Both species are found in warm, concealed spaces inside buildings. Silverfish can be anywhere in the house whereas Firebrats mainly stay in heating systems near electrical baseboards and heat vents. Relatively high humidity levels will spur the development of these pests, which can survive up to 300 days without food. Silverfish and Firebrats prefer to feed off vegetable matter, particularly substances containing flour and starch. They can damage glossy paper, wallpaper, book bindings, synthetic materials, as well as cotton, heavy fabric, and rayon. They also eat the glue used in lumber mills, and can even digest cellulose. They are sometimes found on construction sites, because they get into pressboard at the time of shipping.