Squirrels get into attics by chewing through weak points on your roof and exterior walls, particularly soffit panels, fascia boards, and areas where different building materials meet. They only need a small opening to start, and their constantly growing teeth let them widen a gap in wood, vinyl, or even shingles until it’s large enough to squeeze through. Once inside, they’ll nest, chew wiring, and cause damage that compounds quickly.
The Entry Points Squirrels Target
Squirrels rarely break through solid, well-maintained roofing. Instead, they exploit spots where materials are aging, joined imperfectly, or designed to ventilate. The most common entry points include soffit panels (the underside of your roof overhang), fascia boards (the trim running along the roofline), roof vents, chimney flashing, gutter gaps, and the intersections where a roof meets a wall. Deteriorated sealant joints are another frequent weak spot.
Roof-to-wall intersections deserve special attention because they’re easy to overlook. These are the seams where a lower roof section meets a vertical wall, and builders often seal them with flashing and caulk that degrades over time. A squirrel finding even a small gap there can chew its way into the attic cavity in minutes. Soffit panels are similarly vulnerable because they’re often made of thin vinyl or aluminum that warps with age, creating gaps a squirrel can pry open.
Tree branches act as highways to your roof. A branch hanging within 6 to 8 feet of your roofline gives a squirrel an easy launch point. From there, they’ll explore every seam and edge until they find soft or damaged material to chew through.
Why Squirrels Want Your Attic
Attics offer stable temperatures and protection from predators and weather, which is exactly what a pregnant squirrel needs. Spring is one of the most active times for attic intrusions because female squirrels enter their first breeding season of the year and actively seek secure nesting sites to raise young. A second wave typically hits in late summer or early fall before the second litter arrives.
Your attic mimics the inside of a large tree cavity: dark, enclosed, warm in winter, and sheltered from rain. But it’s often better than a tree because insulation provides soft nesting material, and the structure blocks wind more effectively. Once a squirrel discovers the space, she’ll return to it season after season unless the entry is permanently sealed.
How to Tell It’s Squirrels, Not Rats
The biggest clue is timing. Squirrels are active during the day. If you hear scurrying, scratching, or thumping in your attic during early morning or early evening hours, that’s consistent with squirrels leaving and returning. Rats, by contrast, are nocturnal, so noises at 2 a.m. point toward rodents instead.
Droppings from both animals look similar: dark brown to black with blunted ends. But squirrel droppings tend to be found in attic spaces or near tree trunks outside, while rat droppings appear along walls, in cabinets, and near food sources at ground level. The chewing patterns also differ. Squirrels do most of their structural damage on the exterior, gnawing through roof shingles, siding, and trim to create entry points. Rats tend to chew their way in from ground level or through interior walls.
Once inside, both animals chew on electrical wires, PVC pipes, and wood. This commonly leads to leaks, power outages, and even fire risk from exposed wiring. If you’re hearing daytime noise and finding chew marks on your roofline, squirrels are the likely culprit.
How to Get Squirrels Out Safely
The single most important rule: never seal the entry point while squirrels are still inside. A trapped squirrel will panic and cause far more damage than it would have otherwise, chewing through drywall, wiring, and plumbing in desperation. If it dies inside the attic, the smell can last weeks and the carcass can be difficult or impossible to retrieve.
This matters even more during nesting season. Traps and one-way doors are effective at removing the mother, but baby squirrels in the nest can’t leave on their own. If the mother is locked out while her litter is still inside, you’ll end up with dead babies decomposing in your insulation. Before any exclusion work begins in spring or late summer, you need to confirm whether a litter is present.
Wildlife professionals often use an “eviction treatment” to convince the mother to relocate her babies voluntarily. This involves a combination of flashing lights, predator scent, and other deterrents placed near the nest. When it works, the mother carries each baby to an alternate nest site on her own. After the family appears to have left, a one-way excluder device is installed over the entry point. This is typically a cage-like tube with doors that swing outward only, allowing any remaining squirrel to exit but not return.
One-way doors have practical advantages over live trapping. They require fewer service visits (one to install, one to remove), they’re less stressful for the animal, and the squirrel stays in its home territory. Relocating squirrels to a new area often results in their death because they don’t know where to find food or shelter.
Sealing Your Attic Permanently
Once every squirrel is confirmed out, the entry point and any other vulnerable spots need to be sealed with materials squirrels can’t chew through. Half-inch hardware cloth (wire mesh) is the standard for squirrel exclusion. It’s strong enough to resist their teeth while still allowing airflow through vents. Quarter-inch mesh stops mice and snakes but is overkill for squirrels alone; three-quarter-inch or larger mesh won’t stop them.
Cover roof vents, soffit gaps, and any openings along the fascia with this mesh, secured with screws rather than staples. For chimney flashing gaps and roof-to-wall intersections, sheet metal or metal flashing works well. Avoid relying on spray foam, caulk, or plastic covers alone. Squirrels chew through all of these with little effort.
Trim tree branches so nothing hangs within 8 to 10 feet of your roof. Squirrels can jump surprisingly far, and even a branch that looks too distant can serve as a launching pad. Inspect your roofline at least twice a year, ideally before the spring and fall nesting seasons, looking for new gaps, warped soffit panels, or gnaw marks that signal a squirrel has been testing the perimeter.
Damage to Watch For
Squirrels gnaw constantly to keep their teeth from overgrowing, and your attic gives them plenty of targets. Chewed electrical wiring is the most dangerous outcome because exposed wires in contact with insulation create a fire hazard. Gnawed PVC pipes can cause slow leaks that go unnoticed until water damage spreads through ceilings or walls.
Insulation damage is nearly universal. Squirrels tunnel through fiberglass batts and compress blown-in insulation to build nests, reducing its effectiveness. Contamination from urine and droppings can also degrade insulation over time and introduce odors that linger even after the squirrels are gone. If a squirrel colony has been active in your attic for more than one season, an inspection of wiring, plumbing, and insulation condition is worth the investment.