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Install and Secure Top-Mount Sink — Remove the Old Sink

Beginner8 hours

Part of project

How to Install an Undermount Kitchen Sink · Step 2 of 10

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In this video

Carefully lower the prepared sink into the countertop opening, ensuring it is properly centered. Once the sink is in place, go underneath the counter. Use a screwdriver to tighten the screws on the top-mount clips. Work your way around the sink, tightening each clip a little at a time to ensure even pressure. Continue until the sink is pulled down securely and flush with the countertop. Do not over-tighten, as this can damage the clips, the sink, or the countertop.

Goal: Set the sink in place and secure it to the countertop.

  • Do not over-tighten the clips. Tighten them evenly until the sink is snug.

Used in this video

  • Screwdriver (Tool Type: Hand Tools, Screwdriver Type: Phillips head)Tightening the screws on the mounting clips.
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FAQs

What specialized tools are essential for installing an undermount sink that I might not already own?

You'll definitely need a basin wrench for reaching tight plumbing nuts, a quality caulk gun for sealant application, and sturdy bar clamps (like the BESSEY Clutch Style) to hold the sink firmly in place while the adhesive cures. These ensure a secure and watertight installation.

What are the most critical safety steps to take when removing the old sink and working with plumbing?

Always turn off the water supply to the sink completely before starting. Keep a bucket and towels handy for residual water, and if a garbage disposal is present, ensure its power is disconnected at the circuit breaker to prevent accidental activation and electrical hazards.

The project is rated 'beginner' with an 8-hour estimate; is this realistic for someone with limited DIY experience?

While rated beginner, 8 hours is an optimistic estimate for a first-timer. Plan for a full day or even two half-days to account for unexpected plumbing issues, meticulous dry-fitting, and allowing adequate adhesive curing time. Don't rush the sealing and clamping steps.

What common mistakes should I watch out for to ensure a leak-free and secure undermount sink installation?

The most common mistakes are insufficient adhesive/sealant, improper clamping leading to gaps, and not allowing enough curing time for the sealant. Ensure a continuous, thick bead of 100% silicone around the sink rim, use all recommended mounting clips, and keep the sink firmly clamped until the adhesive is fully cured.