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How to Secure an Undermount Kitchen Sink | Ask This Old House

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Plumbing and insulation
By web3d
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Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner reattach an undermount kitchen sink to a granite countertop. (See below for a shopping list, tools, and steps.)
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Shopping List for How to Secure an Undermount Kitchen Sink:
– Undercounter-mount sink clips (comes with wing nuts and machine screws)
– 1-inch fender washers
– Silicone caulking
– Length of string
– Wood braces

Tools for How to Secure an Undermount Kitchen Sink:
– Screwdriver
– Wrench
– Caulking gun
– Putty knife

Steps for How to Secure an Undermount Kitchen Sink:
1.Turn off the water supply to the sink.
2. Disconnect plumbing connections using a wrench and unscrew by hand.
3. Disconnect any remaining sink clips, using a screwdriver.
4. Remove sink from granite and set aside.
5. Scrape off leftover caulking on the sink and the underside of the granite countertop using a putty knife.
6. Insert undercounter-mount sink clips into the existing holes in the granite.
7. Loosely screw the machine screws into the brass threaded insets using a screwdriver.
8. Put a bead of silicone caulking around the rim of the sink using the caulking gun.
9. Place the sink back into the hole in the granite and pull it up into place using a string wrapped through the drain.
10. Have another person underneath the countertop to tighten the machine screws into the granite and place the clips under the rim of the sink.
11. Place wood braces tight under the sink for support.
12. Run a finger along the rim of the sink to smooth out caulking and add more as needed.
13. Reconnect pipes and turn the water back on.
14. Wait 24 hours before removing the wood braces or using the sink.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Secure an Undermount Kitchen Sink | Ask This Old House
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Comment (0)

  1. All my build has plywood on top of the vanity then the sink then granite for framing purposes for the weight of the sink. Manufacturing of this sink countertop cheap out on their customers lol

  4. "Don't use the sink tonight, maybe take your wife out to dinner."? LOL. Maybe if she helped with this project. You should take that Richard Trethewey out to dinner, since he helped with this project.

  8. Should of been on the plywood instead all the weight on the screws. I build differently for my client. The sink will be on the plywood then screws just for it doesnt move around. Will never sag or comes loose unless the plywood gets rotted

  9. All the clip and nut installs come loose for undermount sinks over time. Even if the nuts hold in place the clips tend to bend from weight especially once the caulking fails. If you want to see the solution to this and to always allow for retrofit replacements of sinks take a look at the video at https://www.sinkcradle.com/about , this system has never failed and is far stronger and solves leak issues that the clips can't address

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