how to glue a metal sink to a granite counter top

Factual Questions
1

I have a sink that collapsed on me today. I realize now why it happened. The sink is a metal, under-mount sink that is held to the granite countertop with nothing more than blocks of wood holding the metal to the granite with nothing more than glue! There are no clips, no screws, no nothing. Just blocks of wood that are loaded up with adhesive and holding the metal flange of the sink to the underside of the granite countertop.

Today I was working under the sink and the entire side of the sink gave way and came down on top of me! I was appalled that the sink could have been held in place with nothing more than glue!

Now my question is…how do I glue it back up there? I need some super strong adhesive that isn’t going to be affected by water/moisture and will hold for years to come. What do y’all recommend? I sure don’t want to try drilling into the granite to make holes for screws or clips. and the adhesive is going to have to adhere to wood, granite, and metal. Is this possible?

2

Any good 2-part epoxy would probably be fine. Probably wouldn’t hurt to put in more glue blocks than last time, if it failed. If worried about water causing future failure again, you could use scrap granite or other non-wood for the glue blocks, but they’d obviously be harder to notch and fit.

3

Adding to what Sasquatch said… J-B Weld two part epoxy. Works wonders. Various flavors at your local Wally World, or ACE hardware store. (You have my sympathies , I have never had a kitchen sink bite me on the nose. Knock on wood. )

4

I asked Mr.Wrekker, he said to glue it and add legs underneath the sink made from 2×4s screwed to the wood glue blocks. He’s a jerry-rigger at heart, just saying.

5

Really? Mr Wreck is and engineer?

Go Figure.

Most bottom mounted sinks have a screw in anchoring system, follow the manual…Read it first.

6

bottom mounted brackets that are glued into place.

7

There’s a rubbery glue that auto glass shops use to install windshields. Insanely tough stuff. I’ve bought tubes from the auto glass shop.

8

I bought this…hope it works. https://www.amazon.com/Never-Fall-Complete-Repair-system/dp/B075FDRTXR/ref=sr_1_4?ie=UTF8&qid=1543089529&sr=8-4&keywords=undermount+sink+support

9

That’s how I did it when mine fell out a couple years ago. And kept a car jack underneat the sink holding it up while it all dried.

10

This might help.

Choosing and using structural adhesives

http://multimedia.3m.com/mws/media/795693O/choosing-and-using-a-structural-adhesive-white-paper.pdf

11

The only real solution is to do what a professional top installer would do:

Drill holes in the underside of the granite and epoxy in threaded nut inserts. Once that cures you can’t use the clips and bolts and have a proper installation that is strong yet repairable.

12

Is that a typo? Did you mean can?

Also, I assume that such holes need to be fairly shallow, or they’d go through the entire layer of granite.