Silverfish in the Bathroom: Start With Moisture

Start with what you know

Silverfish prefer humid, sheltered places. Reducing moisture often matters as much as treating the insects you can see.

Why this problem happens

Bathrooms provide condensation, paper products, adhesives and small gaps around services. Repeated sightings can point to poor ventilation, a slow leak or a damp void.

What you can do now

1. Run the extractor during bathing and allow the room to dry afterwards.
2. Check seals, pipe joints and the area beneath the bath for moisture.
3. Remove damp cardboard and store paper products away from the floor.
4. Use monitors to learn where activity is strongest.

What not to do

Do not cover suspected damp with sealant or paint before finding the source. Surface treatment alone will not correct a leak or persistently high humidity.

When to call a professional

Arrange an inspection if silverfish appear daily, spread beyond one room or accompany staining, damaged paper or a persistent damp smell.

A useful visit should end with a clear explanation of what was found, what was treated, any limits on access, and the next review point. Ask for the total scope and price before authorising work.