Yes, ants frequently build nests under patio stones. Pavers and patio stones often sit on sand or soil, which gives ants a protected cavity with a stable temperature and moisture where they can build nests undisturbed.
Ants like to look for places where the temperature is stable and there is adequate moisture in order to build nests. Pavers and patio stones provide both, which is why ants tend to build right underneath them.
Pavement ants are common in Middlesex, New London, and Windham counties. They are small and dark, and they often nest under slabs, walkways, driveways, and patio stones. When you see little mounds of excavated soil pushed up between joints, you’re seeing the work of pavement ants. That said, it’s not always pavement ants and you can run into odorous house ants and carpenter ants when turning over patio stones.
To reduce the appeal of patio stones to ants, you can first keep patio joints filled. This is best done with polymeric sand, which resists excavation better than plain sand. It also helps to fix drainage so water doesn’t constantly run into the hardscape. Sweep up food debris around outdoor dining areas as well. If you have mulch right by the edge of your patio, consider pulling it back and trimming any vegetation that shades the area while you’re at it.
Once you do all this, your best bet is to treat. Once ants get established under slabs, you’re not going to be able to dig them out. Baits carried back to the colony can help because that’s the best way to reach the queen. But even so, perimeter treatment will help even more by preventing ants from going from the patio to the house.
If ants are nesting under your patio, Mosquito Squad of Middlesex, New London & Windham County can help. Mosquito Squad treats the ant colonies in your yard and around your foundation. This will help you protect your patio and keep the trails from reaching your door.
