replacing undermount sink

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Old 04-02-12, 11:25 AM
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replacing undermount sink

Hello all, Not sure what to do. We have nice granite countertops in our kitchen. (recently purchased the house) but the undermount sink needs to be replaced. Can we take up the granite and replace the sink without causing a lot of damage to the cabinets or countertop as we would want to reuse the countertop again. Not sure if this can even be done. Thanks for any advice.
 
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Old 04-02-12, 11:29 AM
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Can't you access the sink from underneath?
 
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Old 04-02-12, 12:16 PM
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sink has lip

The undermount sink has a lip that basically allow it to sit on top of the edges of the cabinet/plywood cutout. The granite is then on top of the plywood and sits on top of the lip so that it looks built in.
 
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Old 04-02-12, 12:20 PM
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Ouch....that seems like a silly way of doing it.

From what I know...removing the granite would be asking for an expensive replacement.

Would it be possible to cut the old sink out and use a drop-in?
 
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Old 04-02-12, 12:22 PM
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I'm with Vic - given what you have, my first thought is to cut the plywood so the existing sink can fall out rather than lifting the granite.
 
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Old 04-02-12, 12:52 PM
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drop in

Thanks, yes the drop in is second on the list and probably a LOT less expensive. I just thought I would see if option 1 would even be possible. I'm sure the plywood is screwed into the cabinets and then they used some type of glue to glue the granite to the plywood. Probably a lot more work and cost.

Thanks
 
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Old 04-02-12, 12:57 PM
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And I sorta meant just cut the sink up near the lip with a grinder and leave the lip sandwiched between the ply and the granite.
 
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Old 04-02-12, 03:50 PM
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If you have plywood under the granite, you may have 2 centimeter thick granite. If that is the case, you will want to leave the plywood in tact. Do not cut it. Vic's idea of cutting out the sink itself might work.
 
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Old 04-03-12, 05:37 AM
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2 cm thick granite would make the plywood structural and render my suggestion a bad idea
 
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Old 04-03-12, 08:33 AM
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I replaced an undermount sink that had granite countertops. The sink lip DID NOT extend over the cabinet sides. The sink was supported on each side with a 2X4 on it's side that was screwed into the cabinet. Take a look underneath yours to see what's what.

Replacement was a simple matter of removing the center stile of the cabinet along with the doors. After disconnecting and removing all of the drain and supply piping and the faucet/sprayer assembly I lowered the sink and took it out through the cabinet opening. The new sink went in the same way. I used cabinet jacks to position and support it. The only oops that happened is that I messed up the cabinet stile when I removed it and I ended up making a new one.

Be aware that when I said it was a simple job that doesn't mean an easy one. My sink was a double bowl cast iron and it weighed a ton. It took two of us to replace it.
 
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Old 04-09-13, 05:17 PM
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This is how I did it, and I have it done at least three times with great success:

1. Loosen the bond between the sink and the granite and the plywood under. This can be done by patiently inserting a 2" putty knife in between. Use hanheld hacksaw if screw is encountered.

2. Remove all plumbing connections and put a stack of wood under the sink to support it.

2. Cut the sink around the perimeter from the top with a grinder. Yes the sink will fall and the support you placed under the sink will catch it. It is important to control this fall or else you may damage the granite.

3. Now, your sink is gone but the outer perimeter piece is still between the wood and the granite. Re-separate the remaining part of the sink from the granite and the wood, using the putty knife and hack saw id screwed.

4. From under the counter, extend the cut(cutting through the wood) on corners to have four separate remaining sink parts. This step will let you easily pull those remaining parts of the sink.

5. Fill the cut wood with good wood glue.

6. Install your new sink as top mount. This is the simpliest.

7. Installing the new sink under-mount is posible, and I have done it, but more steps are needed such as, trimmint he under wood to receive the new sink, then installing/glueing 2" x 3" lumber under-around to hold the sink. This steps is more complicated and ambitious. I suggest stick with step #6.
 
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