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

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.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse 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. Looking for more step by step guidance on how to complete projects around the house? Join This Old House INSIDER to stream over 1,000 episodes commercial-free: https://bit.ly/2GPiYbH Plus, download our FREE app for full-episode streaming to your connected TV, phone or tablet: https://bit.ly/34RYEP5 Follow This Old House and Ask This Old House: Facebook: http://bit.ly/ThisOldHouseFB Twitter: http://bit.ly/ThisOldHouseTwitter http://bit.ly/AskTOHTwitter Pinterest: http://bit.ly/ThisOldHousePinterest Instagram: http://bit.ly/ThisOldHouseIG http://bit.ly/AskTOHIG For more on This Old House and Ask This Old House, visit us at: http://bit.ly/ThisOldHouseWebsite How to Secure an Undermount Kitchen Sink | Ask This Old House    / thisoldhouse