Bees In Attic What To Do. If the bees at any point do not tend the hive the honey will drip out and gravity dictates the rest. Trapping is another way to get bees out of the attic. If the breed you are trying to kill has a queen bee she will also die.
Aerosol bee and wasp spray can be applied to the nest to kill the bees. Make sure that you know the entering and exiting part of their beehives.
Any honey left inside the structure will attract more bees as well as a number of other things.
Borax is taken to the hive when the bees travel back and forth by attaching to them. Indeed even when a nest is damaged they will usually do their best to save the colony and rear the young. As the bees travel in and out of the nests they will carry the insecticide powder you sprayed at the entry point to other bees in the nest. If the plumbing is near to the nest rather than likely to damage it you can safely leave the nest in place.