Undermount Sink Secure?

6 years ago

Hello everyone,

I have an undermount stainless steel sink installed in my marble countertop. This sink has been getting a lot of use lately, with heavy pans / dishes and water (someone who cooks a lot just moved in with me). I'm wondering how secure I can expect this installation to be? The sink is held by four sink clips / screws that were drilled into the underside of the marble (two on each side of the sink). Several pictures are below - one of the sink from the top, and others showing the screws underneath. Is this a secure method of installation? For what it's worth, I noticed there is some slight movement in the front, brass-colored bracket if I touch it (I can jiggle it back and forth a little), but the screw set inside the bracket is tight. The other 3 brackets and screws all seem secure. Thanks for any thoughts!

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PRO

Joseph Corlett, LLC

6 years ago

My apprentice is from Murfeesborough. He's heading up to fetch his girlfriend this weekend. Maybe I could send him in the company truck with the tools.

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Comments (11)

PRO
Joseph Corlett, LLC
6 years ago
last modified: 6 years ago
The only thing worse than glue blocks spanning the flange are the clips shown. At least the glue blocks fail, the sink drops, and it gets fixed. The clips just insidiously leak.

Get two Sink Straps from Regent Stone products please. Drop the sink, abandon the clips, clean the sink flange and stone bottom, install the straps, silicone the flange, tighten the straps, and reconnect the plumbing. Hour and a half labor and you can stand in that sink. Jump up and down if you please. Never gonna leak.
dmannis0719
6 years ago
Thanks Joseph. Can you elaborate what the deal is with the clips? Why do they leak but not fail? And is that over many years or is this a fix ASAP type of thing? I’m not the most handy / DIY person so would probably need help to do the straps - easy job for a plumber?

thanks!
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PRO
Joseph Corlett, LLC
6 years ago

They leak and fail eventually. It takes a while. Medium DIY skills or a plumber.
DMannisO719
Original Author
6 years ago
Wow, I see what you mean. Thanks for the tip.
Angela Zuill
6 years ago
Joseph Corlett, do you know anyone in the Nashville area in your field who does good work?
Angela Zuill
6 years ago
No way! That’s about 20 minutes from me :)
PRO
Joseph Corlett, LLC
6 years ago
He's flying this time.
nycmom
6 years ago
last modified: 6 years ago
Do you have a gap around the sink that you can see? I just dealt with this repair. The silicone seal gave way and the sink dropped about 1/4 of an inch, held up only by two clips. Spraying down the sink sides caused water to cascade out of the gap into the cabinet below. Meanwhile the weight of the sink exerted pressure on the pipes, causing a leak. The plumber removed the sink, cleaned off the old silicone, reinstalled the sink and reattached the existing clips. For good measure he installed a support underneath the sink, same effect as the sink straps mentioned above.
PRO
Joseph Corlett, LLC
6 years ago
nycmom:

Good to hear you got it fixed with a system the same as a strap. Clips, sticks, and blocking cannot provide the constant upward pressure on the bottom of a sink necessary to prevent leaking.
DMannisO719
Original Author
6 years ago
Sorry to hear that happened but glad you got it fixed. Yes, there's a small gap at the top of the sink where I can see dried silicone - so assuming that's normal? Haven't noticed any leaking coming from it.