How to Seal and Repair Your Home After Bat Exclusion

Once bats have safely left your home, sealing their entry points and repairing damage is crucial for preventing their return and protecting your property.

By Garret Merkley · Explainer · Jul 23, 2026

Branched from How to Build and Install Custom Bat Exclusion Netting Flaps

Quick take

After bats are excluded, immediately seal all entry points to prevent their re-entry.
Use durable, weather-resistant materials like caulk, mesh, and flashing for lasting repairs.
Address guano cleanup and insulation replacement for health and structural integrity.
Regular inspections are key to ensure long-term bat-proofing and prevent future issues.

Sealing and repairing your home after bat exclusion is the critical final step in resolving a bat infestation. This process involves permanently closing all openings bats used to enter and exit your home, along with repairing any damage they caused, after they have been safely guided out. Its purpose is to ensure bats cannot return and to protect your property from further deterioration and health risks.

Identifying and Sealing Entry Points

Before any repairs begin, a meticulous inspection is essential to find every potential entry point. Bats can squeeze through surprisingly small gaps—often as little as 3/8 inch (about the width of your pinky finger). Common areas include gaps under eaves, around utility lines, chimney flashing, loose siding, and attic vents. Once identified, these openings must be sealed with durable, weather-resistant materials designed to last.

**Silicone caulk:** Ideal for small cracks, seams, and gaps around windows or trim. Choose a high-quality, exterior-grade product.
**Hardware cloth:** A sturdy, galvanized steel mesh (1/4 inch is recommended) used to cover larger openings like vents, soffit gaps, or chimney tops. It's too strong for bats to chew through.
**Sheet metal or flashing:** Suitable for larger structural gaps, especially around rooflines, dormers, or where different materials meet.
**Mortar or cement:** For repairing cracks in foundations or brickwork.
**Wood or composite boards:** For replacing rotted fascia, soffit, or other damaged structural elements.

Repairing Bat-Related Damage

Bats, particularly their droppings (guano) and urine, can cause significant damage over time. Guano accumulation in attics or wall voids can compact insulation, create strong odors, and even compromise structural wood due to its corrosive nature. Addressing this damage is crucial for both the integrity of your home and the health of its occupants. Proper cleanup and repair often involve several steps:

**Guano and urine removal:** All contaminated guano must be safely removed. This often requires specialized equipment and precautions, as guano can harbor harmful pathogens.
**Contaminated insulation replacement:** Insulation that has been compacted or soiled by guano and urine typically needs to be removed and replaced.
**Cleaning and sanitizing:** Affected surfaces (wood, drywall, concrete) must be thoroughly cleaned and sanitized to eliminate odors and potential health hazards.
**Structural repairs:** Any wood or other materials compromised by moisture, guano, or urine corrosion should be repaired or replaced to maintain structural integrity.
**Odor neutralization:** Professional treatments may be needed to fully neutralize lingering odors, especially in confined spaces like attics.

Sealing and repairing your home after bat exclusion is not just about keeping bats out; it's essential for protecting your property value, maintaining indoor air quality, and preventing costly future repairs. Bat guano can harbor harmful fungi (Histoplasma capsulatum) that cause respiratory illness, making proper cleanup vital. This process applies immediately after a successful bat exclusion, ensuring a permanent solution to a bat infestation and safeguarding your home and health for the long term.

Can I just seal the entry points without professional help?

While small sealing jobs might be a DIY task, a professional bat exclusion specialist is highly recommended. They are trained to identify all entry points, confirm bats are truly gone before sealing, and safely handle guano cleanup. Sealing too early can trap bats inside, causing them to die or find new ways into your living spaces.

How long does the sealing and repair process typically take?

The timeline varies greatly depending on the size of your home, the extent of the infestation, and the damage. Sealing entry points might take a day or two, while extensive guano removal, insulation replacement, and structural repairs could take several days to a week or more.

What materials are best for permanent bat proofing?

Durable, weather-resistant materials are key for long-term bat proofing. Good choices include high-quality silicone caulk, 1/4 inch galvanized hardware cloth or mesh, sheet metal, and sturdy wood or composite boards for structural repairs. Avoid using materials bats can easily chew through, such as standard window screening or thin plastic.

What if I find bats again after sealing and repairs?

If bats return after sealing, it indicates either not all entry points were found and sealed, or new ones have been created due to shifting structures or unnoticed damage. Re-inspect your home thoroughly, focusing on less obvious areas. If the problem persists, it's best to consult a professional to re-evaluate and ensure complete bat-proofing.

Sources

Centers for Disease Control and Prevention (CDC)
Bat Conservation International (BCI)