Possums typically get into your house through gaps in the roof, uncapped chimneys, uncovered vents, and damaged roofing materials. They’re excellent climbers, so even entry points high off the ground are fair game. Once on your roof, they exploit any structural weakness they can find to squeeze inside, and they’re surprisingly persistent about it.
How They Reach Your Roof
Possums are as comfortable in trees as they are on the ground, which means anything touching or overhanging your roofline is essentially a highway. Tree branches that extend over your house give them a direct path to your roof. From there, they walk along gutters, ridgelines, and downpipes looking for a way in.
They also climb fences, trellises, pergolas, and stacked materials leaning against exterior walls. Anything that provides a vertical surface with grip can serve as a ladder. Items stored against the side of your house, like firewood piles, old furniture, or even dense shrubs growing close to the foundation, give possums cover and climbing access they wouldn’t otherwise have.
Common Entry Points
Once a possum reaches your roof, it looks for gaps, and most houses have more than you’d expect. The most common entry points include:
- Gaps in roofing or eaves: Loose or damaged tiles, warped fascia boards, and deteriorating soffits all create openings large enough for a possum to push through.
- Uncapped chimneys: An open chimney is an open invitation. Possums can climb down into them or use them to access attic spaces.
- Uncovered vents: Roof vents, gable vents, and exhaust openings without screens or covers are easy access points.
- Drainpipes: Larger downspouts can serve as both a climbing route and an entry point where pipes connect to the roofline.
Possums don’t need a large hole. If there’s a small weakness in your roofing material, they’ll widen it by gnawing wood or pulling at damaged sections until the gap is big enough to squeeze through.
What Attracts Them Inside
Possums are nocturnal and spend their days sleeping in sheltered, concealed spots. Your attic, crawl space, or wall cavity offers warmth, protection from predators, and a dry place to rest. They don’t necessarily move in permanently. Possums rotate between several den sites, so your attic might be one stop on a regular circuit.
Outside the house, several things draw possums onto your property in the first place. Dog food or cat food left outdoors is a reliable attractant. Overripe fruit that’s fallen from trees, vegetable gardens, and compost bins all provide easy meals. Even insect-heavy gardens appeal to them, since possums eat snails, slugs, and insects. The more reasons a possum has to visit your yard nightly, the more likely it is to eventually discover a way into your house.
During February’s mating season, males wander further than usual searching for a mate, which increases the chances of one finding its way onto your property and exploring your roofline for the first time.
Signs a Possum Is Already Inside
The first clue is usually sound. Possums moving through an attic produce thumping, scratching, and scampering noises, mostly at night when they wake up and head out to forage, and again in the early morning hours when they return. They’re heavier than rats or mice, so the footsteps sound more deliberate. You may also hear hissing, clicking, grunting, or screeching, especially if more than one possum is present.
Smell is the second giveaway. Possums have scent glands that produce a distinctly musky odor, and the accumulation of urine and feces in an enclosed space like an attic intensifies quickly. Their droppings are cylindrical, about one to two inches long, smooth-sided, and curled at the ends. Older droppings often develop a white or yellowish mold on the surface.
If a possum has been living in your attic for any length of time, you’ll likely find a nest made from leaves, grass, shredded paper, and torn insulation tucked into a corner or along the rafters. They tear away attic insulation to use as nesting material and gnaw on wood, stored belongings, and electrical wires. Chewed wiring is a genuine fire hazard and one of the more serious consequences of a possum taking up residence.
How to Find Their Access Point
The most reliable method is to watch your house at dusk. Possums leave their daytime shelter after dark to forage, so positioning yourself where you can see the roofline as the sun goes down will often reveal exactly where the possum exits. Look for the route it takes: does it drop from a particular section of eave onto a tree branch? Does it emerge near a vent or a gap in the fascia?
During the day, inspect your roof from the outside for visible damage. Look for torn or lifted shingles, gaps where pipes or wires penetrate the roof, missing vent covers, and any section of soffit or fascia that appears chewed, scratched, or pulled away. Smudge marks and fur caught on rough edges can also point you toward active entry points.
Sealing Entry Points
Once you’ve confirmed where the possum is getting in and you’re certain it has left for the night, you can block access. The key is using materials strong enough that the possum can’t chew or pull its way back through.
Half-inch galvanized hardware cloth is the standard for wildlife exclusion. It’s strong, durable, and can be shaped to cover irregular gaps in eaves, vents, and soffits. For areas where you need something more rigid, galvanized sheet metal attached with screws resists removal by possums and raccoons alike. Stainless steel mesh is the most durable option and won’t rust over time. Aluminum flashing works well for wrapping corners and edges where roofing meets walls.
For smaller cracks and gaps, caulk, sealant, or copper gauze stuffed into the opening will block access. Foam insulation alone isn’t sufficient for a determined possum, but it can supplement a stronger barrier. Chicken wire or wood can also be used to fill larger holes.
Don’t seal the entry point while the possum is still inside. If you’re not sure whether it has left, install a one-way door over the opening. This lets the possum exit but prevents it from returning. After a few days, once you’re confident the space is empty, replace the one-way door with a permanent seal. Check for and block any secondary entry points at the same time, including gaps around drainpipes and chimney openings, so the possum doesn’t simply find an alternate route back in.
Reducing Attractions Around Your Property
Sealing entry points solves the immediate problem, but possums will keep visiting your property if the conditions that attracted them remain. Bring pet food bowls inside at night. Pick up fallen fruit regularly. Keep compost bins sealed. Trim tree branches so they don’t overhang or touch your roofline, removing the most common climbing path to your roof.
Clear objects stacked against exterior walls, including firewood, old equipment, and dense vegetation growing right up against the foundation. Possums prefer to travel with cover on at least one side, moving from plant to structure rather than crossing open ground. The less concealment your yard offers, the less comfortable it is for a possum passing through. Reducing hiding spots during the day, like large leaf piles, overturned pots near fences, and gaps under decking, makes your property a less appealing stopover on their nightly route.