How to Know When It’s Time to Replace Bathroom Caulk

All Seasons Handyman · Huntsville, Alabama

Caulk may seem like a small detail, but it plays a big role in protecting your bathroom from water damage. Over time, caulk breaks down — and if it’s not replaced, moisture can seep behind walls, tile, tubs, and flooring.

1. Cracking or Peeling Caulk

If caulk is cracked, peeling, or pulling away from the surface, it’s no longer sealing properly. Water can easily sneak behind it and cause hidden damage.

2. Stains, Mold, or Dark Spots

Dark discoloration around tubs or showers often means mold is forming under the caulk. This is a sure sign it’s time to replace it.

3. Soft or Spongy Areas Around the Tub

If the floor or wall near your tub feels soft, moisture has already seeped behind the surface. New caulk — and sometimes additional repair — is needed.

4. Caulk Is More Than 5 Years Old

Even high-quality caulk doesn’t last forever. Most bathrooms need fresh caulk every 3–5 years.

5. Gaps or Openings in Corners

As homes shift slightly over time, the corners of tubs and showers may pull apart. Corner gaps must be re-caulked to prevent leaks.

6. Persistent Musty Smell

If your bathroom smells musty even after cleaning, moisture may be trapped under failing caulk.

7. Water Outside the Shower or Tub

Water pooling on the floor after showers is a major warning sign that your caulk isn’t sealing properly anymore.

Replacing caulk is a simple, inexpensive fix — but it prevents thousands of dollars in moisture damage down the line.

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