The worst thing you can do is to try to block the entrance into the attic or poison them or trap them. Blocking the entrance could mean you are trapping babies inside or an adult parent inside. The parent will try to rescue the babies and even tear another hole in your roof or siding to rescue them.
Poisoning them could mean that one dies inside your home and really cause a mess and a bad smell as the body gradually disintegrates. Trapping raccoons works but then you have an angry snarling dangerous raccoon inside a trap. You might be lucky and trap one, but they are smart and you will never trap another.
Once the raccoons are gone, other raccoons in the area can smell a vacant den (your house’s attic) and they will come visiting even if you block the old entrance up. Unless you take special precautions, another family is just going to move in.
The best approach by far is to install heavy gauge wire mesh over all possible entrances. Next install a one-way trap door over the entrance they have been using. This way they can get our but not back in. Make sure the babies are out or at least old enough to travel on their own. After they are all out, remove the trap door and install the wire mesh over the entrance. Seal it so that snow and rain cannot enter.
You may have raccoons visiting your home, getting up on the roof. If you have sealed and covered all of the potential entrances with heavy gauge wire mesh properly, no more raccoons will be able to get into your home.
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