How can I protect my attic from mice and rats during winter?

An attic offers everything a rodent wants in December: it's warm relative to outdoors, it's quiet and undisturbed for weeks at a stretch, and it's packed with insulation that doubles as nesting material. The part homeowners underestimate is how the animals actually get up there. Mice climb rough vertical surfaces — brick, stone, worn wood siding — competently, and they jump farther and more accurately than their size suggests. Roof rats, where present, are specifically adapted to elevated entry and often prefer the roofline over the ground floor entirely (UNL Extension). So a house that's fully sealed at the foundation and door thresholds can still take on an attic population, because nobody checked the vents.

Gable vents, ridge vents and soffit vents are all designed to let air move, not to keep animals out — factory screening on most vents is thin enough for a mouse to chew through or for a squirrel to pry loose. The fix is quarter-inch hardware cloth, not standard window screen and not half-inch mesh; half-inch is wide enough for a mouse to pass through, so it solves nothing (extension.org). Cut the mesh to fit, screw or staple it over the existing vent opening from the outside, and check that it still allows airflow — the goal is exclusion, not sealing the vent shut, since attics need to breathe.

This part is realistically a ladder-and-an-afternoon job for most one- and two-story homes. It gets harder, and more dangerous, at steep pitches or heights beyond a single-story roofline — that's the point where a roofer's equipment and experience are worth paying for rather than improvising.

Gaps where the soffit meets the fascia, or where flashing has pulled away, are common rodent entries that aren't a vent-screening problem — they're a roofing problem. Sealing them properly usually means working on or near the roof edge, sometimes replacing or re-securing trim, which is squarely a roofer's or carpenter's skill set rather than a pest control one. Being honest about this split matters: a pest company that tells you it will "seal your roofline" as part of a treatment visit is often either subcontracting the work or doing a temporary patch. The durable fix is a roofer, and Anchor's honest role is identifying that the gap exists, not repairing the roof.

A tree branch touching or overhanging the roof is a bridge, plain and simple — it gives climbing rodents and squirrels a path onto the roof that bypasses every ground-level gap you sealed. Cutting branches back six to eight feet from the roofline removes that bridge and is straightforward homeowner or arborist work depending on the tree's size and location relative to power lines. This is one of the cheapest, highest-leverage moves in the whole cluster, and it's routinely skipped because it doesn't feel like "pest control" — it feels like yard work.