Cracked Slab Foundation

What is a “cracked slab foundation” ?

Most concrete slab foundations were and are built with steel rebar or post tension cables for strength. Slabs built with rebar and cables have a degree of flexibility that allow “bending” or “flexing” over a period of time. The cracks that are observed by a homeowner in his / her concrete slab foundation are usually the result of soil expansion from excess water or soil contraction from a lack of water. Fortunately, in numerous cases, the integrity of the slab foundation has not been adversely affected. These cracks are the evidence of slight movement – they are not an indication of separation of the slab into two pieces.

However, a cracked slab foundation can be more serious. Many factors can contribute to a more severe problem with the homeowner’s slab foundation. Some of these are inferior construction by the builder, inferior concrete quality, and / or excessive soil movement due to excessive expansion or contraction of the soil.

Indications of cracked slab movement:

  • interior floor problems such as cracked tiles, buckled linoleum, dome-shapes, or uneven floors
  • cracks in exterior foundation or exterior stucco
  • doorframes that are out-of-square; doors that do not close properly
  • cracks in interior sheetrock

What should you do about a “cracked slab” ?

If the cracks are 1/8″ in width or less, there probably is nothing to worry about. If the slab cracks are 1/4″ wide or greater, then you may want to have a professional foundation inspection. If there is a difference in elevation on each side of the crack, then an inspection is certainly warranted. Please click on the following link for more information about our FREE Home Foundation Inspection.

Scroll to Top