4 Ways To Fill Holes To Keep Mice Out (And How To Do It!)

Worker applying caulking with a caulk gun to seal mice entry points

You’ve probably experienced the un-welcomed presence of mice! It’s time to take matters into your own hands to prevent these little critters from entering your cozy abode! Using natural methods to seal those holes and keep your home mice-free sounds like a “hole” lot of fun, doesn’t it? In this article, we will delve into the specifics of filling in these pesky little entry points, just for you!

Steel wool, copper mesh, caulk, and spray foam are all fantastic options to consider when looking to safely and effectively seal the mouse-runways in your home. While I’ve personally faced the challenge of keeping these furry intruders at bay, I can assure you, these materials work wonders! My research has revealed some intriguing reasons behind the success of this method, which we’ll explore together in this article.

For instance, materials like steel wool and copper mesh act as physical barriers that are difficult (and uncomfortable) for mice to gnaw through.

Caulk and spray foam, on the other hand, work wonders in sealing gaps and providing a barrier that mice simply cannot penetrate! So, without further ado, let’s get to the “nuts and bolts” of keeping your home mouse-free, naturally!

Key Takeaways:

  • Steel wool, copper mesh, caulk, and spray foam are effective materials for filling holes to repel mice.
  • Filling holes is a natural and proven method to prevent rodent infestations.
  • The focus of this article is on how to fill mouse holes using natural methods, while providing in-depth scientific analysis and personal anecdotes.

* This post contains affiliate links.

Identifying Mouse Holes

Oh, mice! Those pesky little rodents can cause quite a panic. If you’re someone looking for natural methods to repel mice, you’ve come to the right place. Identifying mouse holes is the first step to keeping them away. Let’s dive into the world of mouse holes and fill them up without harming our furry visitors.

Signs of a mice Infestation

Did you know that mice leave behind clues? You might just suspect an infestation if you notice any of the following:

  • Small droppings, which look like black grains of rice
  • Gnaw marks on furniture, walls, or food containers
  • Scratching or scurrying noises, especially at night

If you’ve spotted any of these, we highly recommend you investigate further. Mouse infestations are more common than rat infestations, so if you notice these signs, you’re probably dealing with a mouse. The University of California even states that mice infestations are 10 to 20 times more likely than rat infestations.

Common mice Entrance Points

Mice can squeeze through tiny gaps, the size of a dime, making it crucial to identify and seal these entrance points. Some common places to mouseproof include:

Entry PointVulnerabilityEntry Point
Cracks and gaps in exterior wallsPoor sealing or caulkingMice can squeeze through openings as small as 1/4 inch
Holes in roofs or eavesDamage or wear and tearMice can climb up the side of a building and enter through gaps in the roof or eaves
Gaps around pipes and utility linesPoor sealing or gaps in insulationMice can follow pipes and utility lines into a home and enter through gaps in the insulation or around the pipes
Open windows and doorsLack of screening or closing properlyMice can easily enter through open windows or doors if they are not screened or closed properly
Chimneys and ventsLack of screening or damageMice can climb up a chimney or enter through a damaged vent if it is not properly screened

Now, let’s move on to the natural solutions you’ve been waiting for!

Steel Wool

One of the most effective ways to fill mouse holes is using steel wool. Mice find it extremely challenging to nibble through the rough fibers, making this an excellent deterrent.

To use steel wool for filling mouse holes, grab a handful, bunch it up, and stuff it into the opening. We suggest using gloves to protect your hands, and don’t forget to pack it tightly.

Copper Mesh

Another fantastic option is copper mesh. This material is rust-proof and has a similar effect to steel wool. To fill holes with copper mesh, cut a piece large enough to cover the hole and stuff it in, making sure it’s secure and snug.

Caulk, Flex Seal And Spray Foam

Caulking, flex seal or spray foam are great choices when it comes to filling holes. Though mice can chew through these materials, combining them with steel wool or copper mesh can add an extra layer of protection. Apply caulk or spray foam over the wool or mesh, sealing the entrance completely.

Here’s a bit more information on using spray foam to keep mice away as it’s one of the best options you have!

