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Foundation Problems: Cracked Foundation Walls


Cracked foundation walls are often the first sign that your home’s foundation is failing. Foundation walls are under extreme pressure at all times and the older the walls the higher the chance of problems.

Older foundation walls that were built with concrete blocks have minimal strength in withstanding exterior pressure if they were installed without vertical reinforcements. Cement block walls generally crack in the middle of the wall and bow inward. These horizontal wall cracks cause a weakening to the entire structure and definitely require the help of a professional. If you have noticed any horizontal foundation wall cracks in your home, the problem needs to be addressed. If repairs are not made, the wall will continue to crack and your foundation will ultimately be completely unstable, jeopardizing you and your family.

In addition to pressure cracks, shrinkage and settlement cracks can form in all foundation walls. These cracks can be vertical or horizontal. Hairline cracks like these should be watched, as they can sometimes be safely ignored if there has been no change in their size and shape. Settlement and shrinkage cracks do not necessarily indicate a structural problem, but if the cracking is severe and ever changing, professionals should be called and a piering system installed.

Foundation Wall Cracks – Recognize the Differences

Concrete and brick foundation walls are going to crack, the trick is recognizing which ones are ok and which are serious. Here is a list from most to least serious:

Horizontal Cracks– Most commonly caused by frozen, water soaked soil that has expanded and pushed the foundation wall inward or often from soil expansion and shrinkage during extreme moisture or drought. Professional assistance is a must, these cracks often result in the need of a new foundation.

Stair-Step Cracks in Masonry Joints– A misplaced gutter or downspout is probably the cause of these types of wall cracks. Excessive moisture causes more pressure, resulting in cracking, bulging, and bowing.

L-Shaped Cracks– These cracks are usually caused by shrinkage. Generally not a structural issue, but they may need attention if you notice water seepage.

Hairline Cracks– Falling in the mortar and between concrete blocks are normal and rarely worth being concerned about.

Monitor Your Foundation Wall Cracks

If you have noticed a change in any wall cracks, such as widening, spreading, or moving there may be a serious problem. Always monitor the length and width of questionable cracks, you can do so with a pencil by marking the ends directly on the foundation wall. If your marks end up crooked when you check them again, you’ll know that the crack has grown. Be sure to date all marks so when you call us, we can determine the rate at which the wall is deteriorating.


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  • AMC911 Foundation & Waterproofing Systems, Foundation Repair & House Leveling, Norfolk, VA

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