How to Get Rid of Roof Rats
At a glance
- Difficulty: Advanced
- Time: A weekend for reachable exclusion work; professional trapping for an active colony typically runs several weeks
- Cost: Low for sealing materials; moderate-to-higher if a pro handles trapping and station placement
- Success: Good for exclusion done correctly; low for trapping an established colony without pre-baiting or professional technique
Can you DIY Roof Rat?
The verdict on Roof Rat DIY
Exclusion is DIY-doable; an established colony genuinely isn't — rats avoid new traps for days to weeks.
Roof rats (Rattus rattus) are agile climbers that nest at or above the roofline — attics, soffits, upper wall voids — entering through gaps as small as a nickel. Sealing those gaps is real, teachable DIY work. But rats are strongly neophobic: they avoid unfamiliar traps and bait on their travel routes for days to weeks, which is why the common 'just set a trap' advice underperforms on an actual colony. Combined with unsafe roofline access on many homes, an established infestation is honestly a job for a pro who knows how to pre-bait and place tamper-resistant stations correctly.
The 5 DIY methods — honestly graded
Every approach graded for this species, in IPM order — prevention first, chemistry late. Pick a method to see how it works, the steps, and what it actually takes.
Prevention / Exclusion
Works wellThe most reliable DIY lever for this species — but it has to target the roofline and canopy, not just ground-level gaps.
Roof rats are agile climbers that travel utility lines and tree limbs and nest at or above the roofline. Cutting off climbing routes and physically closing high entry points stops new rats from getting in, even though it won't remove rats already established inside.
Best for: Stopping new rats from climbing in — the foundation of any roof rat plan
Cut the climbing routes
Trim tree limbs and shrubs back at least 3 feet from the roofline and cut back ivy or vines touching the house — roof rats use them as highways to the roof.
TipDo this before fall, when rats increasingly seek indoor shelter.Screen every high opening
Screen gable, roof, and soffit vents with 1/2-inch or finer hardware cloth; fit rodent guards on utility lines and seal roofline gaps and pipe penetrations with steel wool plus caulk or sheet metal.
CautionA roof rat can pass through a gap about the size of a nickel — check fascia, soffit corners, and roof-to-wall joints closely.
Tools & materials
Why DIY falls short here
Not scare tactics — the specific, proportionate reasons a home attempt can stall for this species.
Neophobia stalls DIY traps and bait
Rats avoid new objects on their travel routes for days to weeks. A homeowner who sets an unbaited trap once and checks it the next morning usually finds it untouched and concludes trapping doesn't work — the real issue is missing the pre-bait step.
Elevated, hard-to-reach nesting
Roof rats nest in attics, soffits, and upper wall voids. Inspecting and sealing that many gaps safely, especially on a multi-story roofline, is genuinely difficult and can be dangerous without the right equipment.
Rapid rebound from partial control
Removing a few visible rats without full exclusion and colony-level trapping leaves the breeding population and outside immigration to refill the gap within weeks.
Bait hazards without expertise
Loose or improperly stationed rodenticide creates real primary poisoning risk to pets and kids and secondary poisoning risk to any predator that eats a poisoned rat.
How risky is it, really?
An honest read — most nuisance species are genuinely low risk, and we say so.
Roof rats carry real, proportionate risks — contamination and gnawing damage, not a 'plague' framing. The most likely problems are food and surface contamination and fire-adjacent damage from gnawing on wiring; leptospirosis is a genuine but occasional risk tied to urine-contaminated water or food, not casual contact.
- Salmonella and food contamination from droppings and urineCommon
Standard sanitation — discard contaminated food, clean and disinfect surfaces — controls this.
CDC
- Leptospirosis from urine-contaminated food or waterOccasional
CDC: infection occurs through contact with urine-contaminated water, soil, or food entering the eyes, nose, mouth, or broken skin — more likely with standing water or a heavy infestation, not casual proximity.
CDC — Leptospirosis
- Gnawing damage to wiring (a fire-risk-adjacent property concern)Common
Rats gnaw continuously to wear down their teeth; attic and wall-void wiring is a common target.
Pest-industry structural-damage reporting
- Secondary poisoning of pets or predators from rodenticideOccasional
Only a risk if bait is used improperly, outside a tamper-resistant station — one more reason to route chemical control to a pro.
See Anchor's pet-safety guidance
Roof Rat Colony Not Responding to DIY?
Neophobic rats and hard-to-reach rooflines are where DIY genuinely stalls. Anchor Pest Services handles exclusion, pre-baiting, and tamper-resistant station placement across southern and central New Hampshire. Family-owned since 2017, NH license #782664.
Call a pro when…
- Rats heard or seen in the attic or upper walls, not just outside
- Your own traps sit untouched for more than 1-2 weeks despite pre-baiting
- Roofline or multi-story access is needed for sealing
- Droppings show up in multiple rooms or areas of the attic
General Pest Control
Exclusion is genuinely DIY-doable for roof rats — but an established, breeding colony of neophobic rats avoiding your traps is a fair place to call in a pro. Anchor's licensed technicians pre-bait, place tamper-resistant stations correctly, and can safely access rooflines and attics you shouldn't be climbing into.
Keep them out
- Trim tree limbs at least 3 feet back from the roofline
- Screen every roof, gable, and soffit vent with 1/2-inch hardware cloth
- Secure pet food, birdseed, and fallen fruit
Roof rats in New Hampshire
Roof rats seek indoor shelter as temperatures drop toward Manchester's first hard frost (~Oct 19-29, NOAA), climbing from trees and utility lines into attics and upper wall voids. Late summer through early fall — before that frost — is the window to trim canopy access and seal roofline gaps, the same timing Anchor recommends for other fall home-invading pests.
Peak season
Late summer through fall, before the first hard frost
First-frost anchor
Manchester first hard frost ~Oct 19 (50%) / Oct 29 (80%), NOAA 1991-2020
Make sure it's a Roof Rat
Two quick detours worth taking — confirm the ID, then learn what drew it in so it doesn't come back.
Frequently asked
Sources & further reading(4)
- [1]CDC — Leptospirosis
Leptospirosis transmission via urine-contaminated water, soil, or food
govverified 2026-07-13 - [2]CDC — Cleaning Up After Rodents
Safe droppings cleanup and general rodent hygiene
govverified 2026-07-13 - [3]Colonial Pest Control — Rats Are Neophobic
Rat neophobia as the core reason DIY trap/bait placement underperforms
industryverified 2026-07-13 - [4]Miller the Killer — Roof Rat vs. Norway Rat
Roof rat identification and climbing/high-entry behavior
industryverified 2026-07-13
Written & reviewed by
VerifiedDaniel Brady
NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)
Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.
Last updated July 2026
Other species you can tackle
Same category — the dot shows each one's DIY verdict at a glance (green = friendly, amber = doable with care, red = call a pro).
Professional Pest Control
Roof Rat Colony Not Responding to DIY?
Neophobic rats and hard-to-reach rooflines are where DIY genuinely stalls. Anchor Pest Services handles exclusion, pre-baiting, and tamper-resistant station placement across southern and central New Hampshire. Family-owned since 2017, NH license #782664.
- Roofline exclusion + attic access
- NH-licensed applicators (#782664)
- Free inspection — same-day service across southern NH
NH License #782664 · No obligation · We answer in person