A brown or grey stain where bats are entering and exiting the roost. The stain is caused by a gland on the underside of the bats body that keeps it's fur oiled. This is the area were exclusion nets are placed. Stains are oil based and can be difficult to remove. Bleach products and grease removers work well on the stains.
Bat droppings also known as guano, underneath the roost site. Bats have a tendency to clean house by pushing the droppings out of the main entrance to keep a clear exit - entry path to the roost. The droppings are pellet like in appearance. Droppings may also stick to walls and windows. With time, the droppings will turn to dust and flush away with a good rain shower or strong winds.
A pungent musk like urine smell. This odor is actually from the bats themselves and not the bat droppings. Most of the smell will dissipate once the bats are gone. In some cases if the smell persists after the bats have gone, then, the insulation in the attic should be replaced to further eliminate any lingering odor.
Bats have a social roost chatter that sounds much like baby birds chirping. This chatter is audible to the human ear and is used mainly for communication among each other within the colony. It is also used to communicate warning to let other bats know of impending danger. This communicating is most noticeable in the evening prior to an emergence or early in the morning before sunrise, when bats are returning to the roost.
Look for bats leaving the roost in the evening just around sunset or returning to the roost just before sunrise. Estimate about double the amount of bats if you count them. Not all of them will leave the roost every night. Weather may also play a factor on the size and the time of an emergence.
If you have 3 or more of these signs, chances are, you have a bat problem. Contact us for a free inspection.