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How to undermount sink to granite

14 years ago

After spending countless hours on the vessel sink height issue, we have decided to go with an undermount. That is if the granite yard doesn't charge to much.

DHs first question is how do you attach the sink to the granite? I have been searching the internet and this site but can't find good information. I have found many completely useless websites.

We will ask the granite yard about this on Saturday but would welcome any information.

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Comments (4)

mariofo
14 years ago
I just got a vanity installed this past weekend and they didn't use the mounting clips. They put wood on each side of the cabinet for the under mount sink lip to sit on. It worked out well and the sinks look nice.
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sunshinestone01
14 years ago
You also could use bolt to fix the sink to the top, but you need to drill four small holes in the granite top first.

Here is a link that might be useful: Stone Basins Supplier
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babyboomer1001: 100% silicone is perfect caulk between a sink flange and the bottom of stone. Polyseamseal and other Latex caulks are not; they do not have the adhesive stickiness or flexibility of silicone. It's best if you can pull your sink, clean the sink flange and stone bottom, recaulk with silicone and reinstall the sink. If this isn't reasonably possible, use a stiff plastic shim or plastic laminate to gouge the caulk out, clean the gap with acetone, and recaulk with silicone. Ignoring a leaking sink flange can have catastrophic consequences if your top has been "rodded" or reinforced with steel. If the fabricator used the wrong rod and/or the wrong bedding the rod can rust and blow up your top. I've fixed about 8 of these so far and it runs around $1,000.00-$1,600.00.
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the only times we did use support for sinks was for cast iron sinks, which were really heavy, like 90lbs. We never came cross problems like this, we didn't have anything else to use. So we used 2-3 2x4"s. And built kind of like a frame to support the sink in case it gives the granite too much pressure. For your case, since you are using stainless steel sinks, it's not super heavy like cast iron, it will hang by the plywood. Add cleats on the side of the cabinets so that cabinet actually handles part of the weight. But now the market has something called undermount sink setter, I never used my self, but it looks like a easy tool, search around and see what other people say about this, and maybe you could use this.
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ponderous1
14 years ago
Don't bother with the link....it is only a sales website.
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debrak_2008
Original Author
14 years ago
We ordered the granite today with a top mount sink. The granite cost for undermount was just too high. We found a Kohler Devonshire top mount that matches our tub. The granite is steel gray and cost us only $360 for 55" with one sink, no backspash, not installed. We can finally move on to other decisions!

ponderous1 thanks for the warning.

Thank you all for responding to my questions regarding the sink and countertop.

Here is a link that might be useful: The sink we decided on.
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