Cracks
Cracks like this one aren't only ugly, but its an easy source for water to infiltrate the soil under the slab, causing it to weaken and shift.
Large Gaps
If you see this, call a professional . We have an amazing concrete sealant that work to fill voids such as this one. NexusPro is a silicone-based sealant for joints and cracks specially engineered to provide long-lasting flexibility and to stand up to harsh weather conditions. Unlike traditional polyurethane sealants, NexusPro resists UV rays, which means it won't crack, bubble or dry.
PolyLevel
PolyLevel utilizes high-density, expanding polyurethane foam to raise slabs back to a desired level. This is done by boring small (penny sized) holes in the slab, and using specially designed equipment to inject a structural grade polymer into the void.
NexusPro Sealant
A sealed concrete crack is a safe concrete slab! Any crack- even the man made ones during installation NEED to be sealed to stop rainwater from infiltrating and weakening the soil beneath.