Bats do not and cannot chew through screen, wood, walls, or other building materials. However, it is quite common for people to make this misconception. Ironically enough, screen and/or mesh are often recommended for deterring bats from buildings and/or homes and can be put up anytime other than a bat’s maternity season to keep bats away.
A bat’s maternity season is June through August. These months should be avoided for blocking off bats as baby bats are born unable to fly and if trapped inside could starve to death.
Rodents are more likely to chew through building materials and bats are often blamed for a mouse chewing through screens or building materials if the two are residing in the same area at the same time. Bats are more likely to sneak into a person’s walls or attic by squeezing through a tiny crack or crevice.