Eliminate sources of excessive moisture such as faulty plumbing and condensation. Silverfish love the humidty.
Using a dehumidifier will reduce the moisture content of the air that is essential to silverfish survival.
Other dehumidify methods include:
Ventilate closed rooms and attics
Eliminate standing water
Run an air conditioner
Regularly vacuum cracks and crevices around the home with a narrow tip.
Remove easily accessible food sources by storing pantry food in tight containers.

If you already have a silverfish problem inside your home, spray the home’s perimeter with a residual insecticide. Spraying the inside perimeter with a narrow band helps kill silverfish as they move throughout the structure. Spraying the outside foundation wall will keep a variety of bugs from entering the structure including silverfish. In addition, you can scatter an insecticide bait such as Intice Perimeter 10 in the attic.