Squirrels, Raccoons, and Your Attic: When Noise Means Damage

That scratching or thumping overhead is worth paying attention to. In Central New York, squirrels and raccoons are the most common attic invaders, and both do real damage — not just noise, but chewed wiring, torn insulation, and health hazards. Knowing what you're likely dealing with, and why removal alone isn't enough, saves a lot of money and worry.

Squirrels: the fire-risk you can hear

Gray squirrels are the classic attic invader, entering through roofline gaps and chewed soffits, often using overhanging branches as a highway. Flying squirrels — smaller and nocturnal — are a close second in wooded areas and often go unnoticed for months. The serious concern with squirrels is gnawing: chewed wiring is a documented cause of house fires, which is why an attic squirrel problem is more than an annoyance. You'll usually hear them most at dawn and dusk.

Raccoons: strength and health risks

Raccoons are stronger and messier. Females den in attics and chimneys in spring to raise litters, tearing open soffits, vents, and roof edges to get in. Their droppings carry raccoon roundworm, a genuine health hazard that requires careful cleanup. Between their strength and the health risk, raccoon removal is firmly a job for professionals — and in spring and summer, it usually means accounting for young in the den.

Why removal without sealing fails

Wildlife returns to reliable den sites, and a gap that let one animal in will let the next one in too. That's why the durable fix is always removal plus exclusion: getting the animal out, then sealing the entry with materials strong enough to keep it out — chew-resistant for squirrels, heavy-duty for raccoons. Where droppings and soiled insulation remain, cleanup and attic restoration close the loop, removing both the health hazard and the scent that draws the next animal.

What the damage actually consists of

The noise is what people call about; the damage is usually what costs. Compressed and soiled insulation loses much of its R-value, which shows up as a heating bill in a climate like ours. Gnawed electrical wiring is a genuine fire risk and is common with squirrels, which gnaw continuously. Torn ductwork, damaged vent screens, and enlarged entry points let in weather as well as the next animal.

Contamination is the other half. Accumulated urine and droppings soak into insulation and framing, and raccoon droppings can carry raccoon roundworm, which makes contaminated attic material a health matter rather than just a mess.

Deciding what to replace

Not every occupied attic needs its insulation removed. A brief intrusion caught early may need very little. A long-established raccoon latrine or a heavily used squirrel nest area is different, and the useful questions are how contaminated the material is, whether it has lost its function through compression, and whether odor is drawing further animals in — scent from a previous occupancy genuinely attracts new ones.

The sequence that avoids wasted money is: get the animals out, seal every entry, then assess cleanup. Replacing insulation before the building is closed means doing it twice.