After golf size hail I went up on the roof with a roof guy. And had to retreat because of the hoard of wasps at my chimney. Have a gas fireplace insert in an old brick fireplace with an intake and exhaust pipe run up the old chimney. They got under the steel cap and must have a big nest in there. Turned on the fireplace to try and "cook" them. Did smell bad first 20 minutes or so. And the next day they are still there. More "cook" time and a little spraying from the top of the ladder. Will have to check again. Might have to have it inspected to make sure the nest was along the sides in the old chimney and not inside the insert pipes.
Damn things are in my bath exhaust vent, attic louvers and even started to build in the ladder rungs of the ladder I left up for a couple of day.