A gap that looks too small to worry about is exactly the kind of opening a squirrel will use — and if it isn't quite big enough on the first try, a squirrel's front teeth are more than capable of making it bigger. Understanding where these gaps typically form is the fastest way to catch one before it turns into an active attic problem.
The Roofline Spots Squirrels Target
Squirrels consistently target the same handful of weak points: the seam where fascia boards meet the roof deck, corners where soffit panels have started to sag or separate, and gaps hidden behind gutters where wood is more likely to have taken on moisture. These spots share one thing in common — they're usually already slightly compromised by age or moisture before a squirrel ever finds them, which makes the wood easier to widen.
A squirrel can fit through an opening as small as roughly one to one and a half inches across. If a gap looks smaller than that, don't assume it's safe — a determined squirrel will gnaw softened wood wider over several nights until it fits.
How To Tell A Gap Was Widened On Purpose
Weathered wood that's simply rotted looks gray, soft, and uniformly worn. A gnawed opening looks different: the edges show fresh, lighter-colored splinters and clear tooth marks, often in a slightly oval shape rather than a ragged hole. Finding that kind of fresh damage, especially paired with staining or smudge marks from oil in a squirrel's fur around the opening, is a strong sign of current, active use rather than old damage.
Why Sealing First Is The Wrong Order
The instinct to grab caulk or a scrap of wood and close the gap immediately is understandable, but doing that before confirming the attic is empty risks sealing a squirrel — or a whole litter — inside. That turns a straightforward repair into a much bigger problem involving odor, additional chewing to try to get back out, and potential damage well beyond the original hole. Confirming the attic is clear always comes before permanent repair work.
Once the space is confirmed empty, our squirrel removal team can move directly into exclusion, closing the gap with squirrel-resistant materials rather than anything that can simply be chewed through again.
A roofline gap doesn't stay the same size forever if a squirrel has decided it's worth the effort. Catching the early signs — fresh splintering, oily staining, a slightly-too-small hole — is what keeps a minor repair from turning into a full attic infestation.