Common Roost Location
Bats in the Eaves Tampa Bay
The gap between your roofline and fascia board is one of the most common bat entry points in Florida. A colony in your eaves can number in the hundreds — and they return to the same roost every year.
Why Eaves?
Why Bats Choose Your Eaves
Eaves offer everything a bat colony needs: a narrow, protected gap that predators cannot access, proximity to the warm attic air that rises through the structure, and a south- or west-facing exposure that holds heat through the night. In Tampa Bay's climate, eave gaps stay warm year-round — making them attractive roost sites even outside the summer maternity season.
The most common entry point is the gap between the fascia board and the soffit panel. On older homes, this gap widens as wood expands and contracts through Florida's wet and dry seasons. On tile-roof homes, the gap at the first course of tile above the fascia is another prime entry point. Bats need only ⅜ of an inch to enter.
Once a colony establishes in your eaves, they leave chemical scent markers that attract other bats. Even after a successful exclusion, those scent markers remain — which is why permanent sealing of every gap is essential, not just the primary entry point.
⅜"
Minimum gap needed to enter
20–30 min
After sunset — peak exit time
Year-round
Active roost in Florida climate
Warning Signs
Signs You Have Bats in Your Eaves
Guano accumulation on siding or foundation
Bat droppings accumulate directly below the roost entry point. On eave roosts, this means guano on the siding, on window sills below the roofline, or on the foundation at the base of the wall. Fresh guano is dark and moist; older accumulations are dry and crumble easily.
Grease marks at the entry gap
Bats have oily fur. Repeated use of the same entry point leaves a dark brown or black grease stain on the fascia board, soffit edge, or roofing material around the gap. Grease marks are one of the most reliable indicators of an active entry point.
Dusk emergence activity
Bats exit to feed at dusk, typically 20–30 minutes after sunset. A colony in your eaves will produce a visible stream of bats exiting from one or two points along the roofline. Even a small colony of 20–30 bats is visible during a dusk emergence count.
Scratching or chittering sounds at dusk and dawn
Bats are most active entering and exiting the roost at dusk and dawn. Scratching, squeaking, or chittering sounds from the eave area during these times — particularly in spring and summer — are a strong indicator of a colony.
Bat odor from the roofline
A large colony produces a distinctive musky ammonia odor from accumulated guano and urine. On eave roosts, this odor is often detectable from the ground near the roofline, particularly on warm days when heat draws air through the structure.
Individual bats found inside the home
Bats roosting in eaves sometimes find their way into the living space through gaps in the soffit, around recessed lighting, or through attic access points. A bat found inside the home during summer is often a juvenile from an eave or attic colony.
Health & Structural Risks
Why Eave Colonies Cannot Be Ignored
Guano accumulation in the soffit cavity
Eave colonies deposit guano inside the soffit cavity and along the top of the fascia board. Over time this accumulation can weigh enough to bow or crack vinyl soffit panels, and the moisture and acidity accelerates rot in wood fascia and rafter tails.
Histoplasmosis risk from dried guano
Dried bat guano can harbor Histoplasma capsulatum, a fungal spore that causes histoplasmosis when inhaled. Guano accumulations in enclosed eave cavities are a documented exposure risk during any work near the roofline.
Rabies exposure from direct contact
Any bat found on the ground, acting disoriented, or accessible to people or pets should be treated as a potential rabies exposure. Do not handle bats with bare hands. If contact occurred, contact the Hillsborough County Health Department immediately.
Colony growth year over year
Bat colonies grow. A maternity colony that starts with 30 females in spring can number 60–90 by August as pups reach flight age. Colonies that are not excluded continue to return and expand each year, increasing guano accumulation and structural damage.
Seeing any of these signs along your roofline?
Free inspection — we identify every entry point, not just the obvious one.
The Exclusion Process
How We Remove Eave Colonies
Full Exterior Inspection
We inspect the entire roofline — fascia, soffit, rake boards, ridge cap, and all roof penetrations — not just the visible entry point. Eave colonies often use multiple gaps along the same roofline. Every gap larger than ½ inch is documented.
Dusk Emergence Count
We perform a dusk emergence count to identify all active exit points and estimate colony size. This step is essential — sealing secondary gaps while the primary entry is still active pushes bats to find new entry points elsewhere on the structure.
