Scratching in the Attic? What Roof Openings Can—and Can't—Tell You

Hearing scratching over your head is unsettling, and the first instinct is to guess what's up there. Before you guess, it helps to know what the clues can actually tell you — and what they can't.

What to notice

Three things are worth writing down: when you hear it, what it sounds like, and where it seems to be. Day or night matters. Light, fast pitter-patter is different from a heavy, slow thump. One spot over a bedroom is different from sound moving through the walls.

What the timing can suggest — not prove

Daytime fast scurrying, especially around dawn and dusk, points toward squirrels — they're active during the day. Nighttime light, rapid scratching or pitter-patter points toward mice or rats. Heavy thumps at night point toward a bigger animal, like a raccoon. Fluttering or high-pitched squeaking around dusk points toward bats or birds.

That's as far as sound goes. It narrows the field; it doesn't identify the animal. Different animals make similar sounds, and house acoustics play tricks. If you don't see the animal, even experienced people can struggle to say for sure what's up there from sound alone.

What roof openings can tell you

A roof has a handful of openings animals use: the ridge vent along the peak, whose edges animals can lift or chew; vent pipes, which are open passages from the roof down; gaps where the soffit meets the roof; and gable vents without screening. The sizes are smaller than most people expect — a mouse can use a gap about 1/4 inch wide, roughly a pencil's width, and a rat about 1/2 inch. A gap you'd walk past on the ground can be a front door for a mouse.

An opening tells you where animals could get in. It doesn't tell you whether anything is inside right now, which opening was actually used, or whether sealing that one opening solves the problem. Animals often use more than one way in.

What openings can't tell you — and why that matters

This is the important part: an opening can't tell you whether animals are living in the attic. And that changes the job completely.

Sealing openings is exclusion — keeping animals out. Getting animals out is removal, and it's a different job done by a wildlife or pest professional. We don't trap, remove, or treat animals, and we don't use pesticides. If animals are already living in the attic, removal comes first. We seal after they're out, never while they're inside — sealing animals in traps them, and they'll either chew a new way out or die inside.

Bats are protected in Michigan. Michigan DNR advises avoiding exclusion during maternity season, typically May through mid-August, to prevent trapping flightless young. We refer all bat jobs to a wildlife control professional.

What you can do without getting on the roof

You don't need to climb up to help. Note when you hear it, what it sounds like, and where. Then tell us what's happening with your roof. We'll review the information and contact you about the next step. Leave the roof itself to the roofer — that's the safe way to get a real answer about which openings matter on your house.

Learn more about sealing roof-side openings: Roof Pest Prevention. Metro Detroit Roof Repair — (586) 698-7094, serving Wayne, Oakland & Macomb counties, Mon–Sat 7 AM–7 PM.