How to Caulk a Bathtub or Shower

Steps

1. 1

   Remove the old caulk

   Use a caulk removal tool or utility knife to cut and peel away all the old caulk. Get it fully out of the joint, not just the visible surface layer.

2. 2

   Clean and dry the joint

   Scrub away any mold or residue, then wipe the joint with rubbing alcohol and let it dry completely — caulk won't bond to a damp or dirty surface.

3. 3

   Tape both sides of the joint

   Apply painter's tape along both edges of the gap, leaving the joint itself exposed, for a clean, straight line.

4. 4

   Apply the caulk

   Cut the caulk tube tip at a 45-degree angle and run a steady, even bead along the joint in one continuous motion.

5. 5

   Smooth and remove the tape

   Smooth the bead with a wet finger or caulk tool, then remove the painter's tape immediately while the caulk is still wet.

6. 6

   Let it cure

   Avoid using the tub or shower for at least 24 hours (check your product's label) so the caulk fully cures before it gets wet.

When to call a pro

If you find soft or spongy drywall behind the tile, or the subfloor feels soft near the tub, that indicates water damage behind the caulk line — that's beyond a caulk refresh and needs a contractor to assess.

Frequently asked questions