Materials to Fill Holes To Keep Mice Out

Steel Wool Used To Repel Mice

As someone looking for natural methods to repel mice, it’s essential to know about different materials you can use to fill entry holes. Let’s dive into the scientific details of each material.

Steel Wool

Steel wool is a popular and effective material for filling holes and keeping mice out! You might have heard that mice can’t chew through steel wool. That’s because the loose, coarse fibers irritate and harm their mouths.

Make sure to use coarse-grade steel wool like Alabrocon’s Steel Wool Fill Fabric for optimal results.

Copper Mesh

Another fantastic option for filling holes is copper mesh. The sturdy metal design makes it nearly impossible for rodents to gnaw through. Moreover, it’s easy to cut and shove in the cracks and gaps to keep those pesky intruders out.

You might prefer copper mesh to steel wool due to its durability and rust-resistant properties, but know that both will work to deter mice! Californistan’s Copper Mesh Roll is an excellent choice to keep those pesky rodents at bay!

Caulk and Silicone Caulking

Caulking is a hidden gem when it comes to filling holes! I recommend using silicone caulking like Gorilla’s Waterproof Caulk And Seal for best results, it’s what worked for me! It not only keeps mice away but also effectively seals gaps and cracks against moisture and drafts. Don’t forget, you’ll also need a caulk gun, and nothing works better than the CONFAST 10 oz Manual Caulking Gun.

To double the protection against mice, mix caulk with steel wool or copper mesh. This blending creates a tough barrier that mice utterly dislike.

And hey, if you’re sold on the idea of using household items to repel mice, head on over to our article about the best ways to naturally repel mice!

Spray Foam

Spray foam is an excellent quick fix for filling holes and insulating gaps. However, rodents might still chew through it if they’re persistent enough. So, take my word for it and make your spray foam barrier even more robust by reinforcing it with steel wool or copper mesh.

Loctite is a trusted brand in the spray foam industry, which is why I recommend using Loctite’s Tite Foam Gaps & Cracks Spray Foam. As the name suggests, it works wonders to seal gaps and cracks around your home to keep mice out.

Check out our article on the best spray foams we recommend using!

Securing Mice Entry Points

Doors and Windows

Using steel wool and copper mesh are both great options for sealing door gaps! You can stuff the gaps with steel wool or copper mesh and apply caulk to keep it in place. This is an effective way to keep mice away because they cannot chew through the material. Plus, it doesn’t hurt the environment!


Vents can be a common entry point for rodents. Make sure to fill any holes around vents with caulk or spray foam. It’s astonishing how effective this can be – just like when I plugged a hole near my bathroom vent! Did you know mice avoid chewing on these materials? So just apply caulk or spray foam to the gaps and keep those rodents outside!

Utility Lines

Utility lines can also act as a highway for mice. Once, I found a mouse in my attic and traced its entry point to a utility line gap. The solution was simple: sealing the gap by using caulk. Sometimes, it’s also useful to wrap the lines in steel wool, giving it an added layer of protection.

Fireplaces and Drains

You may not believe it, but fireplaces and drains can invite rodents. One way to combat this is by blocking any gaps with a combination of materials. Start with a layer of steel wool or copper mesh, and then apply spray foam or caulk on top. Just make sure not to block any essential airways! This method effectively deters mice from entering your home.

Exterior Walls

Finally, let’s discuss exterior walls and any gaps or cracks that may be lurking in them. Sealing these entry points with caulk or spray foam is crucial to keep mice out.

Additionally, you can reinforce the sealing with steel wool or copper mesh. This way, you’re protecting your home naturally without harming any mice, turning your home into a rodent-free fortress!

Preventing Future Mice Infestations

Cute Little Grey House Mouse Hiding in Window Sill of garage

Home Maintenance

You can avoid mice infestations by taking a proactive approach to home maintenance. First, identify any cracks or openings that are at least 1/4 inch wide. Next, fill the holes with the right materials. Here are some effective methods to fill the holes and keep mice away:

  • Steel wool: The rough texture of steel wool is difficult for mice to chew through, making it an excellent material to fill small holes.
  • Copper mesh: Like steel wool, copper mesh is difficult for mice to gnaw on. It also has the added benefit of being corrosion-resistant.
  • Caulk: Applying caulk around steel wool or copper mesh can help to hold the materials in place and create a more solid barrier. This might not be the best option on its own, as mice can chew through some types of caulk.
  • Spray foam: For larger holes, you can use spray foam to fill the gaps. However, make sure to cover the foam with a more solid material, like metal sheeting, to prevent mice from chewing through it.

