Though not the best of situations be thankful this is happening into the attic and not the main living spaces.
Carpenter bee in attic.
Finding carpenter bees in bathroom in most cases one of the situations described above is what causes some to end up inside the home for sure.
Carpenter bees in the attic.
Carpenter bees are pollinating insects so you may want to learn how to get rid of carpenter bees naturally.
You may also be dealing with carpenter bees which can do significant damage to wood.
A heavy colony will usually drop from the underside of a roof at about 130 degrees.
There are several non lethal means of getting rid of them.
Carpenter bee traps are convenient to use and offer a non toxic method of elimination.
Buy or build a trap and hang it directly above the bee hole.