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Old 04-09-2017, 11:56 AM   #16
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Re: attaching undermount sink


As far as using minimal adhesive, what do you recommend? Since the sink rim would be sealed with silicone, would it be OK to do the granite with a few beads of silicone rather than industrial adhesive?
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Old 04-09-2017, 01:12 PM   #17
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Re: attaching undermount sink


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As far as using minimal adhesive, what do you recommend? Since the sink rim would be sealed with silicone, would it be OK to do the granite with a few beads of silicone rather than industrial adhesive?
You can lay down silicone on the wood and drop the granite on top.
That will hold it.

Why does your sink look like a drop in?

Did you put a straight edge across to make sure it's not sticking up? This could have disastrous consequences. The granite could crack eventually.
A bit lower than the wood is preferred.
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Old 04-09-2017, 03:47 PM   #18
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Re: attaching undermount sink


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Originally Posted by 123pugsy View Post
You can lay down silicone on the wood and drop the granite on top.
That will hold it.

Why does your sink look like a drop in?

Did you put a straight edge across to make sure it's not sticking up? This could have disastrous consequences. The granite could crack eventually.
A bit lower than the wood is preferred.

The sink is a drop-in or "tile-in" type, but I am treating it as an undermount. There is more than enough added support under the plywood lip to guarantee it will never sag. The photo does not show it well, but this cast iron sink sits no higher than the plywood top, but because the sink rim is not perfectly flat the gap for the silicone might be almost zero in one spot but 1/16" at another. Also, all the granite slabs I have seen have a fiberglass netting on the underside. Is this netting normally sanded away in the area where the sink rim would contact? If so, it could add another 1/16" to the gap all around.
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Old 04-09-2017, 05:10 PM   #19
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Re: attaching undermount sink


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Originally Posted by tns1 View Post
The sink is a drop-in or "tile-in" type, but I am treating it as an undermount. There is more than enough added support under the plywood lip to guarantee it will never sag. The photo does not show it well, but this cast iron sink sits no higher than the plywood top, but because the sink rim is not perfectly flat the gap for the silicone might be almost zero in one spot but 1/16" at another. Also, all the granite slabs I have seen have a fiberglass netting on the underside. Is this netting normally sanded away in the area where the sink rim would contact? If so, it could add another 1/16" to the gap all around.
Don't know. I've only seen quartz and marble.

Give your supplier a call and ask.
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