If the nest is a hanging nest make sure you purchase a spray with a projectile shot so that you can completely cover the nest with it.
Getting rid of wasps in attic.
You need to locate the nest first.
Another very common place to find wasps nesting is in attic spaces.
It is very easy for wasps to get into attics normally due to openings around vents and or poor construction practices that leave big gaps between the sections of wood near the areas where the shingles and gutters meet up.
The orkin pest specialist will inspect and develop a customized solution backed by science that best meets your needs.
If your wasps have built a nest on the floor of your attic bomb style wasp poisons work very well.
Because they are a dangerous pest i would recommend calling the local orkin branch office and asking them to send over a highly trained orkin pest specialist.
Locate the part of the attic where the hornets and wasps are coming and going.
Spray the nest according to the directions on your spray.
Leave the shop vac on for a few hours to catch as many of them as you can.
Getting rid of the nest is a bit difficult as compared to a single wasp but if you take the appropriate measures you will surely be successful.