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6 Kinds of Foundation Cracks and What they Mean

January 28, 2021



6 Kinds of Foundation Cracks and What they Mean 

Cracks in the foundation of a home would concern any homeowner. Some important questions may arise such as: Does this crack compromise the strength or stability of my wall? Will the crack become worse? Where did the crack come from? Will water make its way through the crack? What’s the solution?

As a homeowner, you’re going to want to get to the bottom of this issue as soon as possible for your peace of mind and safety. Below you will be able to learn more about different kinds of foundation cracks and what they mean for your home.

Horizontal Cracks

Horizontal cracks are serious. This kind of crack is commonly caused by unbalanced soil and hydrostatic water pressure pressing against the foundation wall. If you notice the foundation bowing inwards and some water leaking into the basement this may be the issue. Block and poured foundations are susceptible to horizontal cracks. If you act immediately and call foundation experts, you can permanently repair these cracks with lifetime guarantees and transferable warranties should you decide to sell your home in the future.

Vertical Cracks

Vertical cracks aren’t as serious as horizontal cracks and are typically not dangerous for your structure. Vertical cracks are usually found in poured foundations and are caused by the foundation settling over time or when the concrete cures.

These cracks can be repaired with an epoxy or polyurethane crack injection. Look out for moisture or cracks about as wide as the edge of a quarter. If your crack doesn’t match this description there is usually no immediate threat.

Stair-step Cracks

The most common victims of stair-step cracks are block foundations. These kinds of cracks occur along mortar joints and are problematic for the integrity of your basement foundation. Stair-step cracks are usually caused by the foundation settling or sinking. Moisture issues outside your foundation can also be a cause.



If you can put more than a quarter’s edge into the foundation crack, the crack is posing a threat. We recommend you call a professional for inspection and repair options.

Diagonal Cracks

Similar to vertical cracks, most diagonal cracks aren’t a serious problem. They are usually caused by the natural curing of concrete or settlement as time passes. The most common way these cracks are repaired is with epoxy crack injections. 

Hairline Cracks

Usually, with a width no thicker than the edge of a penny, hairline cracks can appear due to seasonal changes that result in contraction and expansion in the foundation. These cracks may or may not leak water.



Try to repair these cracks before they begin to widen and allow water seepage. Being proactive and fixing these cracks while they’re small and manageable will save you money in the long run. Use a semi-rigid epoxy fill so that it can flex and stretch with the wall all the while maintaining its seal.

Shrinkage Cracks

Shrinkage cracks are like hairline cracks since they can happen when poured concrete foundations dry out. You will commonly see new homes with shrinkage cracks within the first year.

What Worldwide Waterproofing can do for You 

Keeping track of all these cracks and what they mean may be a little intimidating. If you need any assistance with the foundation of your home, let us know!


Our experts are trained and certified to inspect your home for any kind of crack that could pose a safety or financial risk to you or your family. If you see anything that worries you, give us a call, or book an appointment with us online. We’ll be more than happy to help you any time!


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