Rodent control · 10–15 min

How to seal common rodent entry points

San Diego County Vector Control says trapping is only part of the work: seal gaps, remove food, and keep vegetation off the roof line. CDC and UC IPM both treat exclusion as the lasting control. Check what you can see from the ground first.

A close-up of a hand sealing a foundation gap with steel mesh and exterior caulk on a stucco San Diego home

What you'll learn

  • Where CDC and County Vector Control say to look for gaps, from the foundation and utility lines to vents and the roof line
  • Why steel wool or hardware cloth plus a sealant beats foam or caulk used alone (UC IPM: rats chew through foam, plastic, wood, and caulk)
  • That roof rats are strong climbers and often use upper-story and roof access, according to UC IPM
  • How to check dryer-vent flaps, garage door gaps, and other ground-reachable openings without climbing the roof

Step by step

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Safety note

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