Rodent Exclusion for Vents and Weep Holes

Mechanical
Effectiveness:
Cost Level
Medium
Environmental Impact
Low
Resistance Risk
Low
Target Pests
3 species

Target Pests (3)

Common NameScientific NameCategory
House MouseMus musculusRodents
Norway RatRattus norvegicusRodents
Roof RatRattus rattusRodents

Application Method

Install exclusion devices on foundation vents, gable vents, roof vents, dryer vents, and weep holes to prevent rodent entry while maintaining proper ventilation and drainage. For foundation vents: install 1/4 inch hardware cloth over vent openings, securing with screws or construction adhesive. For dryer vents: install flapper-style dryer vent covers that close when dryer not operating. For roof and gable vents: secure with 1/4 inch hardware cloth on interior or exterior. For weep holes: install weep hole screens that allow water drainage but prevent entry. For larger openings: use copper wool or stainless steel mesh stuffed into gaps before covering with hardware cloth. Never use steel wool as it rusts. Ensure vents continue to function properly after exclusion materials installed - ventilation is necessary to prevent moisture damage.

Timing

Install as part of comprehensive rodent exclusion program. Prioritize during initial service when rodent activity observed.

Frequency

One-time installation. Inspect quarterly during service visits to verify exclusion materials remain intact and functional. Repair or replace damaged materials as needed.

Preparation Required

Inspect all vents and weep holes to identify those needing exclusion. Measure openings to determine amount of materials needed. Have tools ready (tin snips, screws, drill, stapler). Purchase appropriate hardware cloth and screens.

Follow-up Required

Verify proper ventilation maintained. Monitor for rodent activity to confirm exclusion successful. Inspect exclusion materials quarterly for damage. Repair immediately if damage found. Continue monitoring with traps and bait stations.

Safety Precautions

  • Ensure vents maintain proper air flow and drainage after exclusion
  • Use ladder safely when accessing roof and gable vents
  • Wear gloves when handling hardware cloth (sharp edges)
  • Do not completely seal vents - must maintain function
  • Check for rodents inside before sealing
Important Disclaimer: The information provided in this knowledge base is for educational and reference purposes only. Pest management professionals should always consult current product labels, Safety Data Sheets (SDS), manufacturer instructions, and applicable local, state, and federal regulations as the definitive source of truth. Product formulations, application methods, safety requirements, and regulations may change over time. This information may be out of date and should not replace professional judgment, proper training, or required licensing and certifications.