Sound

1. Running or Scratching Overhead, Dusk to About 2am

This is the one almost everybody notices first. Roof rats are nocturnal and they use established runways, so what you hear is light, fast and repetitive along the same route night after night. The window is roughly dusk to two in the morning, with a second smaller burst before dawn.

Weight and rhythm are the useful diagnostics. A roof rat is light and quick. A squirrel is heavier and active in daylight. A raccoon is unmistakably heavy, slow and deliberate, and you often hear individual footfalls rather than scurrying. If you are hearing something that sounds like a voice rather than movement, that is not a rodent at all.

Droppings

2. Black, Banana Shaped Droppings a Quarter to Half an Inch Long

Roof rat droppings are dark, curved and pointed at the ends, and you will find them concentrated along runways rather than scattered evenly. Common places are the attic on top of ductwork, along baseboards, in the garage, and behind stored items.

Do not vacuum or sweep them. Disturbing dried droppings puts contaminated dust into the air. They will still be there tomorrow when somebody with proper respiratory protection can deal with them safely.

Rub Marks

3. Greasy Rub Marks Where They Squeeze Through

Rodents have oily fur and they use the same opening repeatedly, so a gap in regular use develops a dark smudge around it. This is frequently how an entry point actually gets located, because the mark tells you the opening is active rather than historic.

Smell

4. A Musky Ammonia Odour That Builds Over Weeks

Urine accumulates and the smell strengthens as the population grows. A sharper decomposition smell means something has died inside, which is a different and more urgent problem, and it is the most common reason people call in the first week rather than the third month.

Daylight

5. Daylight Visible Through Gaps at the Eave

This is the single most useful check you can do yourself and it costs nothing. Go into the attic during daylight with the lights off, let your eyes adjust for a minute, and look toward the eaves. Any daylight you can see is an opening large enough to matter. Roof rats need only about half an inch, roughly the diameter of a quarter.

Damage

6. Chewed Wiring, Flattened Insulation and Nesting Material

Rodent incisors grow continuously and they gnaw constantly to keep them filed, which is why wiring, PVC and PEX plumbing lines, low voltage cabling and flex duct all get chewed regardless of whether they are food. Insulation gets flattened into nesting beds and shredded material collects in corners.

Chewed wiring is the one that matters beyond the immediate repair. Damaged insulation exposes conductors, which is a genuine fire risk, and it is also what can surface during a Florida 4 point inspection and complicate an insurance renewal.

Timing

7. Activity During Daylight Hours

If you are hearing or seeing rodents during the day, act on it. Daytime activity generally means the colony has grown large enough that animals are foraging outside normal hours, which usually correlates with significant attic contamination already in place.

What Next

What To Do Once You Have Confirmed It

1. Do not put down poison. A poisoned rat dies inside your wall rather than outside, which turns a rodent job into an odour and decontamination job.
2. Do not seal anything yet. Sealing a house with rats still inside means they chew new openings to get out, or they die in the wall voids.
3. Do not vacuum droppings. Wait for somebody with proper protection and HEPA filtration.
4. Get the roofline surveyed from a ladder. Most Florida entries are at the soffit, the tile ends or a mechanical penetration, and none of them are visible from the ground.
5. Ask for the entry point count and photographs. That is what tells you whether a quote is thorough or a guess.

Keep Reading

Related Guides and Services

• Free Rodent Inspection — full roofline and attic survey, every opening photographed
• Rat Removal — roof rats and Norway rats, and why they need different work
• Rodent Exclusion — the step that actually ends it
• Roof Rat vs Norway Rat — how to tell which one you have