Aug 29, 2019 - 03:36 AM
#1 - Find and seal the holes that they are crawling through. Make sure that you seal them permanently with wood, cement, etc. Foam in a can and steel wood won't normally keep them out long.
#2 Trap them in the attic. Use a small 1 door trap such as the Havahart -https://www.epestcontrol.com/pest-products/394-Havahart-One-Door-Rabbit-and-Squ
irrel-Trap-1078.html Whole shell unsalted peanuts work well to trap them. Be sure to check the trap daily and reset or rebait as needed.
#3 Trap outdoors to reduce the population. A regular outdoor trapping program will reduce the numbers to a more manageable level and hopefully reduce the frequency that they will "chew" into your attic.
Don't be concerned about sealing them in your attic. They are not breeding this time of year (fall) so trapping young squirrels in the attic should not be an issue.
Hope this helps.