There are several non lethal means of getting rid of them.
Carpenter bee in attic.
Though not the best of situations be thankful this is happening into the attic and not the main living spaces.
Carpenter bees are pollinating insects so you may want to learn how to get rid of carpenter bees naturally.
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.
A heavy colony will usually drop from the underside of a roof at about 130 degrees.
Carpenter bees xylocopa violacea pose a real threat to any wooden structure or surface including your attic while they typically don t sting humans these monstrous bees are known for boring long complex tunnels in wood.
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.
Here females lay their eggs while males burrow until spring.