Final Tightening and Cleanup — Secure the Sink with Mounting Clips
Part of project
How to Install an Undermount Kitchen Sink · Step 6 of 10
In this video
Once the snap ring is securely in place, use a flathead screwdriver or a drill to tighten the three screws on the mounting ring evenly. As you tighten the screws, the assembly will pull up against the sink, squeezing out excess plumber's putty from around the flange in the sink basin. Continue tightening until the flange is snug and sealed. Finally, use your finger or a putty knife to remove and discard the excess putty from the sink.
Goal: Secure the flange and clean up
- Tighten the screws in an alternating pattern, like you would lug nuts on a car tire, to ensure even pressure.
Used in this video
- Screwdriver (Screwdriver_Type: Flathead) — Tightening the mounting screws.
- Drill (Drill_Type: Cordless) · optional — Quickly tightening the mounting screws.
- Rag · optional — Cleaning up excess plumber's putty.
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FAQs
Is installing an undermount kitchen sink truly an intermediate DIY project for a novice, given the 8-hour estimate?
While listed as 'intermediate' with an 8-hour estimate, the project involves critical plumbing connections, working in tight spaces, and precise sealant application, which can be challenging for beginners. If you're not confident with plumbing or power tools like a drill, consider hiring a professional for specific steps or the entire installation to avoid potential issues like leaks.
What are the most crucial specialized tools I'll need for this undermount sink installation, beyond basic household items?
Key specialized tools include adjustable and tongue and groove pliers (like the Channellock 430) for securing plumbing connections, and a reliable drill for installing the mounting clip anchors. A putty knife is essential for working with plumber's putty, and a good flashlight (like the NITECORE P20iX) will be invaluable for inspecting connections in dimly lit cabinet spaces.
What are the most common reasons for leaks after an undermount sink installation, and how can I prevent them?
Leaks typically occur due to insufficient sealant around the sink's rim, improperly tightened drain or water supply connections, or issues with the garbage disposal seal. Ensure a continuous, even bead of sealant when mounting the sink, hand-tighten plumbing connections first then give a quarter to half-turn with a wrench, and double-check all gaskets during assembly.
The project mentions Oatey Plumber's Putty; can I use 100% silicone sealant instead for mounting the sink to the countertop?
Yes, 100% silicone sealant is often preferred for undermount sinks, especially with stone countertops, as it creates a stronger, more permanent, and flexible waterproof bond than plumber's putty. While plumber's putty is excellent for sealing drains and strainers like the KRAUS Kitchen Sink Strainer, silicone offers enhanced long-term durability for the sink-to-countertop seal.
Final Tightening and Cleanup — Secure the Sink with Mounting Clips
Part of project
How to Install an Undermount Kitchen Sink · Step 6 of 10
In this video
Once the snap ring is securely in place, use a flathead screwdriver or a drill to tighten the three screws on the mounting ring evenly. As you tighten the screws, the assembly will pull up against the sink, squeezing out excess plumber's putty from around the flange in the sink basin. Continue tightening until the flange is snug and sealed. Finally, use your finger or a putty knife to remove and discard the excess putty from the sink.
Goal: Secure the flange and clean up
- Tighten the screws in an alternating pattern, like you would lug nuts on a car tire, to ensure even pressure.
Used in this video
- Screwdriver (Screwdriver_Type: Flathead) — Tightening the mounting screws.
- Drill (Drill_Type: Cordless) · optional — Quickly tightening the mounting screws.
- Rag · optional — Cleaning up excess plumber's putty.
Frequently Asked Questions
Is installing an undermount kitchen sink truly an intermediate DIY project for a novice, given the 8-hour estimate?
While listed as 'intermediate' with an 8-hour estimate, the project involves critical plumbing connections, working in tight spaces, and precise sealant application, which can be challenging for beginners. If you're not confident with plumbing or power tools like a drill, consider hiring a professional for specific steps or the entire installation to avoid potential issues like leaks.
What are the most crucial specialized tools I'll need for this undermount sink installation, beyond basic household items?
Key specialized tools include adjustable and tongue and groove pliers (like the Channellock 430) for securing plumbing connections, and a reliable drill for installing the mounting clip anchors. A putty knife is essential for working with plumber's putty, and a good flashlight (like the NITECORE P20iX) will be invaluable for inspecting connections in dimly lit cabinet spaces.
What are the most common reasons for leaks after an undermount sink installation, and how can I prevent them?
Leaks typically occur due to insufficient sealant around the sink's rim, improperly tightened drain or water supply connections, or issues with the garbage disposal seal. Ensure a continuous, even bead of sealant when mounting the sink, hand-tighten plumbing connections first then give a quarter to half-turn with a wrench, and double-check all gaskets during assembly.
The project mentions Oatey Plumber's Putty; can I use 100% silicone sealant instead for mounting the sink to the countertop?
Yes, 100% silicone sealant is often preferred for undermount sinks, especially with stone countertops, as it creates a stronger, more permanent, and flexible waterproof bond than plumber's putty. While plumber's putty is excellent for sealing drains and strainers like the KRAUS Kitchen Sink Strainer, silicone offers enhanced long-term durability for the sink-to-countertop seal.