When Should You Panic About Foundational Cracks?
Answer: Never
(Here's What to Do Instead)
Are the cracks in the foundation of my home normal?
- Some foundation cracks are normal due to soil movement and settling
- Hairline and small vertical cracks are often cosmetic
- Horizontal, widening, or leaking cracks are not normal
- Louis clay soil increases the risk of movement
- A professional inspection is the best way to determine the severity
While some cracks in an aging foundation are not unusual, never assume what you’re looking at is normal. Call an expert like Waterproof Solutions to confirm.
Noticed a crack in your foundation and are concerned? That is absolutely understandable. Few things make homeowners more uneasy than spotting a crack in the foundation. And the question bears asking--is it normal settling, or the start of a serious structural issue? The truth is, some foundation cracks are expected, especially in the St. Louis region. Others deserve prompt attention.
Today, Steve Heinrichs, the owner of Waterproof Solutions and our leading expert, is talking about foundation cracks. Take a listen to his video and read our blog to learn more.
What Do Foundation Cracks Look Like?
Foundation cracks don’t all look the same, and their shape often tells an important story.
Vertical foundation cracks
Vertical cracks are among the most common and often appear as a home settles or as concrete cures. These cracks usually follow a straight up-and-down line and are often considered non-structural. While they may not signal immediate danger, they can allow moisture intrusion if left untreated.
Horizontal foundation cracks
Horizontal cracks typically form along basement walls and are more concerning. They often result from pressure exerted by soil surrounding the foundation, especially when that soil expands due to moisture. Horizontal cracking may indicate bowing walls or structural stress and should always be professionally evaluated.
Stair-step cracks
These cracks follow the mortar joints in concrete block or brick foundations, forming a step-like pattern. Stair-step cracks often point to uneven settling and can worsen if underlying soil movement continues.
Hairline cracks
Hairline cracks are very thin and common in both new and older homes. While often cosmetic, they can still allow water seepage and should be sealed to prevent moisture-related problems.
What Foundation Cracks Are Normal for Homes in St. Louis?
St. Louis homes sit on clay-rich soil that expands when wet and shrinks when dry. This constant movement puts stress on foundations, even well-built ones.
Generally considered normal:
- Hairline cracks in poured concrete
- Small vertical cracks that are not widening
- Cracks without water intrusion or interior damage
That said, “normal” doesn’t mean “ignore indefinitely.” Even minor cracks can become pathways for moisture, which may lead to basement leaks, mold growth, or long-term deterioration. If you’re worried about your home, you should give one of the leading foundation repair specialists in St. Louis, like Waterproof Solutions, a call.
When Do Foundation Cracks Become a Problem?
Certain warning signs indicate that a crack may be more than cosmetic. Homeowners should be cautious if they notice:
- Cracks wider than 1/8 inch
- Horizontal cracks or bulging walls
- Cracks that grow over time
- Water leaking through the foundation walls
- Doors or windows sticking or shifting
- Uneven floors near cracked areas
These symptoms suggest that structural movement or water pressure may be affecting the foundation and should be addressed promptly.
What Causes Foundation Cracks?
Foundation cracks don’t happen randomly. Common causes include:
- Soil expansion and contraction
- Poor drainage around the home
- Hydrostatic pressure from groundwater
- Improper grading or gutter runoff
- Natural settling over time
Because these causes vary, effective repair depends on understanding why the crack formed—not just sealing what’s visible.
What Should You Do If You Find Cracks in Your Foundation
1. Stay calm
Not every crack means structural failure.
2. Observe and document
Take photos and note changes in width, length, or moisture.
3. Avoid temporary surface fixes
Paint and basic caulk may hide the crack, but won’t stop underlying movement.
4. Schedule a professional inspection
A trained specialist can determine whether the issue is cosmetic, moisture-related, or structural.
Waterproof Solutions provides St. Louis professional foundation repair solutions that focus on long-term stability, not quick fixes.
Why Does Early Action Matter?
Small foundation issues are usually easier—and more affordable—to fix than advanced damage. Early evaluation helps:
- Prevent water intrusion and mold
- Reduce structural stress
- Protect resale value
- Avoid extensive repairs later
Ignoring early warning signs can allow minor issues to compound over time, especially in challenging soil conditions like those found throughout the St. Louis area.
If you’ve noticed cracks in your foundation—or simply want reassurance—Waterproof Solutions is here to help. As leading foundation repair specialists in St. Louis, we provide honest assessments and repair solutions designed to protect your home for the long haul.
Schedule a foundation inspection today and get clear answers.
Foundation Crack FAQs
Q: Are foundation cracks common in St. Louis homes?
A: Yes. Many St. Louis homes develop foundation cracks due to clay-rich soil that expands and contracts with moisture changes. Some cracking is normal, but all cracks should be evaluated.
Q: What types of foundation cracks are usually considered normal?
A: Hairline cracks and small vertical cracks caused by concrete curing or minor settling are often considered normal if they are stable and not leaking.
Q: Are horizontal foundation cracks a serious problem?
A: Horizontal foundation cracks are more concerning than vertical cracks and may indicate soil pressure or structural stress. These cracks should be inspected by a foundation repair professional.
Q: Can small foundation cracks cause water leaks?
A: Yes. Even small foundation cracks can allow water intrusion, which may lead to basement leaks, increased humidity, or mold growth over time.
Q: When should I call a foundation repair specialist?
A: You should contact a professional if a crack is wider than ⅛ inch, is horizontal, leaks water, or continues to grow.
Contact Waterproof Solutions: the leading foundation repair specialists in St. Louis!