December 20th, 2011 | 
Author: Wondering why you see cracks in your garage concrete slab? Is it a structural problem?
These are almost always due to normal expansion/contraction and or settling. If you removed all the floor coverings from your home, you would see the same cracks. Concrete expands and contracts causing cracks to occur. Ever noticed the grooves in a concrete sidewalk every 5′? These are expansion joints designed to allow the concrete to crack within the grooves (or joints). A typical house slab does not have these joints.
Posted in Home Inspection
