Rats in the attic are one of the most common calls we get from East Bay homeowners. The activity often goes on for weeks before anyone realizes what is happening. Here are the signs to watch for, and what to do about them.
Scratching or scurrying sounds at night
Rats are nocturnal. If you hear scratching, scurrying, or rolling sounds in the ceiling after the house has gone quiet, that is often the first sign. Sounds tend to travel: the noise may be in one part of the attic even if you hear it from a bedroom on the other side.
Droppings in the attic or garage
Rat droppings look like dark, tapered pellets about the size of a raisin. You often see them near attic access, along framing, or in the garage. Do not disturb droppings without protection. Schedule an inspection first.
Chew marks on wood, wiring, or vents
Rats need to gnaw constantly. Look for chew marks on wood framing around vents, on plastic components, or on wiring insulation. Chewed wiring is a fire risk.
Grease marks along framing or beams
Rats travel the same runways repeatedly and leave dark grease marks along the surfaces they rub against. Grease marks along an attic beam or wall stud are a strong sign of an active runway.
Visible entry points on the exterior
The most reliable evidence is finding the entry point. Common spots: gable vents, roof-to-wall transitions, dormer joints, and eaves. Sealing these is the difference between a temporary fix and a permanent one.
