honeycomb sandwich construction?

just tell them to buzz off!!

Actually they are unlikely to stay there, it is a crap hive spot. They are probably just swarming before flying off to find a permanent spot. Just leave them for a day to two and they will probably go.
If still there after 48 hours, then dress appropriately and break out the Mortien.
One trick I used to do with wasp nests is get a big tin of Aeroguard and a long handled lighter. Get that flame thrower thing happening and it instantly burns off all thier wings so they can't chase you. Then get the bug spray onto them at your leisure.