Crawl Space Rodent Control: 3 Things To Check For To Prevent Rodents From Nesting

Posted on: 20 October 2016

Regardless of how lovely your residence may be, it may also be home to many small rodents like mice and rats. In fact, nearly one-third of Americans admit that they have a rodent problem at home. To prevent yourself from having to deal with these headaches and nightmares in the future, inspect your home regularly to look for the following 3 features that allow rodents to nest in crawlspaces. You should inspect your crawlspace regularly to avoid any unwanted surprises. Keep in mind that rodents have a short gestation period and, as a result, can repopulate rather quickly.

Holes and Cracks That Can Act as Entry Points

Rodents have a knack for crawling into small spaces with ease. A mouse can crawl through a hole as long as they can squeeze their head through. The size of the hole only needs to be approximately ¼ inch for a mouse to squeeze its way through. The same can be said for rats, although they tend to be a bit larger and will only fit in holes that are slightly larger than one that can allow a mouse entry. It's difficult to determine when crawlspaces are infested with rodents like mice, as you likely don't spend a significant time there.

Inspect crawlspaces regularly for small holes and cracks. Seal these potential entry points with caulk, rubber putty, and other types of material. Crawlspaces can become a safe haven for rodents, so one of the first steps to rodent control is to be able to limit the amount of entry points that lead to the crawlspace. Detecting small holes and cracks can be difficult. You'll need a strong flashlight during the inspection.

Organic Materials That Can Become Food Sources

Some of the materials used for structural support or even insulation in a crawlspace are made from organic materials. Although they're not technically food that you'd consume, they are edible to rodents, and rodents like to keep food close to their nests. In fact, some rodents may even feast upon these organic materials. Clean the crawlspace regularly to make sure that there are no organic materials present. This might include dead insects or even decomposing plant matter. Cellulose found in insulation is also often a popular food source for rodents. Make sure that the insulation installed in your crawlspace is properly secured.

If you have a habit of turning crawlspaces into storage spaces, you'll also need to be rather diligent in keeping an eye on what's stored in the crawlspaces. You definitely need to avoid storing food there, as the food will be easily accessible to the rodents. Storing food in crawlspaces for even a short period of time may not be a good idea. It's not unusual for homeowners to forget that they've stored food in the crawlspace until it's too late.

Pools of Water Necessary for Quenching Thirst

To survive, all organisms need to have access to a plentiful water source. If your house is leaking, there's a good chance that the water is penetrating into the crawlspaces. Depending on where your crawlspaces are located, the water can start to pool at the edges and corners or even at specific sections within the crawlspaces. This type of water source may be just what rodents need in order to thrive and start their own colony. Most female rodents don't want to travel far after giving birth. Locations with easy access to water will seem like a safe haven to them and the babies they give birth to. 

When inspecting your crawlspaces, look for water leaks and even water stains on the walls, ceilings, and floors. Wall stains indicate that the area is prone to leakages. 


It's easy to neglect the crawlspaces of your home. Don't forget to check everywhere in the crawlspaces for signs that might attract the rodents, as the crawlspaces are some of the best hiding spots within your home for rats and mice to nest. For information on crawl space rodent control, check out websites like