Des, I have a problem with wasps also and after research and asking questions I know what and when to look for. Always wait until it is sunny and warm to look for them. Go outside during a warm sunny day and watch for 10 minutes (dont get bit) you will see 1-2, ect go into a tiny crack somewhere on the outside of your house. They could be going into the siding from the bedroom window and flying up into the attic... Be a detective and figure out the point of entry. After you've done that you have many options. If they are multiplying in your attic..YOU GOT A BIG PROBLEM. (not sure if that can happen though) Good luck. I spray home depot (wasp killer spray)