Flies In Attic Room

Bug bombs that release poison throughout a room can be used to kill the flies in an attic or crawlspace.
Flies in attic room. Apply insecticide to the outside of your attic to prevent flies from coming in. These are not the same as the blue bottles that buzz hard against the windows in the warmer weather or the house flies and smaller flies that are active in summer too. Unlike more familiar blow flies such as the bluebottle genus phormia they do not present a health hazard because they do not lay eggs in human food. Remember attic flies want to cluster indoors when it starts to get a lot cooler outdoors.
Cluster or attic flies are the genus pollenia in the blowfly family calliphoridae. Cluster fly larvae develop inside earthworms living in the ground outside of homes. Individual flies found around the house can be sprayed with household insecticides. Do this in the summer or early fall at the latest.
Spray as best you can around your roof chimney eves ventilation holes etc.