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Removal Of An Under Counter Sink

 
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Old 03-19-2012, 06:32 PM   #1
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Removal Of An Under Counter Sink


I know this should go pluming but I need a fast answer.

I need to remove an under counter sink, it's mounted to either marble or granite.
Question...
Whats the best way to get the adhesive to release the sink and then clean it off so I can mount the new sink?

Whats the best adhesive to use in iinstall the new sink?

Thanks
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Old 03-19-2012, 06:36 PM   #2
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Re: Removal Of An Under Counter Sink


I just had to do this to a brand new sink. It was siliconed on to a piece of granite. Sink broke after install. I had to break the sink to get it off. It sucked.

Clear silicone and mechanical fasteners to attach it. Clean surface with acetone or denatured alcohol if it is solid surface.

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Old 03-19-2012, 06:38 PM   #3
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Re: Removal Of An Under Counter Sink


Just about every under counter sink I have heard of uses silicone for the "adhesive". One granite company around here doesn't even use any clips. Purely held up by silicone. I wouldn't recommend that though, but silicone is some amazing stuff.
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Old 03-19-2012, 06:41 PM   #4
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Re: Removal Of An Under Counter Sink


Is this a kitchen or bath sink? Stainless or china bowl? Depending o the application, there should be some screws, clips or other mechanical device that hold the sink in place. As for the adhesive, silicone or other? Best to knife in along teh edge as best you can. If you can't reach all the way thru the adhesive, then putty knife the rest for a deeper reach. Cleaning depends on the type adhesive. Silicone is the toughest to clean. I use a 'contractor's solvent' that works pretty effectively, but it is still a lot of work. Follow up with as good wash with soap and rinse so you get good bond on the next install.

I'm sure there are good plumbers here on CT,, but I would never trust this to a plumber. I've fixed too many from plumbers and granite guys poor installs.
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Old 03-19-2012, 06:44 PM   #5
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Re: Removal Of An Under Counter Sink


It's a Kolher ceramic vanity sink.
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Old 03-19-2012, 06:45 PM   #6
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Re: Removal Of An Under Counter Sink


Hammer
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Old 03-19-2012, 06:46 PM   #7
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Re: Removal Of An Under Counter Sink


Quote:
Originally Posted by KentWhitten View Post
Just about every under counter sink I have heard of uses silicone for the "adhesive". One granite company around here doesn't even use any clips. Purely held up by silicone. I wouldn't recommend that though, but silicone is some amazing stuff.
Yes, I have seen this and agree silicone is some tough stuff and holds very well. BUT, I have repaired kitchen stainless undermounts that have come loose from silicone and only partial clips installed. Getting all those clips in place must have been too tough for the original installer to bother with. Fill up a big sink bowl with water, throw in the pots and pans, and add the vibration of a garbage grinder, plus a few years of abuse..... when they called me it was just barely holding on!

I've seen this more than once.
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Old 03-19-2012, 06:49 PM   #8
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Re: Removal Of An Under Counter Sink


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No, no, no. Risk to crack the granite or marble.



You were joking weren't you?
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Old 03-19-2012, 07:29 PM   #9
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Re: Removal Of An Under Counter Sink


Ugh, I hope someone on here has a better technique than mine but I'll share. I hate when I find the sinks installed using half a tube of silicone.

I usually put a couple layers of painters tape around the inside edge and top of the sink to protect it because you're gonna be there for a while I work around the rim of the sink with a utility knife until I have cut as far in as the knife will go. I then work in a sharpened metal flat bar I have that is really thin, almost a spatula, and start to work that around the perimeter. Once you've cleared a few inches start working a slightly thicker flat bar or wedge into the clear area and keep cutting your way around with the sharpened flat bar.

I use put a stick across the top of the opening and a block below the drain with a wire wrapped around them both to keep the sink from dropping when it's free.
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Old 03-19-2012, 07:33 PM   #10
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Re: Removal Of An Under Counter Sink


I wonder, if you could get it started, whether something like a guitar string might work for sawing your way through the adhesive?
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Old 03-19-2012, 07:38 PM   #11
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Re: Removal Of An Under Counter Sink


No ones tried a MM with either a scraper blade or bi metal blade to get between the sink and top?
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Old 03-19-2012, 07:38 PM   #12
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Re: Removal Of An Under Counter Sink


Tape off the inside edge and use a knife to get it started, then try a fein took with a scraper blade, we've had to do it before when our granite guy installed the wrong color sink
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Old 03-19-2012, 07:46 PM   #13
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Re: Removal Of An Under Counter Sink


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I use put a stick across the top of the opening and a block below the drain with a wire wrapped around them both to keep the sink from dropping when it's free.
I forgot to menton this also. It is a very good idea for the countertop, the bowl and the cabinet below.
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Old 03-19-2012, 07:50 PM   #14
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Re: Removal Of An Under Counter Sink


Quote:
Originally Posted by Hmbldr

No, no, no. Risk to crack the granite or marble.

You were joking weren't you?
That's how i ended up doing it. I tried knife, fein tool, putty knife, sawing it with guitar string. China sink. No give whatsoever. It didn't harm the top; at least in my case. I got lucky
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Old 03-19-2012, 09:07 PM   #15
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Re: Removal Of An Under Counter Sink


I really like the guitar string idea. Acetone filled syringe? Next time...last time I just broke the sink. But somehow, not the counter, oddly.
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Old 03-19-2012, 09:23 PM   #16
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Re: Removal Of An Under Counter Sink


sharp putty knife and patience...this isn't a big deal
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Old 03-19-2012, 09:31 PM   #17
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Re: Removal Of An Under Counter Sink


Rex just smiles at them and they run off the top towards him.. :
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Old 03-19-2012, 11:16 PM   #18
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Re: Removal Of An Under Counter Sink


I actually didn't use a guitar string but a plumbers cable cutter for PVC pipe. It didn't work. The sink was preinstalled on the countertop when I got it so they got it on very tight.
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Old 03-20-2012, 09:15 AM   #19
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Re: Removal Of An Under Counter Sink


Quote:
Originally Posted by Tinstaafl View Post
I wonder, if you could get it started, whether something like a guitar string might work for sawing your way through the adhesive?
I carry a guitar string on my tool box when there is a concrete counter top and silicone involved.

I have yet to use it, but I've got it with me. The only uninstall I've had to face was preplanned and we set it up to come off easy.

Good Luck
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Old 03-20-2012, 07:58 PM   #20
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Re: Removal Of An Under Counter Sink


Last time I did this I told the customer's that the whole process was going to be a half day of my labor but I'd throw in an hour of me using every swear word I know. They enjoyed the show.

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