Bees will seek out sheltered area to make a new hive. Once a hive has been established in a new place the bees will protect their home from intruders. The best defense against having a bee hive becoming established in the walls of your home is to properly seal every hole, crack and crevice with caulk. Repairing any damage to the exterior of your home immediately will also insure the structure remains bee free. Once a hive has been established in one of your walls it is necessary to kill the bees and seal the holes.
Drill with 1/4 inch bit
Disposable protective suit with hood
Drill a series of holes through the exterior of the infested wall. Leave 16 inches between each hole.
Spray a liberal amount of bee spray into each hole to kill the bees inside. Wait 12 hours for the bees to die or vacate the premises. If you can touch the wall and still feel or hear buzzing then keep spraying.
Fill each of the holes that you drilled with expansion foam to fill in the hollows of the wall and prevent re-infestation. Fill all of the other gaps around the exterior of your home with expansion foam as well to be sure you do not have to deal with this problem again.
Caulk can be used to cover the holes later to help them blend in to the wall. But, Expansion foam is needed initially to be sure the hollow spaces in the wall are completely filled.
Have an assistant stand by with a water hose equipped with a high powered spray nozzle so he can spray you in case of a swarm attack.
A disposable, hooded protective suit, work gloves, respirator, safety glasses, and face shield are absolutely necessary when dealing with bees.
Do not attempt to approach a bees nest if you are unsure of the species. Africanized honey bees will attack in huge swarms and pursue a victim for miles in an attempt to kill the intruder. This species should only be dealt with by a trained professional.
Do not attempt to kill or remove a hive if you are even slightly allergic to bee stings.