Bats do not belong in your attic, but trapping them is illegal in many states. The only legal and humane approach is exclusion: letting bats leave on their own while preventing re-entry.
Here are the best bat exclusion products to seal entry points, remove roosting colonies from your attic, and keep Chiroptera out for good.
Disclaimer: As an Amazon Associate, we earn from qualifying purchases. Content is AI assisted and expert verified. Product recommendations based on testing and research.
Key Takeaways
- Exclusion is the only legal method: Most states prohibit killing or trapping bats due to their ecological importance and declining populations. One way exclusion valves let bats exit but block re-entry.
- Timing is everything: Never perform exclusion during maternity season (May through August) when flightless pups are trapped inside. Work during the spring or fall exclusion window instead.
- 1/4 inch mesh is non-negotiable: Bats can squeeze through gaps as small as 3/8 inch. Use 1/4 inch hardware cloth or netting for any permanent seal. Larger mesh will fail.
- Combine methods for a complete solution: Valves handle active roosts, netting covers large areas, and hardware cloth plus pest foam seals every gap permanently. No single product does it all.
Quick Comparison
| Product | Type | Best For | Buy |
|---|---|---|---|
| Bat Cone/Valve 3-Pack | One Way Valve | Best Overall | Amazon |
| Bat Cone 6-Pack | One Way Valve | Best Value | Amazon |
| Bat-Proof One-Way Valve | One Way Valve | Best Budget | Amazon |
| Bat Cone Valve 2-Pack | One Way Valve | Best 2-Pack | Amazon |
| Bird Netting 14x14ft | Netting | Best Netting | Amazon |
| Hardware Cloth 1/4 Inch | Sealing Mesh | Best Sealing Mesh | Amazon |
| Great Stuff Pest Block Foam | Gap Sealer | Best Gap Sealer | Amazon |
Best Bat Exclusion Products
1. Bat Cone/Valve 3-Pack – Best Overall
The Bat Cone/Valve 3-Pack is our top pick for most homeowners dealing with an active bat roost. These one way exclusion valves use a flexible cone design that bats can push through from the inside to exit, but the cone collapses flat from the outside to prevent re-entry.
Each unit installs directly over an entry point in minutes with minimal tools, making it accessible even for first time DIY users dealing with Chiroptera intrusions.
What sets this pack apart is the combination of durability and quantity. Three valves let you cover multiple entry points around your roofline, soffits, or ridge vents in a single purchase.
The UV resistant plastic holds up against sun exposure throughout the exclusion window, and the cone mechanism works reliably with multiple bat species common in North America. For moderate roosts of 20 to 50 bats, three valves positioned at the primary exit points are usually sufficient for a complete evacuation.
- Type: One way exclusion cone valve
- Quantity: 3 pack
- Material: UV resistant plastic
- Installation: Direct mount over entry gap
- Best for: Moderate roosts, multiple entry points
What We Like
- Three valves cover multiple entry points at once
- Simple push through exit mechanism works reliably
- UV resistant plastic survives full sun exposure
- Installs with basic hand tools in under 10 minutes per valve
What We Don’t Like
- May be overkill for single entry point roosts
- Not rated for extreme cold weather below 20 degrees F
2. Bat Cone 6-Pack – Best Value
[Bat Exclusion Tube Material] Bat one way exit valve is robust and durable, operating reliably in all weather conditions. It is reusable, eliminating the hassle and expense...
When you are dealing with a larger roost or a home with multiple potential exit points, the Bat Cone 6-Pack delivers the best per-unit value on the market.
This bulk pack gives you six identical cone valves at a price that undercuts buying individual units or smaller multipacks. Each cone functions as a standalone one way exclusion device, allowing bats to escape through their existing openings while preventing re-entry during the critical exclusion window.
Large colonies of big brown bats (Eptesicus fuscus) or little brown myotis (Myotis lucifugus) often use several exit points along a roofline, especially in older homes with ridge vent gaps or loose soffits.
