🧰 Tools & Materials
One-way exclusion funnelHardware clothSheet metalSnap traps (optional)Flashlight and binoculars
📋 Step-by-Step
1
Identify all entry points from outside
Use binoculars to inspect the roofline from the ground. Look for: chewed wood around soffit-fascia junctions, gaps at gable vents, damaged or missing soffit panels, and where utility lines contact the building. Mark every potential entry point — squirrels can use a gap as small as 1.5 inches.
2
Install one-way exclusion funnels at main entry points
One-way funnels (LCB traps or commercial exclusion funnels) let squirrels exit but prevent re-entry. Install at the 1-2 primary active entry points identified by fresh chewing marks and rub stains. Leave in place for 5-7 days.
3
Seal all secondary entry points first
Before installing one-way devices: permanently seal ALL other potential entry points with hardware cloth + screws or sheet metal flashing. If you seal only the primary entry, squirrels will expand a secondary entry into their new main access.
4
Remove one-way devices after 7 days and seal
After 7 days with no trapped squirrels in the attic (confirm by checking for fresh droppings or sounds), remove the one-way devices and permanently seal those entry points as well.
5
Trim branches 6+ feet from roofline
Squirrels jump up to 6 feet from a branch to a roof. Any branch within 6 feet horizontally is a launch point. Trim all trees to eliminate this access — the most important long-term prevention step.
💡 Pro Tips
💡 Gray squirrels may have young in the attic from January-February and June-July — exclusion during these periods separates mothers from young, causing problems. If young are present, wait until they're mobile before exclusion
💡 Never seal an entry point without confirming squirrels have exited — entombing squirrels in walls creates odor and damage issues
💡 Flying squirrels are smaller and enter through smaller gaps than gray squirrels — use 1/2-inch hardware cloth vs the 1-inch mesh that stops gray squirrels
⚠️ Warnings
⚠️ Check local wildlife regulations — squirrel trapping may require a permit in some jurisdictions
✅ How to Know It's Working
Pest control success is measured in weeks, not days. Here's what to look for:
- Week 1–2: You may see increased activity as pests are flushed from hiding. This is normal.
- Week 2–4: Activity should drop noticeably. Bait traps or sticky monitors should show declining counts.
- Week 4–6: New activity near zero. Any resurgence means a population was missed or re-introduction occurred.
💡 Monitoring tip: Place sticky traps in corners and along walls before you start treatment. Counting catches weekly gives you objective data on whether the population is declining.
👷 When to Call a Professional
DIY is appropriate for small, contained infestations caught early. Call a licensed professional when:
- You've tried DIY twice with no lasting improvement
- The infestation involves a wall void, crawlspace, or area you can't safely access
- There's a health risk involved (hantavirus, anaphylaxis risk, etc.)
- The problem covers more than one room or a large outdoor area
- You have children, elderly, or immunocompromised individuals in the household
⚠️ Rule of thumb: If you've spent more on DIY materials than a professional visit would cost, it's time to call.
❓ Frequently Asked Questions
How do I get squirrels out without harming them?
Install a one-way exclusion door over the primary entry point. Squirrels exit to forage but cannot re-enter. Leave it for 5-7 days, then seal the opening permanently with hardware cloth or metal flashing.
What time of year should I exclude squirrels?
Avoid exclusion from March through May and August through October when baby squirrels may be present. The ideal window is late fall (November) or mid-winter before spring litters arrive.
How do squirrels get into attics?
Through gaps at the roof-soffit junction, deteriorated fascia boards, unscreened roof vents, and where tree branches overhang within 6-8 feet. They can chew through rotting wood and plastic vent covers.
Will squirrels cause damage?
Yes. Squirrels chew electrical wiring (fire hazard), gnaw structural wood, tear up insulation, and leave waste that creates odor and health concerns. The longer they occupy the space, the more damage accumulates.