They are under your sidewalk. They lurk under your driveway. They may even exist under your car at night. You can’t see it. You may not even be able to hear it. But it is there. And with each passing season, it gets worse. When it gets worse, it becomes wider and deeper. What is this thing that would keep you up at night if you knew it was there? A void is a large gap or space under your concrete driveways, your sidewalk, your patio and your garage floor.
A void causes your concrete slab to act more as a bridge than a support. This “bridge” is not designed or constructed to act like a bridge. Over time the concrete that is suppose to support will give way or sink. It does not take a large void to create big problems. Some of the problems that result from your concrete now serving as a bridge are visible. Some are not.
How do you know if you have a void?
Sometimes the signs that you have a void are there and sometimes the signs are not as obvious. Garage floors show the least visible sign that there is a void under them. You can usually tell there is a void under your garage floor by hearing it or feeling it. When you drive over a void you will hear the shallowness of the space under the floor. You may also feel a slight tremor in the concrete as well. Small cracks may also be visible in the garage floor.
Void under a Driveway
If your driveway has a void underneath it, it will be more obvious. There may be longer and deeper cracks in your driveway (the longer you wait the deeper and wider these cracks may become), the concrete slabs may be uneven, the concrete by your garage door may appear to have sunken, or the driveway by the street is now sunken or cracking.
Your concrete patio shows signs of a void when the steps to your patio have gaps in them larger that ½” Most steps were created to code which is 7 ¾” high. If your steps are larger than this, they may be sinking into a void that is there.
A void under a concrete sidewalk will be visible as uneven slabs and possibly show cracks in the surface of the slab.
Having voids under a garage floor or a sidewalk can be dangerous. Your car could actually sink into the hole that will be created beneath when the “bridge” gives out. Tripping on an uneven sidewalk could result in anything from a skinned knee to a broken wrist or hip. Not taking care of the voids in a timely manner will definitely be more expensive as the void expands with seasons and it takes more polyurethane lifting foam to fill it.
What you can’t see can hurt you. It can hurt your car, your knees and your wallet. Contact the concrete repair specialists at Concrete Raising Systems today. They use Polyurethane foam to lift and raise your concrete garage floors, sidewalks, driveways and patios. Unlike traditional mud, cement and water mud jacking, Polyurethane will not sink and it is impervious to the weather. 40% of the jobs we have done followed a job that traditional mud jacking failed to do and when we raise your concrete with foam, it is raised for good!