Utah Bat-Proofing Checklist: 15 Entry Points to Inspect on Your Home

Preventing bats starts with knowing where to look. Bats squeeze through openings as small as ¼ inch. This checklist covers the 15 most common bat entry points on Utah homes, ranked by frequency.

The 15 Entry Points

1. Gable vents — corroded screens pull away from frames after 20–30 years. Check all edges.
2. Ridge cap gaps — gap opens between cap and roofing material. Check full ridge line.
3. Fascia board separations — wood shrinks in Utah’s dry climate. Check fascia-to-soffit junction.
4. Soffit-to-wall junctions — separation is very common. Look for daylight at this line.
5. Chimney-to-roofline gaps — check flashing on all four chimney sides.
6. Chimney cap screens — mesh rusts and holes develop. Check for gaps >¼ inch.
7. Utility penetrations — every electrical/HVAC/cable line entry. Is the gap filled?
8. Dryer vents — flap stuck open or frame gaps. Check cover integrity.
9. Roof turbines and power vents — base flashing gaps develop as sealants age.
10. Dormer junctions — inspect all four junction points on every dormer.
11. Brick mortar gaps — especially roofline courses, window perimeters (pre-1960 homes).
12. Stucco cracks (southern Utah) — any crack >¼ inch, especially at expansion joints.
13. Weep screed gaps (stucco) — the drainage gap at stucco wall base. Check integrity.
14. Window/door frame perimeters — gaps at upper-story frames visible from attic.
15. Foundation-to-wall transitions — inspect full perimeter at this junction.

What to Do With What You Find

No bat evidence: Seal proactively with appropriate materials before May 1 or after August 15.
Evidence of bat use (staining, droppings): Call a licensed professional — do not seal without exclusion devices. (801) 675-8829

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