It is wise to prevent wasps from entering the house by sealing cracks, gable vents, and other points of entry, or openings, to attics where pests can enter. The average sized nest is about the size of a football, but can get many times larger. The hornets are fast fliers and can quickly swarm any potential threat. They are most aggressive when protecting the nest. Although frustrating, damage from wasps is usually cosmetic and limited to a small area. Major structural damage from wasps is rare. Small holes in wood studs and slightly larger holes in drywall are the most common types of damage. Such destruction can occur just about anywhere in the home -- wood floors, linoleum, carpet, ceilings, wood beams and any other surface that is not stone or ceramic.