Noise in a hot attic is not always a rodent. Heat makes wood, ducts and roofing expand and contract, and they can click, tick and pop, mostly in the afternoon and early evening as the roof cools. Scratching, scampering and gnawing that moves around, especially after dark, point to animals.
Telling heat sounds from animal sounds.
| What you hear. | When. | Likely cause. |
|---|---|---|
| Single ticks or pops. | Afternoon into early evening. | Roofing and framing cooling. |
| A low rumble or whoosh. | When the air conditioning starts. | Air moving through ducts. |
| Scampering or scratching that travels. | Dusk and through the night. | Rodents running along joists. |
| Rhythmic gnawing. | Night, often near a wall or vent. | Rodents chewing wood or wire. |
| Heavy thumps. | Dusk, sometimes at dawn. | A rat or a larger animal. |
Timing is the best clue. If it happens only when the sun is high and fades as the house cools, heat is the likely cause. If it begins after dark and moves around, call.
Signs besides sound.
Listen is one test. Look is the other. Without going into the attic, you can learn a lot from the garage ceiling, the closets, the air handler closet and the vents.
- Dark droppings near the attic hatch or on the garage shelf below it.
- Stains on a ceiling, especially near a vent or wall.
- A sharp smell near the air handler or a bath vent.
- Torn insulation visible around the hatch edge.
- Chewed flexible duct or a loose vent cover.
If you find several of these, the evidence is stronger. One alone may mean nothing.
Why a hot attic still draws animals.
An attic is shade and shelter, and insulation is soft nesting material. Animals may use it during the cooler parts of the day and night, and move to lower, cooler spaces when it is hottest. Soffit gaps, roof vents and a loose hatch are common ways in.
A hot attic is also dangerous for people. If you need to go up, do it early in the morning, wear gloves and a mask, bring water and stay short. If you have any doubt, do not go.
Snap a photo of the droppings or chew marks and mention it on the phone, which saves time.
Ring (888) 686-4821What a technician does up there.
The technician begins outdoors along the roofline and then heads for the attic hatch. Inside, the focus falls on channels through the insulation, smudges on joists and pellets near the hatch. Pellets are tallied and photographed, and how big and how fresh they are points to the species.
You receive findings in everyday language plus a plan and a cost. If the sound turns out to be ductwork or flapping flashing, we tell you that too. See our inspection page for what the visit includes.
Cleanup and insulation.
Insulation that is soiled, flattened or full of droppings should come out, but only once the animals have left and every entry is closed. Cleaning too early means doing it twice. Attic cleanup is scheduled for cooler hours, with extra breaks.
Chewed ducts waste cooled air and can drip condensation, so repair is worth doing. Damage repair is priced as its own line, which lets you see the cost.
Before you call.
Note the time of the noise, the room beneath it and anything you saw or smelled. Make sure kids and pets stay away from the hatch, and do not sweep or vacuum droppings. Then call, and we start from your notes.
Safety checklist for rodent droppings
Read through every line before handling anything, because a short pause spares your lungs.
- A shop vac seems thorough yet may push tiny particles back out into the room.
- A garage, shed or crawl space that has sat closed should get roughly half an hour of through-draft before you enter.
- Anything near droppings can carry unseen germs, which is why gloves go together with a real handwash.
- Leave droppings alone until they are drenched and have sat for around five minutes.
- Droppings and wipes share one tight bag, and your skin never meets a dead animal.
- A physician alone can weigh how serious an exposure was, so reach out to one should fever or labored breathing set in.
Sources behind the safety tips
Agency pages stand behind each safety statement, listed next with a note about what each covers.
- CDC page on cleaning up rodent waste: Ventilating shut-in spaces, misting droppings instead of sweeping them, and bagging waste carefully.
- CDC hantavirus prevention page: Staying healthy near rodents: seal, trap and clean up carefully.