We had Yellowjackets build a colony in our attached garage's wall. They made the initial entry at a cinderblock foundation/wood frame joint. They eventually made their way IN to the garage, after boring their way through a sheetrock joint. Joe showed up and hit both the entry and exit points with chemical spray. I managed to plug the interior access point after the hornets stopped entering the garage interior. The next day the hornets entering and exiting the outside access point was low enough for me to finally seal it off with expanding spray foam. Joe was professional and got the job done. No one got stung. We appreciate the help!