What Material Should I Use to Exclude Bats?

People often confuse the behavior of rodents and bats. While rodents like rats, mice, and squirrels will chew on wood and other building materials, bats won’t. Although bats might try to scratch, the marks they leave are minimal. But that doesn’t stop them from getting into homes, attics, chimneys, and walls. Some bat species are so small that they can squeeze themselves through holes smaller than half of an inch. For homeowners, their presence causes disturbances and they also pose a health risk. Little wonder many people want them out promptly. When it comes to excluding bats, there are different materials and methods, ranging from stainless steel wool to weather-stripping and more. This post explores some common materials used to exclude bats.

bat screen exclusion

Bat exclusion is carried out for two main reasons. One, to prevent bats from gaining access to your home. Second, to ensure that bats that have roosted in your home (attic, chimney, or wall) are unable to get back in once they go outside. Bats take advantage of tiny cracks and holes to gain access to a home. For instance, during the alternate heating and cooling of wood, it expands and contracts. As a result, cracks begin to appear, and with time, they expand. Caulking involves sealing all of the potential entry holes. Common materials used for caulking include cotton, rubber, glass fiber, sponge, and putty. Latex can also be used for a semi long-term solution. For indefinite durability, silicon and poly-sulfide based rubbers can be used.

Exclusion Devices
When installed, exclusion devices allow bats to exit your home through them, but they are unable to get back in through the device. This forces them to look for another place to reside. Before installing a one-way exclusion device, all potential entry holes have to be identified and sealed, except one. In the last hole, the exclusion device is then installed. After you’ve made certain that all the bats have left your home, then the exclusion device can be removed and the final hole sealed.

bat screen exclusion construction

In the areas where the walls meet the chimney, tiny holes usually exist that can serve as potential entry holes for bats. Flashing is the usage of metals to cover such holes and cracks. Some of the common types of metals used include aluminum, stainless steel, and copper. They are commonly used because of their ability to withstand harsh weather. Flashing your home will help to keep bats away.
Weather Stripping
Another entry hole commonly used by bats is the space that exists between the base of the door and the floor. By installing weather strips on your doors, you’re effectively blocking these potential entry holes. The most common materials used for weather-stripping include hard rubber, aluminum, nylon, felt, natural fiber, and more. Asides from keeping bats and insects away, it also provides the added advantage of minimizing heat loss.


Several options, methods, and materials are employed for bat exclusion. However, if you have a bat infestation problem, it’s best you bring in wildlife removal professionals so they can effectively deal with the problem.