New York City’s pre-war brownstones, tenements, and apartment buildings were not designed with silverfish in mind — but silverfish love them anyway. Plaster walls, wood lath, aging plumbing, and steam-heat systems create exactly the kind of persistent humidity inside wall voids that silverfish need to survive and breed.
By the time you spot one in your bathroom or find the first jagged hole in a book page, there’s almost certainly an established population already living inside your walls. Silverfish are nocturnal, photophobic, and extraordinarily good at staying out of sight. They feed on the starch in book bindings, the paste behind wallpaper, and the cellulose in paper, photographs, and natural fiber fabrics.
The damage they cause is often irreversible. In a city where so many people live surrounded by personal libraries, original wallpaper, and decades of stored documents, the stakes are real.