If you suddenly see a swarm of flies that means dozens of eggs have already hatched and developed into flies.
House fly infestation in attic.
If you have a large infestation in your attic then you probably need a large solution.
A house fly infestation can be annoying at best and dangerous at worst but with the correct sanitation prevention measures and right extermination methods the problem is easily fixable.
A few sticky traps or launching airborne pesticides may not be your preferred choice.
The most effective way to get rid of attic flies is to make sure that they stay outdoors.
Solutions include disposing of the attractants and using repellents to keep the flies away in the first place.
Rotting garbage and pet feces can attract flies and cause an infestation.
The one highlighted above is made for fast flying insects.
Unfortunately there is little that can be done for flies already inside the attic and walls.
Therefore fly paper fly strips and bug zappers are of no value.
The source is likely inside your house garage attic or garden.
They enter houses through cracks in the roof or in the walls cracks in door and window jambs and open doors and windows.
They do not fly around much in attics.
Another thing that can really help with a house fly infestation is to do some serious cleaning indoors and outdoors around your property.
You should probably look at your windows screens and even in your attic so that you can find any area that isn t sealed tight.
The most common reason for flies swarming all over your house is an infestation inside or nearby your home.