In the animal kingdom, there are few creatures that are as clever and resourceful as a mouse. If you have a vulnerability, mice can usually find it and exploit it. Here are some of the common ways mice get inside Pittsburg homes and, more importantly, how to get them out when they do.

Cracked Mortar and Cracked Foundations

Your foundation is one of the first places mice will target if you have landscaping near your walls. Mice hide in landscaping. This brings them into close proximity of potential cracks. It only takes a hole the size of a dime to let most mice into your home. If a crack isn't quite big enough, a mouse can use its teeth to scrape and chip it a little bigger.

Weep Holes and Drilled Holes

Some brick homes have weep holes. If these are not properly protected, those weep holes can give mice quick access to your wall voids. A drilled hole has the potential to do the same. If a hole has been drilled through your foundation or through your brick wall and the wire conduit or pipe wasn't installed, that open hole could be used as an entry point. Mice can jump a foot vertically and scale 13 inches up a smooth surface. If it has some bricks to cling to, it can go even higher. It may even be able to cling to your bricks and scale your wall. You would be amazed at the acrobatic prowess of a mouse.

Gaps Around Utilities, Pipes and Conduit

After an object has been installed in your foundation wall or through your brick wall, it can still be a target for mice. If there is no seal or the seal is damaged, a mouse can squeeze right inside. This is more prone to happen when utilities are installed in a sheltered location and there isn't as much concern for water getting in through an open gap.


If a mouse finds a door in a secluded location, it can chew its way through a door sweep or a door frame. It may also nibble on the seal around the outside of a frame. Your doors are as popular an entry point for mice as they are for you.


If you have windows that are close to the ground, you could have trouble with mice. They can chew through the frame or the seal. This is more likely to happen in locations that have objects to hide under or behind.


The plastic cover over vents is not enough to keep a mouse out. If a mouse can gain access to a low vent, it can climb in and chew its way into your home through rubber or plastic dryer hookups or the seals of duct junctions. If it can't find a way to get all the way into your home, it can still present a serious problem if it uses your ducts as a harborage location or dies inside your ductwork.

The Sole Plate

On top of your foundation, there are horizontal wood members that are called the sole plate or sill plate. In some situations, it is possible for a mouse to chew its way through a sole plate. Usually, this is done when the sole plate has rotted, due to water damage.


Sometimes mice will climb up downspouts to gain access to the roof. On your roof, mice may be able to get in through a roof/soffit intersection, gaskets around exhaust pipes, the seal around the chimney, and more. When they do, they'll find your attic to be the perfect place to build a nest.

Clever Mice

These are only some of the many ways mice can get into your Pittsburg home. Hopefully, these examples will give you some insight into why you're hearing mice scraping, bumping and chewing inside your walls or vents.

If you think you have a mouse infestation—or you'd like to never have a mouse infestation—reach out to Witt Pest Management. We're Pittsburgh's oldest and most advanced pest control provider. We use well-established and trusted rodent control products and methods to remove rodents and prevent new rodents from getting in and replacing the rodents that have been removed. If you need help removing mice, don't worry, we'll find those mice today.