Squirrels running across your roof are more than a nuisance. They’re actively looking for a way inside, and they only need a gap of 1.5 inches to squeeze through. If you’re hearing persistent scampering, scratching, or thumping overhead, there’s a good chance squirrels have already found an entry point or are working on creating one.
How to Tell If Squirrels Are Getting Inside
The first clue is timing. Squirrels are active during the day, so scratching and scampering sounds in your attic or ceiling during daylight hours point strongly to squirrels rather than rats or raccoons, which are nocturnal. You may also hear chewing noises, since squirrels have incisors that never stop growing and need to gnaw constantly on wood, insulation, and other materials. Thumping or rolling sounds often mean they’re dropping nuts or leaping between beams.
Outside, look for jagged, chewed openings around your roofline. Squirrels gnaw their way through wood to widen small gaps into usable entry holes, and these openings tend to have rough, uneven edges that look distinctly different from weather damage or rot. You might also notice droppings in your attic (smaller than rat droppings, pellet-shaped), nesting material like shredded insulation or leaves, or staining around entry points from the oils in their fur.
Where Squirrels Get In
Squirrels target the weakest spots along your roofline. The most common entry points are fascia boards, soffits, soffit vents, ridge vents, and gable vents. The eaves, where the roof extends past the exterior wall, are particularly vulnerable because they contain multiple access points in a small area. The “roof return,” where the wall meets the roof underneath the eaves, is one of the easiest places for a squirrel to breach.
Fascia boards run along the lower outer edge of the roof, and in some regions, homes have small construction gaps above the fascia for ventilation. Squirrels use gutters to reach these gaps and squeeze into the attic. They’ll also chew directly through soffits, the panels on the underside of the eave overhang, to create entry holes. Overhanging tree branches give squirrels a direct highway to your roof. If a branch comes within six to eight feet of your house, a squirrel can easily jump the distance.
The Real Damage They Cause
Squirrels on your roof are a structural and safety problem. Their constant gnawing damages wood beams, fascia boards, and roof decking, which can lead to water intrusion over time as protective layers are compromised. They tear apart insulation for nesting material, reducing your home’s energy efficiency and creating a mess that’s expensive to replace.
The most serious risk is electrical. Squirrels chew through wiring, stripping insulation off electrical lines and creating exposed connections. When chewed wires sit near gas lines, which often run through the same areas of an attic, the combination of electrical sparks and potential gas leaks becomes a genuine fire hazard. They’ve also been known to disable alarm systems by chewing through the wires that connect them, meaning a fire could go undetected longer. Damaged wiring is one of the top reasons wildlife professionals urge homeowners to take squirrel intrusions seriously rather than waiting for the animals to leave on their own.
Why Timing Matters: Baby Season
Squirrels have two breeding seasons per year. The first runs through winter, with litters born in late February and March. The second breeding period falls in summer, from June through August, with litters arriving in late summer. Gestation lasts between 28 and 45 days depending on the species.
This matters because baby squirrels are completely dependent on their mother for at least six weeks, and some species nurse for up to twelve weeks before leaving the nest. If you seal up entry points while babies are inside, the mother will cause significant damage trying to get back in, and the babies will die in your attic, creating odor and sanitation problems. It’s during these birthing seasons that squirrels most aggressively seek out attics, chimneys, and wall cavities for the warmth and protection they provide.
How to Get Squirrels Out
The most effective method is a one-way exclusion device. This is a cage-like apparatus with doors that swing in only one direction, allowing squirrels to leave but not return. The device gets mounted over the primary entrance hole, and every other entry point on the house is sealed before or during the process. This is a critical detail: squirrels maintain multiple entrances whenever possible. Some homes have been found with ten or more entry points, and missing even one means the squirrels simply reroute.
No bait is used with exclusion devices. The goal is to let existing squirrels exit naturally, not attract new ones. The installation needs to be tight, with the device screwed in and screened securely against the surface, because squirrels will try to chew past or around it. Once all squirrels are confirmed out, the final opening gets permanently sealed.
For the sealing itself, galvanized steel mesh or hardware cloth works far better than wood or foam, which squirrels can gnaw through quickly. Metal flashing over vulnerable areas like fascia gaps and soffit vents adds a layer of protection they can’t easily defeat.
Keeping Squirrels Off the Roof
Trim tree branches so they’re at least eight feet from your roofline. Squirrels are excellent jumpers, so anything closer gives them a launching pad. If you have bird feeders near the house, move them well away from the structure or switch to squirrel-proof designs, since scattered seed draws squirrels into your yard and close to your roof.
Inspect your roofline at least twice a year, ideally before each breeding season in late winter and early summer. Look for gaps at the roof return, deteriorating fascia, damaged soffit vents, and loose ridge vent caps. Small repairs now prevent much larger problems later. Metal vent covers designed to resist chewing are worth the upgrade over plastic ones, which squirrels treat as minor obstacles.
Legal Restrictions on Trapping
Before you set a trap, check your state and local wildlife laws. Regulations vary significantly by location, and many places have rules that surprise homeowners. In Massachusetts, for example, it’s illegal to capture and relocate any wild animal, including gray squirrels. Trapping or possessing a gray squirrel outside of open hunting season without a permit carries fines of $20 to $50 per violation, plus a restitution fee of $25 per animal. Property owners can take action against animals actively damaging their property, but only during open season unless they’ve obtained a special permit from the state wildlife agency.
Other states have their own versions of these restrictions. Some require licensed wildlife control operators for any trapping. Some protect certain species (like flying squirrels) more strictly than common gray squirrels. The penalties and permitting requirements differ, but the pattern holds: you generally can’t just trap and dump a squirrel in a park across town. This is one of the reasons one-way exclusion is the preferred approach. It removes the animals without trapping or handling them, sidestepping most legal complications while being more effective in the long run.