Straight answers from a licensed New York exterminator and Associate Certified Entomologist (ACE) — serving all five boroughs, in English and Spanish.
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If silverfish keep reappearing in your bathroom, closets, or bookshelves — and you have books, art on paper, or fine wallpaper to protect — you have a humidity problem as much as a pest problem. Guidance from an Associate Certified Entomologist.
Why silverfish are chronic in older NYC homes
Silverfish thrive in exactly the conditions found in pre-war apartments and brownstones: humid bathrooms, damp basements and storage, and quiet closets near old plaster and paper. They are nocturnal, hide well, and can live for several years, so a population builds quietly and reappears the moment conditions favor it. In homes with libraries, framed works on paper, and fine wallpaper, that persistence turns into real damage.
Why they’re a costly problem for collectors
Silverfish graze on cellulose and starch — the paper and bindings of books, documents and photographs, wallpaper and its paste, and the sizing on silk and other fabrics. They leave irregular etched surfaces and small holes. For a rare-book collection, archival documents, or expensive wallpaper, unmanaged silverfish are not a nuisance — they’re a slow, expensive loss.
The real reason your treatments keep failing
- You’re treating symptoms, not moisture. Until humidity in the affected areas is reduced, the harborage keeps producing silverfish.
- They hide and live for years. A surface spray misses the breeding sites in wall voids, under baseboards, and in damp storage.
- Vulnerable items stay exposed. Books and paper left in a humid room remain both a food source and a loss waiting to happen.
— Jorge Bedoya, Associate Certified Entomologist (ACE)
How we resolve chronic silverfish
- ACE inspection to find the damp harborage driving the problem — not just the rooms where you see them.
- Moisture and harborage correction plus targeted treatment of the breeding sites.
- Collection protection guidance — how to store and monitor books, documents, and art on paper in a dry, safe space.
See our general pest control program for ongoing protection of a home with a library and fine finishes.
What to expect
We inspect, identify the moisture source, treat the harborage, and advise on protecting your books, paper, and wallpaper — then explain what was driving the problem. We serve Manhattan and Brooklyn brownstones and collectors in English, Spanish, and Chinese.
A Brooklyn-based, NYSDEC-registered company (Reg. #15140) led by Jorge Bedoya, an Associate Certified Entomologist (ACE). For pests in your home or building, NYE provides IPM-based, low-exposure control matched to the exact pest and verified with a follow-up. ACE-led work comes with a client portal of service reports and photos, fully bilingual service, and no long-term contract.
Silverfish FAQ
Why do silverfish keep coming back no matter what I do?
Because silverfish are a humidity problem as much as a pest problem. They breed in damp, hidden spaces such as bathrooms, basements, closets, and behind walls, and live for years. Until the moisture and the harborage are addressed, spraying the ones you see never ends the cycle.
What do silverfish damage in the home?
Silverfish feed on starches and cellulose: books and paper, documents, wallpaper and its paste, photographs, and even the sizing on silk and other fabrics. In homes with rare books, art on paper, or fine wallpaper, they can cause real and costly damage.
Are silverfish a sign of a bigger problem?
Often they point to excess humidity or a hidden moisture issue, which can matter beyond the silverfish themselves. Persistent silverfish are worth an inspection because the underlying dampness may also invite other pests or affect the building.
How do you get rid of silverfish for good?
By reducing humidity in the affected areas, treating the harborage where they breed, and protecting vulnerable items. Because they live for years and hide well, durable control combines moisture correction with targeted treatment, not a one-time spray.
Do silverfish harm books and important documents?
Yes. They graze on the surface of paper and bindings, leaving irregular etched areas and small holes, and they are drawn to the starches in book bindings and wallpaper paste. Collectors should protect valuable volumes and store them in a dry, monitored space.
Why collectors and brownstone owners choose NYE
New York Exterminating is led by Jorge Bedoya, an Associate Certified Entomologist (ACE) — who treats silverfish as the moisture-and-harborage problem they are, and helps you protect a collection in the process. We keep our callback rate under 1%. Call (347) 210-4646 for a silverfish inspection.
