Undermount sink coming loose, solutions?

As someone with no experience on this, I would assume you would need to remove the sink, scrape off the old adhesive and reapply it. Then build some sort of supportive bracket under/around the sink attached with screws not glue to the cabinet.

That is probably the only way to ensure that it doesn't fall again.

Maybe someone with more experience will say I'm wrong though.

Undermount Sink Installation Videos

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They are usually installed with metal clips and a special tool is used to cut a slot to anchor them.

Metal or porcelain sink?

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Stainless. Eh, it’s a higher end place. Likely top of the line installer at the time. Doesn’t mean they didn’t cut corners. But their method was basically using diy materials of what I’ve seen online. If they installed it with the sink facing up, I can see the craftsmanship doing fine. Hard to say.

I like the idea of putting a 2x4 on the top and bottom with a bolt squeezing the 2 together to hold into place while it dries. May try that.

You can screw some wood blocks (1x2) to the side of the cabinets.

Or get some metal pipe strapping and run it under the sink bowl and screw the straps into the sides of the cabinet.

Or do both options above.

I've done this repair a few times. Made a clamp system using a pair of 2x4's, couple of feet of all thread, nuts, & washers. Basically one 2x4 across the top and another under the sink across the drains with all thread connecting. You'll have to remove the sink baskets and whatever plumbing you have attached to the sink but it's a far better method than trying to wedge 2x4's or whatever from underneath. You'll be able to precisely set the sink in place and clamp it to the granite to give the silicone the best chance to set. I also used an anchor system with two-part epoxy (regular setting JB Weld, don't even try the fast setting stuff) and scuffed the anchor points on the granite with a diamond abrasive point on an oscillating tool. Don't be in a hurry, let everything cure overnight.

Edit: Completely remove the sink and remove all of the old silicone too. I used a razor scraper, acetone, and green scrub pad. You aren't going to see the lip of the sink so don't go light with the green pad. Also, use the blue label GE 1* silicone. Don't use anything that says paintable or offers extra flexibility or stretch, you aren't caulking a seam here, the silicone is going to be the main adhesive at work. If you need to go back and run a clean seam of sealant on the inside edge of the sink later, choose whatever mold-resistant kitchen/bath caulk you want.

Will that epoxy hold the brackets in place until it dries? I tried some other epoxy as a quicker fix and it wouldn't hold the old blocks that were originally used in place while the epoxy dried?

I think I'm going to buy something like 1/4" pvc and make some large wedges to hold the brackets in place until they dry? I can cut them clean, put a cap on them, drill a hold in the cap, then wedge them in to "hold" the brackets while the epoxy dries.

I need to do like 10 brackets, the issue I see is I don't want to make some epoxy, hold one bracket for 20 minutes while the epoxy dries, then make another, etc.

ETA: I was also hoping to not have to remove my plumbing from under the sink and off the sink, and completely remove the sink, but I'll just do this the right way and take the sink off, clean everything up, then start over from scratch the right way essentially.

I second this. I had a bathroom sink fall while the water was running. Bought the brackets and epoxy, fix the broken sink and went around to the others too.

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I like the idea of putting a 2x4 on the top and bottom with a bolt squeezing the 2 together to hold into place while it dries. May try that.

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use a ratchet strap between the two boards, much easier than a bolt and you'll be able to tighten it up well. If it's a double basin sink, I'd run a ratchet through each drain. Also run the 2x4s perpendicular to each other so there's pressure on the sink in two directions instead of one.

I actually bought all of the above, I don't feel like screwing around. It was like $60 on amazon for both the brackets that you epoxy and then wingnut and these. I want to do it right once and be done. It all comes today so I'm planning on working on it tomorrow.