Tips for removing under mount sink?

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Old 07-28-17, 04:08 PM
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Tips for removing under mount sink?

I recently had granite top installed on my new bathroom vanity. I supplied the sink. The mounted it on site. Now a couple months later the sink has a hairline crack. I believe I caused this, but I won't go in to that now.

I was going to have the granite people replace the sink, but at $250 I thought I might try it.

Has anyone done this? Do you have any tips for me?
 
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Old 07-28-17, 05:27 PM
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Has anyone done this?
On occasion, a few of us have installed a sink. Make sure that the pipes are aligned with the new sink. You may need to buy a few things so look & measure first.
 
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Old 07-28-17, 07:41 PM
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Shorty.... the question is "how to remove the sink".

As far as I know....most of those type sinks are siliconed in place under the granite countertop.
 
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Old 07-29-17, 02:30 AM
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Hello,

I watched the sink being installed. It is silicone-ed to the bottom of the granite top and has 4 wooden blocks epoxied to the granite top that function as clips to secure the sink to the granite.

I figure I will just have to knock off the wooden blocks. The trick I am looking for is getting the sink free from the granite without breaking the granite top.
 
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Old 07-29-17, 04:11 AM
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Run a thin putty knife between sink and granite. knock off blocks. I guess sink is sitting on granite not under it.
 
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Old 07-29-17, 05:46 AM
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Sorry, I misread the OP.
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Old 07-29-17, 08:09 AM
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"I guess sink is sitting on granite not under it."

The sink is an under mount. It is not sitting on top of the granite. It is below. So it is as simple as using a putty knife to slice the silicone? The way the granite people were talking it sounded like it was going to be pretty tough to break free.
 
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Old 07-29-17, 12:40 PM
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It sounds simple but things that sound simple are not always such.
It will require a putty knife but it may not break free easily.
 
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Old 07-30-17, 06:10 AM
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How about an oscillating tool, Fein, Sonicrafter, etc? Please give us feedback on how this turns out. I have a 6 yr old Blanco sink that has etched spots in it. No idea the cause, but would like to replace.
 
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Old 07-30-17, 06:44 AM
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The granite people recommended using very thin shims. It almost sounded like the thin feeler gauges I used to set valve lash on engines. I was wondering if there was something that that would help breakdown the integrity of the silicone to make it easier to cut through it .

These "easy" jobs tend to turn in to catastrophes when I do them.
 
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Old 07-31-17, 09:52 AM
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It requires something that is somewhat strong and sharp. Small/thin putty knives.

There really isn't anything that will breakdown the silicone itself. However, you can use dish washing soap on the putty knife as that will help unstick the silicone.
 
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Old 07-31-17, 11:45 AM
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Some tips:
The silicone should still be flexible. Cut the silicone slowly from inside the sink, cut between the bottom of the counter and the mounting flange of the sink.
Use plenty of blades so they are always sharp. You can also dip the blade in denatured alcohol.

Once you get a semi-deep cut you can start using a thin putty knife.
Cut off the wood with an oscillating tool as suggested, I wouldn't try to knock the blocks off.

Use these clips to install new sink:

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The flange of the clip is expoxied to the underside. Clean the underside well with a scraper/sharp chisel and denatured alcohol.
Your new sink might even include these clips.

Once the clips are secured/dried, you place a bead of silicone on the mounting flange of the sink and tighten the thumb screws. Have a helper help hold the sink up from above and also center it in the cutout.

Clean off the excess silicone quickly using cloth rags and denatured alcohol.
 
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Old 07-31-17, 12:21 PM
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Really good tips. Thank you, Brian.
 
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