No one wants to encounter a wasp (or worse yet, a wasp nest) in their home or yard. Chewed or damaged wood: Wasps chew on wood fence posts, trees, furniture and other wood surfaces. Wasps inside the home: Take note if wasps — dead or alive — are frequently found inside your house. It's always best to spray nests at sunset when wasps are less active, direct the spray toward the entrance first. However, if you do discover wasps inside your house, don't try to seal the nest inside the wall, thinking they'll just die off.