Identification
| Trait | Detail |
|---|---|
| Size | Total length often near 35–45 cm including a long tail. |
| Weight | Adults frequently lighter-looking than Norway rats, roughly 150–250 g typical urban adults. |
| Colour | Brown to black above; belly grey to white. |
| Head | Pointed snout; ears large enough to cover eyes when pulled forward. |
| Tail | Longer than head plus body, uniformly dark, scaly, nearly naked. |
| Droppings | Spindle-shaped ends, about 12–14 mm, smaller than typical Norway rat scat. |
Roof rats (Rattus rattus) are the sleek, long-tailed rats often tied to ivy-covered fences, overhead wires, and attic noise in coastal BC. In Greater Vancouver they exploit fruiting trees, dense ornamental vines, and unscreened roof vents. If you find small pointed droppings on attic insulation or along overhead pipes, roof rat should stay on the list alongside other small mammals until confirmed.
Behaviour & Habits
Roof rats are agile climbers and will run branches to eaves, follow cables from pole to house, and squeeze through gaps the width of a thumb. They prefer to nest above ground when possible: soffits, attics, palm-style dense plantings against walls, and elevated sheds. Activity is mostly nocturnal, with scratching and gnawing audible through quiet ceilings.
They will use ground routes when convenient—especially along overgrown fence lines—but their advantage is vertical access. In neighbourhoods with old fruit trees and minimal roof trimming, aerial pathways can stay open even when the foundation looks tight.
Health & Property Risks
⚠ Health risk — professional removal recommended. Roof rat urine and droppings contaminate voids and stored goods; gnawing damages wiring, plastic plumbing, and stored keepsakes.
Like other commensal rodents, roof rats can be associated with pathogens found in urine and droppings; risk increases where HVAC moves dust from infested attics or where people handle soiled storage without PPE. Property risks include insulation displacement, gnawed coax or electrical wiring, and stained ceiling tiles from heavy attic use.
Prevention
- Keep branches and vines at least a metre clear of rooflines and gutters where practical.
- Screen roof and gable vents with rodent-grade mesh after measuring openings.
- Pick ripe fruit and clean fallen fruit under trees against the house.
- Route power lines away from touching roof edges when an electrician can do so safely.
- Declutter attic storage so runways and droppings stay visible at inspection.
- Maintain ivy and bamboo screens so they do not form continuous bridges to soffits.
How We Treat Roof Rats
We prioritize roofline inspection: soffit returns, vent stacks, cable penetrations, and overlapping tree limbs. Trapping may run in attics or voids while exterior one-way or exclusion work closes the routes they are using. Because roof rats re-test old chew sites, follow-up includes listening visits and photo checks of metal closures.
For active roof rat work tied to your structure, see our rat control service for Greater Vancouver and book an inspection so aerial entries are mapped before materials are ordered.
Frequently Asked Questions Q: Are roof rats only in attics?
A: They prefer elevated nests but will use crawl spaces or wall voids if that is the easiest warm route.
Q: Why are they louder than mice?
A: Larger animals moving on drywall and dragging nesting material create more noticeable noise, especially at night.
Q: Do they chew spray foam?
A: Yes; foam alone is not a chew stop. Metal mesh or plate closures sized to the opening are part of durable fixes.
Q: Can they use sewer lines like Norway rats?
A: Patterns differ by site; inspection determines whether utility corridors or rooflines are the active highway.
Professional Rat Control
Roof Rat problems in Greater Vancouver require a systematic approach — inspection of the full property, elimination of the root cause, and documented follow-up. Our rat control service covers all of this.
View Rat Control