Attic pests in New Hampshire

An attic smell is usually rodent, squirrel, or bat nesting, a dead animal, or roof-leak mold. NH pest pros explain the health context and cleanup.

Yes, yellowjackets readily nest in wall voids and attics. Never plug the entry hole — trapped wasps can chew through into the living space. Here's why.

Chipmunk burrows can undermine patio slabs and steps and channel water toward a foundation, but they don't damage a properly built house foundation. Here's why.

Trap first, confirm vacancy, then seal — sealing an occupied attic traps rats inside to decay. Roof-rat entry points and the extension-backed removal sequence.

Yes — an established bat colony's urine and guano can saturate and ruin insulation over time. Here's what's real, what's not, and why exclusion is the only fix.

Bird droppings are acidic and etch paint and clear coat, especially in the sun. Real metal corrosion needs heavy, years-long buildup — here's the honest split.

A nest can block a flue and dry material can ignite from sparks — a real hazard. But creosote, not nests, is the leading cause of actual chimney fires.

Sluggish flies with golden thoracic hairs clustering at attic windows are cluster flies, not house flies. Here's the real tell — and why they aren't breeding.

It depends on the spider. Most house spiders already live indoors year-round and simply cluster in undisturbed attics and basements once winter sets in.

An unheated garage or attic stays warm enough to shelter rodents all winter. Decluttering, hard-sided storage and sealing gaps protects what's stored there.

Do this first, but honestly: screening attic vents with hardware cloth is a homeowner job, while roofline repair is often a roofer's. Here's which is which.

Yes, cluster flies overwinter in attics — but they roost there, they don't breed there. Here's what diapause actually is and why it changes nothing you fear.