09/02/2026
A lot of homeowners assume squirrels are a summer problem — they're loud, they're active, they're easy to see. But fall is when squirrels become a structural problem.
Squirrels don't hibernate. They spend fall in a food-caching and shelter-seeking mode that makes them one of the most persistent attic invaders Mid-Michigan sees each year. They're looking for a warm, dry, protected space to get through winter — and the gap in your soffit, the rotted fascia board, or the loose roof vent cover they've been testing all summer is the door they've been waiting to push through.
Once inside, squirrels cause problems quickly:
Chewing through roof decking and structural wood — squirrels gnaw constantly. Rafters, roof deck OSB, and framing lumber are all targets.
Destroying attic insulation — they compress and shred blown-in and batt insulation for nesting material. This creates cold spots and contamination that requires remediation.
Compromising wiring — electrical wiring in attic spaces is a documented squirrel gnaw target. This creates fire risk.
Bringing in exterior debris — acorns, bark, and nesting material create long-term moisture and pest harborage issues.
The time to address a squirrel issue is before they're inside for winter. Once they've been in the attic for a full season, the damage assessment changes significantly.
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