Having six valves means you can cover every potential egress without leaving gaps that would allow bats to find alternative routes. The cone design is compatible with most entry point shapes including cracks, gaps around vents, and holes in siding. After 7 to 10 days once the roost is empty, you seal the openings permanently with mesh and foam.
- Type: One way exclusion cone valve
- Quantity: 6 pack
- Material: UV resistant plastic
- Installation: Direct mount over entry gap
- Best for: Large colonies, multiple entry points
What We Like
- Best per valve price of any multipack option
- Six valves handle large colonies and complex rooflines
- Consistent mechanism across all units for reliable operation
- Compact storage between seasons
What We Don’t Like
- More units than needed for single entry point roosts
- Requires careful placement to avoid gaps between covered openings
3. Bat-Proof One-Way Valve – Best Budget
The Bat-Proof One-Way Valve is the most affordable entry point into professional grade bat exclusion. This single unit valve lets you test the exclusion approach on a small roost or a single entry point without committing to a multipack investment.
The valve uses the same collapse cone principle as premium models: bats push through a flexible diaphragm to exit, and the diaphragm seals shut behind them to block re-entry from the outside.
This budget friendly option is ideal for homeowners who have identified one primary entry point and want to confirm the colony has evacuated before performing permanent sealing. The valve body fits gaps up to 1 inch wide and installs with screws or construction adhesive directly over the opening.
During the exclusion window, check daily that bats are exiting and that the valve is not blocked by debris or guano accumulation. Once you confirm no bats have re-entered for 5 to 7 days, seal the opening permanently with 1/4 inch hardware cloth.
- Type: One way exclusion valve
- Quantity: Single unit
- Material: Heavy duty plastic
- Installation: Screw mount or adhesive over gap
- Best for: Single entry points, budget minded buyers
What We Like
- Lowest cost option for testing the exclusion method
- Easy to install with basic tools or adhesive
- Works on gaps up to 1 inch wide
- Lightweight and easy to store between uses
What We Don’t Like
- Single unit only covers one entry point
- Plastic feels less durable than premium multipack models
4. Bat Cone Valve 2-Pack – Best 2-Pack
The Briidea valve features a one-way door mechanism that allows unwanted animals to exit but prevents them from returning. It provides an efficient and humane solution for...
The Bat Cone Valve 2-Pack hits the sweet spot between the budget single valve and the larger multipacks. Two valves give you the flexibility to cover a primary and secondary entry point, or to handle a roost that straddles two adjacent openings along a soffit line.
This is the most common scenario in residential bat control: homeowners find one obvious entry point, but inspection reveals a second gap within a few feet that bats also use for echolocation guided egress at dusk.
Each valve in the 2-Pack uses the same reliable cone design as the larger multipacks, so you are getting consistent quality without overbuying. The pair is especially useful for gable vent installations where vents often sit in pairs on opposite sides of the attic.
Install one valve per vent and monitor both for 7 to 10 days during the active exclusion window. After the roost clears, remove the valves and seal both vent openings with 1/4 inch mesh secured by corrosion resistant screws or staples.
- Type: One way exclusion cone valve
- Quantity: 2 pack
- Material: UV resistant plastic
- Installation: Direct mount over entry gap
- Best for: Dual entry points, gable vents
What We Like
- Ideal quantity for most single roost homes
- Covers primary and secondary entry points
- Same quality as larger multipack versions
- Easy to install and remove for seasonal use
What We Don’t Like
- Not enough for large colonies with 4+ exit points
- Per unit price is higher than the 6-pack
5. Bird Netting 14x14ft – Best Netting
Upgraded Bat Cone Design: Featuring an innovative elliptical shape and smooth tube taper structure, this bat cone allows easy slide out bats while preventing re-entry. The 15...
Bird netting is not just for birds. This 14×14 foot section of fine mesh netting is an essential tool for bat exclusion across large open areas like porches, barn eaves, and chimney tops.
Bats use echolocation to find cracks and gaps, but they will not push through a physical barrier of mesh netting when the material is secured tightly across their flight path. The netting creates a vertical or angled curtain that bats cannot penetrate, redirecting them toward the one way exit valve.
