite, which seems flimsy to me. I would assume the best way is to put plywood on top on the vanity, cut the whole, and set the undermount on top of that and the granite over that? I've seen some undermount sink harnesses where you do that, but it literally hangs the sink level to the plywood and you put the granite on top. 

What would be the most secure way of doing this? 



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Another newbee; ye-haww!!  Welcome Shareen; there is a broad spectrum of experience and talent here, so we ought to be able to give you some help.  In my experience, our bathroom sinks were just held up to the under side of the solid surfac tops with metal clips, and screws that sort of looke like "TapCon" screws: double helix, deep and shallow threads, and apparently hardened.  What you describe with the plywood seems as if it would work fine, but you would have to be pretty precise with the inletting for the sink flange so it would seat tight against the bottom side of the granite so as to provide for a good water tight seal from the bead of caulk you would put around it before seating it.  The, of course, you would caulk the inside of the opening, too.



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Ok. Thanks. I'm just not liking the idea of screwing into granite and holding the sink up. I'm trying to figure out what the standard way to do it is, if there is one. 



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First off  WELCOME to the handyman show,, hope you stick around for awhile,, nice friendly SMALL group here, and its more than just infromation, its about friends,, hope you join us,,

As for the sink,, I think Rumbler has a good idea,, and if you watch some of these videos, they will give you some different ideas,,

I have mounted several granite sinks directly to the granite and never had a problem,, my first concern with installing in Plywood first would be leaks around the rim,,

 

 but here are some videos to maybe help you out,,

again Welcome,,,,biggrin

http://www.diynetwork.com/how-to/how-to-install-an-undermount-kitchen-sink/index.html



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Newbie

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Thanks, Rat. I've been through tons and tons of videos. I think I'm settling in the idea of using epoxy to glue screw heads to the granite, screwing it on, and then using some kind of 2 by 4 underneath the lip of the sink for extra support. They do have metal sink supports you can buy, but I don't think that would make much difference.

Now to drilling the extra holes for the faucet mount. They only have one precut.

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