7 Signs Rodents May Be Entering Through Garage and Attic Gaps

Rodent activity is not always obvious at first. Garages, attic edges, vents, and utility openings can provide sheltered routes into a home, especially when a small maintenance issue goes unnoticed. These seven signs can help San Francisco-area homeowners decide when a closer inspection is appropriate.

1. New gaps around garage doors

Look at the bottom corners and side seals of the garage door. Daylight, worn weather stripping, or a door that no longer sits evenly can indicate an opening that should be evaluated and repaired.

2. Rub marks or debris near wall edges

Repeated movement along the same route may leave dark smudges, disturbed dust, nesting material, or small pieces of insulation near walls and stored items. Avoid handling unknown debris without appropriate precautions.

3. Damaged vent screens

Exterior vents should be checked for loose edges, corrosion, tears, or missing fasteners. A screen can look intact from the ground while still having a lifted corner, so use a safe viewing position and do not climb without proper equipment.

4. Scratching after the house becomes quiet

Intermittent scratching, light movement, or gnawing sounds in ceilings and walls can have several causes. Record where and when the sound occurs; that information can help focus a professional inspection.

5. Changes around roofline transitions

Areas where roof sections, siding, trim, and utility lines meet deserve attention. Movement, weather, and previous repairs can create small openings over time. Inspection from the ground is safer than attempting an unsupported roof check.

6. Gnawing on stored materials

Fresh marks on cardboard, plastic containers, wood edges, or wiring covers can signal activity. Move food and pet supplies into sealed containers and avoid disturbing areas that may contain droppings or nesting material.

7. Activity that returns after trapping

When signs return, the entry route may still be open. Exclusion focuses on identifying accessible openings and correcting them as part of a broader control plan, rather than relying only on removal.

If you are seeing one or more of these conditions, visit ASAP Rodent Exclusion Pro to review available rodent-control and exclusion services for San Francisco-area properties.