For the past month or so we've been finding a wasp here, a wasp there in the house. We couldn't figure out where they're coming in. I did a check about 5 days ago and saw a continuous stream coming and going from the corner of a basement window. It's in a recessed well, so I ducked down and looked up, and saw a crack in the window casing. It looked like JFK airport at a peak busy time. That evening, I sprayed wasp killer up into the crack, and went downstairs into the room, my server room, and sprayed up into the drop ceiling. I looked up and didn't see a nest, so I thought they were in the wall. I also fogged that room with wasp killer each evening as well, A few dozen dead ones have accumulated.
I also noticed in the room above the server room several dead wasps near the window. Anyway, I repeated the spraying at night and early morning and the flow of wasps fell to a small trickle. Today, my wife found 8 in the house. I went back downstairs - with hard-hat, goggles etc - and I noted several dead wasps over by the closet, and I removed the ceiling tile closest to it. There were at least 60 wasps on the tile, some moving.The nest that you see is about 15"x9". I just fogged the upstairs and downstairs rooms with wasp spray, and soaked the nest with wasp killer. I hear some angry buzzing coming out of it! I then fogged that room, closed the door, and put a towel under the door. In about an hour, I'll inject wasp-killing insecticide foam into the nest. This should take care of the bastards! The crack will be sealed tomorrow.
Did I mention that I'm allergic to wasp stings?