How One-Way Doors Help with Humane Bat Exclusion in Iowa
Bat exclusion involves safely and humanely removing bats from a building and, just as importantly, preventing them from returning. It’s a respectful, eco-conscious approach that protects both your property and Iowa’s local bat populations.
Bat exclusion can typically be performed easily for about 10 months out of the year. However, June and July are restricted months, as regulated by the Iowa Department of Natural Resources (DNR). That’s because baby bats, or pups, can’t fly yet. If their mother is sealed out of the attic or walls where she’s roosting, the young won’t survive. Since many of Iowa’s bat species are threatened or declining in numbers, these seasonal protections are critical to helping their populations recover.
If you do have an emergency, like a bat inside your living space during this time, let us know right away. You don’t have to live with bats flying around your bedroom. If they’re not in your living areas, we can still perform a full inspection, provide a quote, and schedule you for exclusion work once the DNR-approved window opens again.
Why We Use One-Way Doors
Bats use echolocation to navigate. When they attempt to return through the tube, the mesh creates a confusing wall of signals rather than a clear opening.
At the same time, airflow and scent cues from the attic disappear. Without those cues, bats can’t locate the entry point they used before.
The result is simple: bats can leave, but they can’t get back in.
Let’s clear up a few things.
A proper one-way bat tube, also called a check valve or exclusion door, doesn’t have a flap that closes behind the bat. The devices we use are made from ¼-inch hardware cloth, formed into a narrow tube about a foot long. It’s not high-tech, but it works. Here’s why:
Bats rely on echolocation to navigate, but when they try to return through the tube, the mesh appears like a wall of static. There’s no clear opening to fly through.
With no airflow or scent cues coming from the attic anymore, the bat simply can’t find its way back in.
Not being able to find their way back into your home safely keeps them out of your home and helps to ‘nudge’ them along to roost elsewhere.
Want to see it in action?
The first video shows a bat exiting through a one-way door installed beneath a soffit along the roofline. In the second video, you’ll see a bat attempt to return but fail to find its way back through the exclusion device. You’ll also notice a few bats bumping into the camera as they leave. That’s exactly what we want to see, they exit safely and continue on their way, but they don’t regain access to the structure.
https://www.youtube.com/watch?v=c0XFmv61_Cg
https://www.youtube.com/watch?v=z3D9BZL1OTc
Some companies use smooth PVC or sheet-metal tubes instead. Those systems can work, but only when installers position them perfectly vertical. They also create additional challenges. If crews leave them in place too long or reuse them repeatedly, the smooth surfaces wear down. Once that happens, bats can often climb back into the structure, defeating the entire purpose of the exclusion. We’ve seen it happen firsthand.
We also urge homeowners to be cautious with DIY exclusion methods and social media “hacks.” Many of these approaches fail because they seal bats inside, leave active entry points unaddressed, or create unnecessary risks for both the bats and the homeowner.
Over the years, we’ve corrected plenty of failed exclusion attempts, including some performed by well-intentioned homeowners and, unfortunately, a few by professionals who should have known better.
The Bottom Line
Successful bat exclusion doesn’t depend on gimmicks or expensive materials. It depends on understanding bat behavior, complying with Iowa regulations, identifying all active entry points, and installing exclusion devices correctly.
When done properly, humane bat exclusion removes bats from the structure while protecting an important part of Iowa’s ecosystem.
If you think bats may be living in your home or you’ve seen a bat and aren’t sure what to do give us a call. We’ll inspect the property, explain your options, and help you choose the safest and most effective solution.
Think you might have bats?
Contact Bats and Bugs Pest Solutions to schedule your free bat inspection. We’ll assess your home, explain the next steps, and make sure both your home and Iowa’s bats are handled the right way.