One-Way Exclusion Devices
Exclusion tubes or netting are installed at all active entry points. Bats can exit through the device but cannot re-enter. We do not seal the primary entry point until the colony has fully vacated — typically 3 to 7 nights of monitoring.
Permanent Sealing
Once the colony has vacated, exclusion devices are removed and all entry points are permanently sealed. For eave gaps, this typically involves galvanized hardware cloth, metal flashing, or exterior-grade caulk depending on the gap size and material.
Secondary Gap Sealing
All secondary gaps along the roofline are sealed on the same visit. This prevents the excluded colony from re-entering through adjacent gaps and eliminates future entry points before they are discovered by a new colony.
Written Guarantee
Every exclusion job includes a written guarantee. If bats re-enter through any point we sealed, we return and re-seal at no charge. We also provide documentation of the work performed for your property records.
Maternity Season Blackout — April 15 – August 15
Florida Statute 379.231 prohibits bat exclusion between April 15 and August 15. During this window, flightless pups are present in the roost and cannot be excluded without trapping them inside. If you discover an eave colony during the blackout, we can inspect, document, and schedule exclusion to begin August 16. Do not attempt to seal the entry point yourself — it is a wildlife violation and will trap bats inside your structure.
Why DIY Fails
Why Homeowners Can't Do This Themselves
Missing secondary entry points
Homeowners typically seal the one gap they can see — the obvious entry point. Bats use multiple gaps along the same roofline. Sealing one gap without finding the others pushes the colony to adjacent entry points within days.
Using the wrong materials
Steel wool rusts out in months. Expanding foam gets chewed through in hours. Neither material is rated for exterior bat exclusion. Professional exclusion uses galvanized hardware cloth, metal flashing, and exterior-grade caulk — materials that last 10–20 years.
Sealing during the maternity season blackout
Sealing any bat entry point between April 15 and August 15 is a violation of Florida Statute 379.231. Homeowners who seal during the blackout trap flightless pups inside, creating a far worse problem — and a potential wildlife violation fine.
No exclusion device — sealing bats inside
Sealing an active entry point without first installing a one-way exclusion device traps the colony inside the structure. Trapped bats will chew through drywall, insulation, and soffit panels to find an exit — creating far more damage than the original gap.
Common Questions
Bats in the Eaves FAQ
How do I know if the bats are in my eaves or in my attic?
Eave colonies roost in the soffit cavity and the gap between the fascia and the first course of roofing material. Attic colonies roost in the open attic space. The distinction matters for exclusion: eave colonies are typically accessed from the exterior; attic colonies may require interior inspection as well. A dusk emergence count and exterior inspection will identify the roost location.
How many bats are typically in an eave colony?
Eave colonies in Tampa Bay typically range from 20 to several hundred bats. Brazilian free-tailed bats — the most common species in the area — form maternity colonies where females congregate to give birth and raise pups. A colony that starts with 30 females in April can number 60–90 by August as pups reach flight age.
Can I seal the gap myself while I wait for an appointment?
No. Sealing an active entry point without a one-way exclusion device traps bats inside. During the maternity season (April 15 – August 15), any sealing is a wildlife violation. Outside the maternity season, do not seal without first confirming the colony has vacated. Call us — we can assess the situation and advise on next steps.
Will the bats come back after exclusion?
Not through the sealed entry points. Bats do return to the same roost site year after year — which is why permanent sealing of every gap is essential. Our written guarantee covers re-entry through any point we sealed. Bats may probe the structure for new gaps in subsequent years, which is why we recommend a visual inspection every 3–5 years.
Do you clean up the guano in the eave cavity?
Guano remediation is a separate scope from exclusion. For eave colonies, guano accumulation is typically in the soffit cavity and along the top of the fascia board. We assess accumulation during the inspection and can provide a remediation estimate. For small accumulations, remediation may not be necessary; for larger colonies or long-established roosts, cleanup and treatment are recommended.
What does eave bat exclusion cost?
Eave exclusion pricing depends on the linear footage of roofline affected, the number of entry points, and the materials required. Most residential eave exclusion jobs in Tampa Bay range from $400 to $1,500. We provide a written estimate after the free inspection — no obligation.
Bats in Your Eaves?
Free inspection. Licensed Florida wildlife agent. Written guarantee. Serving all six Tampa Bay counties.