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Caulk and Test the Spout — Seal the Spout

Beginner3 hours

Part of project

How to Fix a Shower Diverter on a Tub Spout · Step 7 of 7

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For a finished look and to prevent water from getting behind the tub spout, apply a bead of caulk around the base where it meets the wall. Smooth the bead with your finger. Finally, test the repair by pulling up and pushing down on the diverter knob to ensure the spout is now solid and does not move.

Goal: General Adhesives and Sealants Projects Domain

  • Caulking is especially important on upper floors to prevent leaks to the floor below.
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Sam

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FAQs

Do I really need all the tools listed, like a torque wrench or patio furniture, for this project?

No, some listed tools are irrelevant for this specific project. You'll primarily need a utility knife or putty knife for caulk removal, a caulk gun for sealing, a rag/towel, and potentially an Allen wrench if your old spout has a set screw. Focus on plumbing-specific tools and materials.

What is the most important step to ensure a watertight seal for the new tub spout?

Thoroughly cleaning the pipe connection area is crucial. Remove all old caulk, debris, and corrosion before installing the new spout. After installation, apply a generous, continuous bead of silicone caulk around the base where the spout meets the wall to prevent water infiltration into the wall cavity.

How can I be sure to purchase the correct replacement tub spout?

First, determine if your existing spout is thread-on or slip-on by checking for threads inside the spout or a set screw underneath. Measure the pipe protrusion from the wall. Bringing your old spout or clear photos to the store will help ensure you get a new spout with the correct connection type and fit.

What should I do if water still drips from the tub spout when the shower is on after replacement?

If water still leaks, first re-examine your caulk seal for any gaps or imperfections. If the seal is good, ensure the new spout is fully engaged with the pipe connection; for threaded spouts, ensure plumber's tape was used and it's tightened properly. For slip-on spouts, verify the O-rings are seated correctly and the set screw is secure.