Roof rats are in your attic because they can reach it and find food there

Roof rats — also called black rats — nest in the upper parts of buildings because they are excellent climbers. They enter through gaps in soffits, vents, roof edges, and tree branches that touch your roof. Once inside, they stay if they find food (pet kibble, pantry items, bird seed) or nesting material. Getting rid of them means blocking entry points, removing what attracts them, and trapping or poisoning those already inside. The process usually takes two to four weeks and often requires a pest control contractor, especially if the infestation is large or the entry points are hard to reach.

Key Takeaways

  • Roof rats enter through gaps smaller than a dime in soffits, vents, fascia boards, and roof edges — sealing these is the only permanent solution.
  • Remove food sources: find pet food indoors, trim tree branches six feet from the roof, clean up fallen fruit and nuts, and store pantry items in sealed containers.
  • Trapping is faster and safer than poison if you can access the attic; poison kills rats inside walls where they decompose and smell for weeks.
  • A pest control contractor can identify entry points you cannot see and seal them properly, which costs $300 to $800 but prevents re-infestation.
  • Rats reproduce quickly — a female can have five to eight litters per year — so waiting makes the problem worse.

Seal entry points before you trap or poison

Roof rats can squeeze through any opening larger than a quarter-inch. Check the entire perimeter of your roof for gaps in soffits (the underside of the roof overhang), damaged fascia boards, gaps around pipes and vents, and spaces where the roof meets the walls. Look at the foundation and ground level too — rats can climb up from there. Use hardware cloth (a metal mesh) or steel flashing to seal these gaps; caulk and foam do not work because rats chew through them.

If you seal entry points before removing the rats inside, you trap them in your attic and walls, where they die and decompose. Trap or poison first, wait a week to confirm no new activity, then seal. If you cannot reach the roof safely or identify all the gaps, hire a pest control contractor to do this step — it is the difference between solving the problem once and dealing with it again in six months.

Remove food and water sources they depend on

Roof rats will not stay if there is nothing to eat. Bring pet food indoors at night or store it in sealed metal containers. Pick up fallen fruit, nuts, and seeds under trees. Remove bird feeders or place them far from the house and clean up spilled seed daily. Store pantry items — flour, cereal, nuts, dried fruit — in airtight containers, not cardboard boxes. Rats can chew through cardboard in hours.

Check your attic for water sources: leaking pipes, condensation, or standing water in gutters. Rats need water daily, so eliminating it makes the space less attractive. Trim tree branches so they do not touch the roof or hang over it — this removes the highway rats use to reach your house.

Trapping is usually faster than poison

Snap traps and electronic traps kill rats in the attic where you can find and remove the bodies. Snap traps are cheap ($1 to $3 each) and work quickly; bait them with peanut butter or nesting material like cotton balls. Place them along walls and in corners where you see droppings or gnaw marks. Check traps daily. You may catch several rats over a week or two.

Poison (rodenticide) works but has drawbacks: rats often die inside walls or inaccessible spaces, and the smell can last for weeks. Poison also risks harming pets and wildlife if they eat poisoned rats. If you use poison, place it in tamper-resistant bait stations in the attic only, never in living areas. Do not use poison if you have pets or children who can reach it.

Electronic traps are faster than snap traps — they kill on contact — but cost $20 to $50 each. They are worth the price if you have a large infestation and want to finish in days rather than weeks.

When to hire a pest control contractor

Hire a contractor if the infestation is large (many droppings, sounds in multiple walls), if you cannot safely access the attic, or if you have sealed entry points and rats are still getting in. A contractor will inspect the entire structure, identify all entry points, remove current rats, and seal gaps properly. They typically charge $300 to $800 for inspection and sealing, plus $100 to $300 per visit if trapping is needed.

Ask the contractor whether they may provide their work — many offer a warranty that covers re-infestation within 30 to 90 days. This is worth paying extra for because it means they will return and seal any gaps they missed. Get quotes from at least two contractors before deciding.

What to do if you hear rats but cannot find them

Roof rats are nocturnal, so you hear them at night — scratching, running, squeaking in walls and ceilings. If you cannot locate them in the attic, they are likely in wall cavities. Place snap traps or electronic traps in the attic anyway, along walls and near vents. Rats move between the attic and walls constantly, so traps in the attic will catch them. You can also drill small holes in drywall where you hear activity, insert a camera or flashlight to look inside, then patch the holes afterward.

Do not assume the problem will go away. Rats reproduce fast — a female can have five to eight litters per year, each with five to eight pups. A small infestation becomes severe within weeks if left untreated.

Preventing roof rats after you have removed them

Once you have sealed entry points and confirmed no rats remain (no new droppings, no sounds for two weeks), keep them out by maintaining your prevention steps. Trim trees regularly, store food in sealed containers, clean gutters, and inspect the roof and foundation twice a year for new gaps. Check for signs of return: droppings, gnaw marks on wood or wires, or sounds at night. If you see any, set traps when ready — catching one or two rats is far easier than dealing with a new infestation.

Some homeowners have a contractor perform an annual inspection and seal any small gaps that develop. This costs $100 to $200 per year but prevents the problem from starting again.

Frequently Asked Questions

Can I use poison in the walls if I cannot trap them?

You can, but rats often die inside walls where you cannot reach them, and the smell lasts for weeks or months. If you use poison, place it only in the attic in tamper-resistant bait stations. Never use poison in living areas or where pets can reach it. Trapping is slower but cleaner.

How do I know if the rats are gone?

Stop hearing them at night, see no new droppings for two weeks, and find no fresh gnaw marks. Set one or two traps as a test — if they remain unsprung after a week, the infestation is likely over. Seal entry points only after you are confident they are gone.

Will my homeowners insurance cover pest control?

Most homeowners insurance does not cover pest removal, but it may cover damage rats cause — chewed wires, damaged insulation, or structural harm. Check your policy. Some contractors offer payment plans or discounts if you pay upfront.

Can roof rats cause electrical fires?

Yes. Rats chew through electrical wiring in attics and walls, exposing live wires. This can cause short circuits or fires. If you suspect rats have damaged wiring, have an electrician inspect the attic before sealing entry points.

What if I live in an apartment or condo?

Notify your landlord or property management when ready — they are responsible for pest control in shared buildings. If they do not respond, check your local tenant laws; many require landlords to address infestations within a set timeframe. Document the problem with photos and dates.