How to Fix an Uneven Garage Floor When I Can't Roll Things In or Out

Clean the garage floor with a mop and scrub brush. Use a pH-neutral cleanser to remove any dirt deposits from the floor’s surface. Switch to a concrete degreaser if you encounter any oil stains. Scrub the stains with the degreaser then rinse off the floor with clean water.

Use a leveling bar to identify all uneven areas of the garage floor. Shift the materials in the garage to one side, compressing them into as small a space as possible. Place the leveling bar onto the floor then drag it along the concrete, directing the light from a flashlight beneath it. When the light shines clearly beneath it, that’s a low spot. Mark it, as such, with a piece of chalk. When you can see a bump in the bar, that’s a high spot. Mark high spots as well with a different marking than the low ones. Shift the items in the garage to the other side then repeat the process with the leveling bar.

Lower any high spots until they’re even with the surrounding garage floor by grinding them down with a concrete grinder. Use safety goggles and a face mask to protect your lungs before using the machine. Position the grinder above a marked high spot and turn it on. Move the grinder in small circles over the concrete, grinding it away until you have a spot that’s level with the surrounding floor. Periodically check for level with the leveling bar. Grind all of the high spots on one side, then move the garage items, if necessary, and grind down the other side. Sweep up the concrete dust with a broom.

Cover the marked low points with a layer of bonding adhesive. Roll the adhesive in place with a nap roller then let the adhesive dry until it's tacky to the touch.

Mix a batch of self-leveling compound with a mixing stick in a bucket. Pour the compound into the marked low areas, spreading the mixture with a squeegee until it reaches the level of the surrounding garage floor. Allow the compound to dry for 48 hours then move the materials in the garage to the other side and fill in low-lying areas with another batch of compound.

Check the floor with the leveling bar to ensure that you didn't miss any uneven portions of the garage floor. Grind down or fill in any missed areas to complete the repair.