Rats, mice, squirrels, raccoons, skunks, bats, opossums, and birds are among the most common culprits in this kind of situation.
Sometimes these types of noises are related to wind, thermal expansion, or mechanical & eletronic equipment inside. But more often than not, scratching in your walls or ceiling is caused by a rodent inside your house.
Here are some tips: Listen carefully to the sounds: Different animals have their distinct sounds. Scratching, gnawing, and scampering sounds are commonly associated with rodents like rats and mice, while chattering, chirping, and scampering sounds may indicate the presence of squirrels.
Rats, mice, raccoons, and bats are nocturnal. So if you hear animals in the attic at night, those are the most likely culprits. Squirrels and birds usually are active during the day. If you hear squeaks or scurrying in the morning, it's probably a squirrel.
You could also hear a scurrying noise as they move quickly across your attic. Chirps and squeaks are also common in mice, but rats usually communicate at a pitch that humans cannot hear. As mentioned, rats and mice are nocturnal, so you probably won't hear them during the day, even if you're home and near your attic.
Signs of Opossums in the Attic
Scratching, scampering, and rustling sounds coming from the attic, especially at night when they are awake and active. Strange noises in the attic also include their vocalizations, such as grunts, hisses, clicking, and screeches.
You might not see them, but you will likely hear rats scampering about in ceilings and wall cavities. Hearing scratching, scurrying, and squeaking sounds is a fairly definitive sign that rodents have invaded. You might also hear gnawing and falling debris as rats burrow into tight spaces.
The Point of Entry
Check the roofline, gutters, and vents. Chewing marks around a two-inch hole may be the work of a squirrel. Smaller holes with grease marks and trails are the work of rodents like mice and rats. Additionally, a large hole torn into the roofing and siding is most likely a raccoon.
Rats and mice are the most notorious pests found in roof cavities. They are easily identifiable by their nightly activities of scratching, squeaking, chattering and gnawing. Since they're moody little creatures, the noises can often be loud and quite annoying!
Usually, a local animal removal service will charge a flat fee of $150 to $250 for basic trapping and removal. But it becomes more expensive when animals are in hard-to-reach places. These hard-to-reach spaces include: Attic removal costs: $200–$1,500.
First, look for cracks or holes in your walls or ceilings, and seal them with caulk or other materials. You may also need to trim back trees or bushes close to your home, as these can provide rodents with a way to access your roof. Some individuals prefer to try to ward off rats using peppermint oil.
Nocturnal Noises: Unlike squirrels, rats are more active at night. If you hear scurrying or gnawing sounds in the attic after dusk, rats are likely the culprit. Holes and Damage: Rats can chew through various materials, including insulation, wood, and even wiring, posing fire risks.
The good news is that these unsettling sounds are usually totally normal, and pose no immediate threat to the structural integrity of your home. Specifically, these sounds are due to the shifting, settling, and adjusting caused by changes in the temperature outside.
Because raccoons are relatively large animals, their movement can create loud thumping sounds, compared to the quieter skittering noises of rodents. You'll likely hear raccoon footsteps or the sound of claws on the attic floor.
Squirrels commonly produce scurrying, scampering, and scratching sounds in the attic. Because of their size, it can be fairly loud. They often roll acorns or nuts, which describes that odd rolling sound emerging from the ceiling. Squirrels will also produce gnawing and grinding sounds similar to mice.
Squeaking and scratching sounds are some of the most common signs that there are rats in the ceiling. If you're able to look in your attic or the space where the sounds are coming from, you may see these other signs. For example, you might find gnaw marks on wood or drywall.
First up is the noise. If the sounds are in the daytime, especially early morning or evening, you have squirrels in your house. If the noise is at night but very heavy sounding, and slow, it's likely raccoons. Opossums are another option, but they are rarer.
I find that the most effective method to catch and remove animals is to seal off all of the entry points, down to the primary opening, and use live traps to trap the remaining animals inside.
The animals that tend to find their way into attics most often include: Mice. Rats. Red squirrels.
Peppermint oil — Essential plant oils like peppermint, rosemary, citronella, sage and lavender have strong botanical scents that rats dislike. One customer successfully repelled a rat by stuffing a peppermint oil soaked tissue into the rat hole chewed into the wall.
The first and most noticeable difference between roof rats and mice is their size. A roof rat, which is pictured above, is about twice as big as a mouse. A full-grown mouse will grow to just a few inches long, not including the tail. A full-grown roof rat's body, on the other hand, will be six to eight inches long.