A squirrel needs only a 1.5-inch opening to enter an attic, and it can gnaw a smaller gap wider. Sealing that opening right away may sound sensible, but doing so can create a bigger problem if a squirrel is still inside.
For squirrel-proofing Nebraska attics, the order matters: inspect for activity, resolve active wildlife concerns, then close entry points with materials squirrels can’t chew through.
Start with an Exterior & Attic Activity Check
Inspect first, then seal. The eastern fox squirrel is Nebraska’s most common tree squirrel and occurs statewide, so a minor roofline opening can quickly become an active attic route.
Walk around the building in daylight and examine where the roof, siding, and trim meet. Pay particular attention to soffits, attic vents, loose fascia, damaged screening, gutter lines, and areas near overhanging trees.
Before covering an opening, look for signs of current use. Check from a safe location rather than climbing onto the roof or entering an unsafe attic.
- Look for gaps around vents, eaves, and roof transitions.
- Check for fresh gnawing, dark rub marks, displaced insulation, nesting material, or droppings.
- Listen for daytime scurrying or scratching, especially in the morning and late afternoon.
- Confirm that an opening is inactive before permanently securing it.
A sealed opening isn’t a successful repair if it leaves an animal inside. A trapped squirrel can move deeper into the structure, damage insulation or wiring, or die in an inaccessible area.
Use Barriers That Withstand Gnawing
Durable exterior coverage makes attic exclusion effective. Caulk and expanding foam can fill and air-seal small gaps, but squirrels can chew through them, so neither provides a stand-alone barrier.
After squirrel activity has been resolved, cover vulnerable openings with materials designed to withstand gnawing and weather. University of Nebraska-Lincoln Extension recommends metal flashing or 1/4-inch weave hail screen over repaired openings.
Roofline & Trim Gaps
Use metal flashing over the repaired area so vulnerable edges aren’t exposed to chewing.
Attic & Air Vents
Secure 1/4-inch hardware cloth over air vents and use professionally manufactured stainless-steel screens on roof vents. Don’t block ventilation or cover an outlet serving fuel-burning equipment without confirming its purpose.
Chimney Openings
A stainless-steel chimney cap can keep wildlife out once proper chimney function has been confirmed. The cap must not interfere with safe venting.
Reduce Routes to the Roof Before Winter
Reducing access to the roof makes completed exclusion work more likely to last. As colder weather arrives, squirrels often seek sheltered indoor spaces, and a nearby branch gives them a direct route to attic-level openings.
Extension guidance recommends keeping tree limbs at least 8 feet from buildings to reduce squirrels’ ability to jump onto roofs. This clearance also makes it easier to inspect gutters, fascia, and vent covers.
Focus outdoor prevention work on conditions that repeatedly bring squirrels close to the structure:
- Maintain adequate clearance between tree limbs and the building.
- Address loose trim, damaged soffits, and small roofline holes before squirrels enlarge them.
- Keep gutters clear so water doesn’t contribute to rot around fascia and eaves.
- Monitor bird feeders and fallen nuts that keep squirrels active near the building.
Tree work doesn’t replace exclusion, but it reduces traffic around the areas where squirrels are most likely to find structural weaknesses.
Know Nebraska Rules Before Trapping or Relocating
Relocating a trapped squirrel elsewhere isn’t a legal solution in Nebraska. University of Nebraska-Lincoln Extension guidance states that a captured problem squirrel must be released within 100 yards of the capture site or euthanized. Municipal rules can be more restrictive, including limits on lethal traps in some communities.
Species identification also matters. Southern flying squirrels are a threatened, fully protected species in Nebraska and may not be trapped or harmed. They look different from the more common eastern fox squirrel, but identifying wildlife from noises alone is unreliable.
Avoid trapping during April and May whenever possible because it can orphan young squirrels. When an attic is active, the priority is a lawful, safe plan that accounts for the animal’s access route and the possibility of a nest.
Resolve Squirrel Activity Before Final Sealing
Attic trapping involves more than placing a trap near a noise. Nebraska wildlife guidance notes that trapping is less successful unless the attic can be safely lighted and traps can be placed within a few feet of a nest. Entering an attic also requires appropriate respiratory protection because insulation, droppings, and dust present health and safety concerns.
Follow this sequence when squirrel activity is suspected:
- Inspect the exterior and accessible attic areas for openings, nesting signs, and damage.
- Determine whether squirrels are actively using the structure.
- Resolve active wildlife concerns before closing the main access point.
- Verify that activity has stopped before installing durable covers and completing repairs.
- Reinspect the roofline and vents after severe weather or seasonal tree damage.
Our Squirrel Control process begins with an on-site inspection of entry points, nesting sites, and visible damage. Based on the property, we can use humane exclusion techniques, one-way doors, and deterrents. Once the squirrels are gone, we discuss prevention measures such as vent covers, trim repair, sealing, and tree limb trimming.
Make Pre-Winter Inspections a Routine
A pre-winter inspection is easier and safer than responding after a squirrel has settled into an attic. Examine the roofline before cold weather, confirm that previous repairs remain secure, and check again after wind, hail, or falling branches damage vents or trim.
Use this maintenance checklist each year:
- Review soffits, vents, chimney areas, and gutter lines for new damage.
- Check flashing, hardware cloth, and stainless-steel screens for loose edges or corrosion.
- Maintain tree clearance and keep gutters free of debris.
- Watch for fresh gnawing, rub marks, droppings, or displaced insulation.
- Arrange a follow-up inspection if you hear attic activity or find new damage.
For active attic squirrels or a property-specific squirrel removal plan in Nebraska, our fourth-generation, family-owned company provides inspections by licensed, trained technicians, backed by more than 45 years of pest management experience across the Wyo-Braska region.
Call Benzel Pest Control at (308) 888-9924 to arrange an inspection.