One big mistake people make when attempting a DIY wasp treatment is to seal up the entry point to the nest. This is usually done with expanding foam, concrete or some other building material. Sealing the entry point can actually create more issues than you previously had.
The wasps will try everything they can to get to their queen, which will likely result in them creating a secondary entry point to the nest. A second opening can cause more damage to the home, as well as create another point that needs treatment.
In addition, the wasps that are sealed inside the home will ultimately try to find a way out, taking the path of least resistance to get there. This often leads to wasps appearing inside the home, usually entering through vents or light fixtures.
Trapping aggressive wasps inside your structure increases the risk of indoor infestations, accidental stings, and hidden damages.