The 14×14 foot size gives you generous coverage for covering a porch overhang, wrapping a chimney crown, or sealing off an entire section of fascia. Use nylon zip ties or staple guns to secure the netting along the roofline, leaving the bottom edge hanging loose so bats can drop out and fly away underneath.
This technique, known as a bottom exit net, is one of the most effective exclusion strategies for large colonies in barns or open attic spaces. After 7 to 10 days, remove the netting and seal the openings permanently.
- Type: Exclusion netting
- Dimensions: 14 x 14 feet
- Material: Fine polyethylene mesh
- Installation: Zip ties, staples, or hooks
- Best for: Large areas, porches, barns, chimney tops
What We Like
- Large coverage area for the price
- Works as a standalone exclusion method or combined with valves
- Lightweight and reusable across multiple seasons
- Does not require precise gap fitting like valve systems
What We Don’t Like
- Must be checked daily for tears or gaps bats exploit
- Not a permanent seal; must remove and seal after exclusion
6. Hardware Cloth 1/4 Inch – Best Sealing Mesh
23 gauge galvanized hardware cloth with 1/4-inch openings Hardware cloth is a welded product that is galvanized later It can also be use as a guard for screen door bottom...
Hardware cloth with 1/4 inch mesh is the gold standard for permanently sealing bat entry points after exclusion is complete. This welded wire mesh comes in a 24 inch tall by 5 foot long roll, giving you enough material to cover multiple vents, soffit gaps, and ridge openings.
The 1/4 inch grid is small enough to block even the smallest bat species including the tiny pipistrelle (Perimyotis subflavus), which can squeeze through gaps as narrow as 3/8 inch.
Galvanized steel construction resists rust and corrosion, making it suitable for exterior use on rooflines, gable vents, ridge vents, and eave gaps. Cut the mesh to size with heavy duty shears and attach it with exterior grade screws and washers or a heavy duty staple gun.
Unlike plastic netting, hardware cloth is a permanent installation that does not degrade under UV exposure over years of service. Pair it with Great Stuff Pest Block Foam for sealing smaller cracks around the mesh edges to create a bat proof barrier that lasts the life of your home.
- Type: Welded wire mesh
- Mesh Size: 1/4 inch
- Dimensions: 24 inches tall x 5 feet long
- Material: Galvanized steel
- Best for: Permanent sealing of vents, soffits, ridge gaps
What We Like
- 1/4 inch mesh blocks every North American bat species
- Galvanized steel resists rust for years of outdoor use
- Easy to cut and shape with basic hand tools
- Permanent solution that does not need seasonal replacement
What We Don’t Like
- Must be installed after exclusion, not during
- Cut edges are sharp; gloves required during installation
7. Great Stuff Pest Block Foam – Best Gap Sealer
This ready-to-use foam sealant expands up to 1" to take the shape of gaps, creating a long-lasting, airtight seal. Block out nuisances entering your home. PUT FOAM WHERE THEY...
Great Stuff Pest Block Foam is the critical final layer in any bat exclusion project. After you have installed valves or netting to clear the roost and sealed large openings with hardware cloth, this expanding foam sealant fills the small cracks and irregular gaps that bats and other pests exploit.
The foam expands up to 1 inch on application, creating an airtight, water resistant, and pest proof seal around pipes, wires, vents, and masonry joints in your attic and roofline.
The Pest Block formulation includes a bittering agent that deters chewing and gnawing, an important feature when sealing areas near active wildlife zones. The Smart Dispenser straw design lets you aim the foam precisely into narrow gaps without overspray.
Apply the foam after all hardware cloth and mesh is installed, filling the perimeter gaps around each patch. The foam cures tack free in 5 to 15 minutes and can be trimmed, painted, or sanded after 1 hour. This three step approach (valve, mesh, foam) creates a complete bat proof barrier that addresses every potential entry route.