Food Storage

Mice are attracted to easily accessible food sources. It’s important to keep food stored in airtight containers and avoid leaving food out in the open. In addition, clean up any crumbs or spills promptly! This will help deter mice from finding their way into your home.

Pet Food Management

If you have pets, be sure to store their food in sealed containers as well. Don’t leave pet food out overnight, as this can attract mice. By properly managing your pet’s food, you reduce the likelihood of attracting rodents into your home.

Pest Control

When all else fails, don’t hesitate to consult with a professional. Pest control experts have the experience and knowledge to help identify problem areas and provide tailored solutions for your situation. They can guide you in selecting the most effective methods and materials to keep mice at bay – especially when it comes to filling those pesky holes!

Our nationwide pest control finder can help get you in contact with a local professional.

Remember, taking these preventive measures can help safeguard your home from unwanted mice and rodent infestations. By focusing on home maintenance, proper food storage, pet food management, and working with pest control experts, you can ensure a mice-free home.

Alternative Mice Control Methods

peppermint essential oil to repel mice

Essential Oils

Peppermint oil is one of the most popular essential oils for rodent control. You see, mice have a sensitive sense of smell, and they find the strong scent of peppermint oil to be unbearable. A few drops of this oil in areas where mice can enter, such as holes, windows or near weather stripping, can turn them away.

Another essential oil that can help keep mice at bay is eucalyptus oil. Just like peppermint oil, the powerful aroma of eucalyptus can deter rodents! To make the most out of these oils, you can simply soak cotton balls in them and place them around mice-infested areas.

Plants That Mice Hate

Who would have thought that your green thumb could also help with rodent control, huh? There are certain plants that mice can’t stand, and some of these are as follows:

  • Mint: Mice can’t stand the potent smell of mint. Planting mint in your garden not only adds some vibrant greenery but also helps to deter mice!
  • Camphor: Camphor has a pungent, medicinal aroma that discourages mice from choosing your home as their residence.
  • Lavender: This fragrant, purple plant is famous for its calming effects on people, but don’t expect mice to be fans of it. Your friendly neighborhood rodents find the scent way too intense!

Scents that Mice Hate

Did you know? Mice have quite the aversion to some unexpected scents! And you can use this to your advantage. Let me walk you through some of the smells they can’t bear:

  • Ammonia: Mice relate ammonia’s strong smell to that of predators’ urine, making them want to stay as far away as possible! Placing small containers filled with ammonia around infested areas can work wonders!

Now, let’s talk about filling holes to keep mice out. There are different types of materials you can use to seal gaps and prevent mice from entering: steel wool, copper mesh, caulk, and spray foam.

Fill small holes with steel wool or copper mesh, and put caulk around the filled hole or use spray foam to make sure it stays in place. Filling holes effectively repels mice as it eliminates their points of entry, making your home a fortress they can’t breach!

So, next time you find those pesky mice trying to weasel their way into your home, remember – you’ve got some handy, all-natural allies in the form of essential oils, plants, and surprising scents. They’ll be scurrying away in no time!

Wrapping Things Up

Keeping mice out of your home requires a combination of techniques. Steel wool and copper mesh are excellent options for filling holes and gaps, while caulk and spray foam are ideal for sealing larger openings. However, it’s important to note that these methods may not be enough on their own.

If you’re looking for alternative solutions, essential oils and scents that mice hate can be effective in deterring them from entering your home. Peppermint, eucalyptus, and lavender are great options to try out.

If all else fails, it may be time to call in a pest professional. They have the expertise and tools necessary to eliminate mice from your home and prevent them from returning.

Remember, the key to a mouse-free home is using a combination of techniques. Don’t rely on just one method – instead, use a variety of options to create a barrier that mice can’t penetrate. With a little effort and persistence, you can keep your home free of these unwanted guests!

How to pest proof your home in under a day e-book by Zack DeAngelis

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