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Fix silverfish in bathroom

We'll help you reduce humidity, remove food sources, seal cracks, and use traps—or when to call an exterminator.

Troubleshooting · Home care
30 min–1 hour setup, ongoing humidity control
What you'll need
  • Dehumidifier or exhaust fan
  • Sticky traps (glue boards)
  • Diatomaceous earth (optional)
  • Caulk
Step 1 of 5

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Steps

Goal: Reduce humidity, remove food sources, and trap silverfish.

  • Check if the bathroom is often damp. Run the exhaust fan. Fix leaks.
  • Good: Humidity is under control. Proceed to Humidity path or Trap path.
  • Bad: Still damp—reduce humidity first.

Humidity path

Goal: Keep humidity below 50%.

  • Run the exhaust fan during and after showers. Use a dehumidifier. Fix leaking faucets and pipes.
  • Good: Humidity is low. Proceed to Trap path.
  • Bad: Cannot reduce humidity—check for structural issues or call an exterminator.

Trap path

Goal: Trap silverfish and seal hiding places.

  • Place sticky traps in corners and under the sink. Apply diatomaceous earth along baseboards. Seal cracks. Store paper products in sealed containers.
  • Good: Silverfish numbers drop. Maintain humidity control.
  • Bad: Infestation persists—call an exterminator.

When to get help

Call an exterminator if:

  • The infestation is large or in many rooms.
  • It persists after reducing humidity and using traps.

Verification

  • Humidity is below 50%.
  • Cracks are sealed. Paper is stored in sealed containers.
  • Silverfish are gone or greatly reduced.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Reduce humidity Run exhaust fan; use dehumidifier; fix leaks.
  2. Remove food and seal Store paper in sealed containers; caulk cracks.
  3. Use traps Sticky traps and diatomaceous earth.
  4. Call exterminator Large infestation or persists after DIY.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Humidity level
  • Whether leaks were fixed
  • Steps already tried

Is the bathroom often damp or humid?

Silverfish need humidity to thrive.

Check humidity. Run exhaust fan. Fix leaks. Yes: reduce humidity first. No: proceed to traps and sealing.

Yes No

You can change your answer later.

Reduce humidity

Run fan, dehumidifier, fix leaks.

Run exhaust fan during and after showers. Use dehumidifier. Fix leaks. Keep humidity below 50%.

Yes No

You can change your answer later.

Use traps and seal cracks

Traps catch adults; sealing reduces hiding places.

Place sticky traps. Apply diatomaceous earth. Seal cracks. Store paper in sealed containers. Good: numbers drop. Bad: persists—call exterminator.

Yes No

You can change your answer later.

Silverfish reduced

Maintain low humidity. Keep traps in place. Monitor for return.

Done

Call an exterminator

Call an exterminator if humidity cannot be reduced or the infestation persists.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why are there silverfish in my bathroom?
Silverfish like humidity and darkness. Bathrooms provide both. They eat starch and cellulose—toilet paper, paper towels, glue in books. Reduce humidity and remove food sources.
How do I get rid of silverfish in the bathroom?
Run a dehumidifier or exhaust fan to keep humidity below 50%. Seal cracks. Store paper products in sealed containers. Use sticky traps or diatomaceous earth in corners.
Are silverfish harmful?
Silverfish do not bite or spread disease. They can damage paper, books, and fabrics. They are a nuisance. Reducing humidity and removing food sources usually controls them.

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