If you have ever had raccoon problems they you will know just how hard it is to get rid of them. They are pesky little creatures, intelligent and nosy and will get into just about anywhere. The best way to get rid of raccoons is to either poison them or turn your house into a impenetrable
fortress from a raccoon perspective. Most municipalities will prevent you from poisoning raccoons and you also risk poisoning the neighbors cat or dog which will not make for great relations.
Placing heavy gauge wire mesh over all possible entrances will effectively deter the raccoons from entering your attic, however there are a few steps to take to make sure you do not make the problem worse. The wire mesh needs to be screw nailed into the roof and the joists. Use a sealant that will withstand the elements to avoid any water damage from water leaking inside from around the screws.
Use a one way trap door over the entrance to the den so the raccoons can leave but not return. This is an effective way to get rid of raccoons, however you want to make sure that any young they have can also get out as well on their own. The parents will take
your roof apart trying to get back in to their young if they are trapped inside.
Once you are sure they are out, remove the trap door and cover the entrance with wire gauge mesh after you have repaired the entrance to avoid any further damage from wind, rain or snow. Seal any other entrances or possible entrances in this manner as well. You will find in the long run that this is the best way to get rid of raccoons.