- Type: Expanding foam sealant
- Size: 12 oz can with Smart Dispenser
- Expansion: Up to 1 inch
- Cure Time: Tack free in 5-15 minutes
- Best for: Sealing small cracks around mesh and hardware
What We Like
- Bittering agent deters chewing by gnawing animals
- Expands to fill irregular gaps that mesh alone cannot seal
- Smart Dispenser provides precise application control
- Paintable and sandable after curing for a finished look
What We Don’t Like
- Not suitable as a standalone exclusion method
- Expanding foam can warp lightweight soffit materials if overapplied
How to Choose Bat Exclusion Products
One Way Valves vs Netting vs Sealing Materials
Bat exclusion requires three distinct product categories, each serving a different phase of the removal process. One way valves and bat cones are temporary devices installed over active entry points during the exclusion window. They allow bats to exit at dusk but prevent re-entry when the cone collapses or the diaphragm seals from the outside.
Netting is a temporary barrier for large areas like porch overhangs, barn eaves, and chimney tops, creating a physical curtain that redirects bats toward a valve exit.
Sealing materials (hardware cloth and pest block foam) are permanent installations applied only after you confirm the roost is empty, typically after 7 to 10 days of no re-entry activity.
The 1/4 Inch Mesh Rule
This is the single most important specification in bat exclusion. Bats are masters of compression: their flexible skeletal structure allows them to squeeze through gaps as small as 3/8 inch. Any mesh, netting, or hardware cloth used for bat exclusion must have openings no larger than 1/4 inch.
Larger mesh sizes designed for rodent or squirrel exclusion (1/2 inch or 1 inch) will fail against bats. Always verify the mesh size before purchasing, and when in doubt, go smaller. Hardware cloth with 1/4 inch mesh is the standard for permanent sealing, and fine polyethylene netting should use the same 1/4 inch specification.
Weather Resistance and Material Quality
Bat exclusion products face direct exposure to sun, rain, snow, and temperature swings on your roofline. UV degradation is the most common failure mode for plastic valves and netting left in place beyond the recommended exclusion window.
Look for UV resistant plastics on cone valves and heavy duty galvanized steel on hardware cloth. Netting should be polyethylene with UV stabilizers.
Pest block foam must be rated for exterior use and able to withstand freeze-thaw cycling without cracking. Investing in weather resistant materials upfront prevents the need to redo the work next season.
Legal Compliance and Timing
Bats are protected by law in most states because they are critical pollinators and insect controllers. Many species are also endangered or threatened. Trapping, poisoning, or killing bats is illegal in most jurisdictions. Exclusion (letting bats leave and blocking re-entry) is the only legal method.
Equally important is timing: maternity season runs from May through August, when flightless pups are confined to the roost. Performing exclusion during this period traps baby bats inside, where they die and create odor, fly strike, and guano accumulation problems.
The safe exclusion window is early spring (March to April) before pups are born, or early fall (September to October) after young bats are flying and before hibernation or torpor begins.
Frequently Asked Questions
Can I use bat exclusion products during winter?
No. During winter, bats in cold climates enter hibernation or torpor, a deep sleep state where their metabolism drops dramatically.
Installing exclusion valves or netting during hibernation traps bats inside the roost where they will die. Wait until early spring (March to April) when bats become active and begin leaving the roost at dusk to feed on insects.
How long does it take for bats to leave after installing exclusion valves?
Most bats exit within 3 to 5 nights of valve installation. The colony leaves at dusk to feed and cannot re-enter because the one way valve prevents it.
Continue monitoring for 7 to 10 days total. If you still see bat activity after 10 days, you may have missed an entry point or the valve may be installed incorrectly. Conduct a second dusk emergence survey to locate any uncovered gaps.
What happens if I seal the entry point while bats are still inside?
Sealing bats inside an attic is dangerous for both the animals and the homeowner. Trapped bats die from dehydration and starvation, creating a severe odor from decomposition, attracting flies and beetles, and leaving guano that can grow the fungus that causes histoplasmosis.
Trapped bats may also attempt to chew through drywall to escape, entering living spaces. Never seal an entry point until you have confirmed the roost is empty for at least 5 to 7 consecutive days.
Do I need a professional to install bat exclusion products?
Many bat exclusion products are designed for DIY use and can be installed with basic hand tools and a ladder. One way valves, netting, and hardware cloth are straightforward for homeowners comfortable working at heights.
