Northern Prairie Wildlife Research Center
Batproofing of church steeples is difficult and dangerous because the inside of the steeple is often covered with numerous spikes from the roof covering. It is speculated that fiberglass batting over tarpaper could be secured on the inner surface of the steeple or tower to repel bats. The steeple louvers may be covered with 0.63-cm (1/4-in.) mesh hardware cloth from the inside and installed so as not to obstruct ventilation.