Wildlife
Wildlife exclusion
The professional standard for raccoons, bats, squirrels, and skunks in buildings is inspect, determine occupancy (including young), install a legal one-way device or timed eviction, then repair the envelope with materials the animal cannot reopen. Poisoning wildlife is illegal in many cases and creates rabies-handling and carcass problems.
When this method is the right tool
Use licensed nuisance-wildlife control whenever the species is a rabies vector, a migratory bird, or in a chimney, or when young may be present. DIY is more realistic for a squirrel in a soffit after you confirm no kits, and even then building code and seals matter.
How to do it
- Identify the animal and the hole. Tracks, latrines, grease, and timing (dusk exits) tell you more than a guess from a thump.
- Check for young. Sealing a mother out is how you get dying young in insulation and a smell that requires tear-out.
- Use a one-way door when appropriate. Let residents leave, then seal. This is standard for bats after maternity season in many US states.
- Rebuild with metal and caps. Chimney caps, vent guards, and flashing. Plastic owl statues do not count.
Hardware this method is written for
Caps, cloth, and mesh after the animal can leave. One-way devices for bats are a timing-and-law problem.
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Hardware
Animal-guard chimney cap
An open flue is a raccoon and bird motel. Cap it after you know the chimney is empty. A cap is exclusion. A live trap in an attic with young inside is a different, often licensed, job.
Hardware
1/4-inch galvanized hardware cloth
Cut patches for vents, soffits, and the gaps foam cannot hold. Quarter-inch mesh stops mice; rats need a heavier gauge and no loose edges. Fasten to wood or masonry, then seal the rim.
Hardware
Copper mesh for rodent gaps
Stuff quarter-sized and smaller holes after you know the runways. Steel wool rusts and gets pulled out. Mesh is not a substitute for a door sweep on a half-inch gap.
Hardware
Headlamp or flashlight for inspections
German cockroaches, rodent runways, and bed-bug harborages are night-shift jobs. A light you can point into a hinge beats another can of spray.
Mistakes that waste money
- Mothballs in an attic (not a legal or effective wildlife fumigant in occupied housing).
- Relocating a raccoon across county lines (illegal or cruel in many states, and it does not fix the hole).
Safety
Do not handle bats. If a bat was in a room with a sleeper or child, call local public health before releasing it. CDC rabies protocol exists because memory is a bad test for a bite.