Just like it sounds, a root barrier is used to redirect or stop root growth. Tree roots are often the silent enemy. Since they can rarely be seen, they can sneak up on you and wreak havoc on the structure of your yard or house without you even realizing right away. Roots grow under sidewalks, driveways and houses and can cause cement slabs to lift or crack, as well as cause damage to pipes that may sit under your house, such as plumbing infrastructure. The best way to combat this root growth before it becomes a big problem is by introducing a root barrier.