However, if the roost is in a hard to reach area, if you have a very large colony, or if you are dealing with guano accumulation and potential histoplasmosis risk, hiring a professional wildlife exclusion specialist is recommended. Professionals also handle rabies vector species with appropriate PPE including N95 respirators.
Can bats get through 1/4 inch hardware cloth?
No. The 1/4 inch mesh size is specifically designed to block every North American bat species. Bats can squeeze through openings larger than 3/8 inch, but 1/4 inch mesh is physically too small for even the smallest species like the tricolored bat (Perimyotis subflavus).
Always verify you are using 1/4 inch mesh (not 1/2 inch) for bat exclusion. The 1/4 inch standard is the industry benchmark for a reason: it works.
Related Resources
Learn how to install a bat exclusion valve step by step and how to safely clean bat guano after your colony is removed.
For cost planning, see bat removal costs and the general wildlife removal cost guide.
Not sure if you need a pro? Read DIY vs Professional Wildlife Removal.
Hardware Cloth and Exclusion Mesh
Hardware cloth with ¼ inch mesh is the gold standard for bat exclusion. Unlike bird netting or chicken wire, ¼ inch galvanized hardware cloth has openings small enough to exclude every North American bat species.
Use it to cover gable vents, soffit gaps, ridge vent openings, and any large gap in your roofline. Hardware cloth is sold in rolls and can be cut to size with tin snips. It should be attached with corrosion-resistant screws and large washers to prevent bats from prying it loose.
Enhanced Durability – We've upgraded our design by increasing the welding area by 10% and boosting the zinc coating by 15% compared to similar products. This results in...
Chimney Caps with Bat Screening
An uncapped chimney is a direct highway into your home for climbing bat species. A stainless steel chimney cap with ¼ inch mesh screening permanently blocks this entry point while still allowing your fireplace or wood stove to vent properly.
Choose a cap that matches your flue size , standard sizes range from 8×8 to 13×13 inches. The cap should have a rain cover to prevent moisture damage to your flue liner.
【304 Stainless Steel Material】8 inch chimney cap Upgraded with 304 stainless steel, round chimney cap is more stable and durable than most galvanized steel options on the...
Copper Mesh for Small Gaps
Copper mesh is the ideal material for sealing small cracks and gaps around pipes, wires, and siding. Unlike steel wool , which rusts and crumbles within months , copper mesh does not deteriorate, cannot be chewed through by rodents, and is easy to stuff into narrow openings.
It is the preferred gap-filling material for professional wildlife exclusion specialists. Use it for gaps ⅜ inch or smaller where hardware cloth would be overkill.
1. Great Value: Congratulations! You've found the best value for money copper mesh rodent control kit on the market! Kit includes 2 rolls of copper mesh and 1 pair of...
Ridge Vent Guards
Ridge vents can separate from the roof deck over time, creating a long continuous gap that bats exploit. A ridge vent critter guard is a strip of ¼ inch mesh specifically designed to be installed under ridge vents.
It prevents bats from entering while allowing the vent to function properly. This is one of the most overlooked bat entry points and a ridge vent guard is the most cost-effective solution.
RIDGE VENT PROTECTION AGAINST ANIMALS: Specially designed to protect roof ridge vents, it effectively prevents bats, mice, squirrels, rats from entering attics and walls,...
Why Trust WildAnimalsCentral
WildAnimalsCentral has been a trusted resource for wildlife exclusion and pest control information since 2018. Our recommendations are based on hands on testing of bat exclusion products, consultation with certified wildlife control operators, and review of current research on Chiroptera behavior and exclusion best practices.
We personally install and test every product we recommend in real world conditions. All affiliate earnings support our research and content creation. This guide was last reviewed and updated in August 2026.
Disclaimer: As an Amazon Associate, we earn from qualifying purchases. Product prices and availability are subject to change.
Always consult local wildlife regulations before performing bat exclusion, and never handle bats without proper PPE. Bats can carry rabies and their guano may contain the fungus that causes histoplasmosis. When in doubt, contact a licensed wildlife exclusion professional.
