
Foundation Crack Repair: Causes, Types & Permanent Fixes
Most foundation cracks can be repaired, and not every crack is a sign of major structural damage. The key is understanding what type of crack you're seeing. While some cracks are strictly cosmetic, others suggest foundation movement that deserves a professional evaluation. NV Waterproofing and Foundation Repair pinpoints the cause and recommends the right long-term repair to help protect your home.
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Symptoms
Signs You Shouldn't Ignore
Foundation cracks can be perfectly harmless, but a few signal structural movement. Cracks warrant closer attention if they're wider than ¼ inch, run horizontally, continue to grow, leak water or show up alongside other foundation problems like sticking doors, sloping floors or a leaning chimney.
As a general rule, hairline, vertical cracks that hold steady are often cosmetic, while horizontal, widening, leaking or growing cracks should be professionally evaluated. If you're unsure which type you have, a professional inspection is the best way to tell whether repairs are necessary.

Fine Hairline Cracks

Vertical Foundation Cracks

Side-to-Side Cracks

Stair-Step Cracks in Block Walls

Diagonal Cracks

Slab and Floor Cracks
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Causes
What Causes Foundation Cracks?
Foundation cracks happen for a variety of reasons. Some are simply part of concrete curing and aging, while others result from foundation movement or pressure around your home. Knowing what's causing the crack is the first step toward determining whether it's cosmetic or requires a structural fix.
Routine Concrete Curing & Shrinkage
As concrete cures, it shrinks a small amount naturally. This process can create small hairline or vertical foundation cracks that are often cosmetic and don’t affect the structural integrity of your home.
These cracks most often appear within the first few years after construction and typically stay narrow and stable over time. While they’re typically harmless, sealing them can help prevent water intrusion and keep them from developing into larger issues.

Foundation Settlement
When the soil beneath your home shifts or settles inconsistently, different parts of the foundation can move at different rates. This movement often creates vertical, diagonal or stair-step cracks that may signal foundation settlement.
Settlement can occur because of fluctuating moisture levels, poorly compacted soil, erosion or other site conditions. If settlement continues, cracks may widen and other symptoms such as sticking doors, uneven floors or gaps around windows can develop.

Hydrostatic Pressure
When water collects in the soil surrounding your foundation, it creates hydrostatic pressure against basement walls. Over time, this pressure can cause cracks, inward bowing or further structural movement.
Hydrostatic pressure is most prevalent after heavy rainfall or where drainage is poor. Because soaked soil is far heavier than dry soil, it places ongoing stress on foundation walls. Upgrading drainage and stabilizing the wall can help prevent more movement.

Expansive Soils & Seasonal Ground Movement
Many soils expand when wet and shrink as they dry. Combined with seasonal temperature changes and freeze-thaw cycles in colder climates, this constant movement places repeated strain on foundations.
Over time, soil that expands and contracts can play a role in foundation settlement, wall cracks and slab movement. Homes in areas with expansive clay soils or frequent seasonal moisture swings are particularly susceptible to this type of foundation damage.

Why Foundation Cracks Deserve Attention
Foundation cracks rarely get better on their own. While many begin as minor surface-level cracks, structural cracks can keep widening as soil movement and foundation settlement continue. Addressing problems early often prevents more damage and costlier repairs down the road.

Ignoring foundation cracks may lead to:
- Wider or longer foundation cracks
- Water intrusion and basement moisture issues
- Bowing or shifting foundation walls
- Further foundation settlement and structural movement
- Larger and more expensive repairs down the road
The sooner foundation cracks are professionally evaluated, the easier it is to identify the underlying cause and recommend the right repair before the damage progresses.
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Foundation Crack Repair Solutions
Every foundation crack has an underlying cause, and lasting repairs begin with identifying it. Some cracks are caused by foundation settlement, while others are caused by soil pressure or structural movement. After a thorough inspection, we'll recommend the right solution to stabilize your home and help prevent repeat cracking, not just address the visible symptoms.

Push Piers

Helical Piers

PowerBrace®

GeoLock®

CarbonArmor®

SmartJack®
How It Works
How We Fix Foundation Cracks

Step 1
Inspect & Assess
Every repair begins with a complete foundation inspection. Your specialist will inspect each crack, measure any movement, and look for other signs of foundation problems to uncover what’s behind the damage.

Step 2
Determine the Root Cause
Not every crack requires the same repair. We’ll determine whether the crack is caused by normal concrete shrinkage, foundation settlement, hydrostatic pressure, soil movement, or another issue, then explain our findings and provide a written repair recommendation.

Step 3
Install the Right Solution
Once the cause is identified, we recommend the solution that’s right for your home. Depending on the problem, that may include CarbonArmor®, PowerBrace®, GeoLock® Wall Anchors, EverBrace® or foundation pier systems to permanently secure the structure.

Step 4
Protect Your Home Going Forward
After repairs are complete, you can rest assured that your foundation is protected by field-proven repair systems backed by NV Waterproofing and Foundation Repair‘s written, transferable warranty, and lasting peace of mind.
Benefits
Why Homeowners Trust NV Waterproofing and Foundation Repair
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What To Expect
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An expert will inspect the problem area and surrounding conditions, including soil movement, drainage, structural integrity, and any related concerns.
Clear explanation
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We’ll walk you through what we’re seeing in easy-to-understand language so you know the root cause of the issue, not just the symptoms.
Review recommendations
If repairs are needed, we’ll outline your options, pricing, and timeline so you can make the best decision for your home.
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Don't just take our word for it
See what our customers have to say about our work.
NV Waterproofing was extremely responsive and 100% committed to identifying our water problem and designing a solution. Their work was excellent. The crew was on time and organized. They were very careful to protect the exterior landscaping and the interior of our home from dirt and debris. Even two years later, they responded to a sump problem at no additional charge. NV Waterproofing does the job right and stands behind its work.
Mike and Lynn F. | Columbia, MD
We bought a house in a state of disrepair, and so we've had to work with a number of contractors. I'd rank this company at the top of the list for their professionalism, knowledge, experience, and honesty. We had bowing of our basement walls that needed to be addressed. Michael came out to assess the situation, and gave us some options. After speaking with him, I felt very confident in their ability to buttress our walls. It was also a huge bonus that we were able to set up a payment plan for this job too. When the team showed up, Casey, Kevin, and Grant, they were super polite and professional. They took great care of our property, and if they had a question about anything, they asked. Also, if I had a question, Casey (the foreman), was very knowledgeable and quick to answer. They presented the work as they progressed through the job, and really, I was actually a little blown away by the scale of the project, and the speed at which they worked. What an impressive job they did! We're very confident in the work they did and will hire them again.
Ellen M. | Takoma Park, MD
We were referred to NV Waterproofing from my brother-in-law who used them and was pleased. They came out and gave us an estimate - they were very prompt. We had the work done - it looked great and I am sure will do the job (only time will tell). We did have a miscommunication with the work (mostly on our part), but the owner had it fixed promptly and without additional cost. I would highly recommend them to anyone with water issues in their basement.
Susan C. | Washington DC, DC
NV stuck with me and made sure I was happy. Roberto Jr kept me calm as my problem persisted and kept working on a solution beyond the obvious. I highly recommend. Looking forward to a dry basement this summer.
Dean R. | Washington, DC
I am writing this letter to commend members of your organization for the waterproofing work performed on and around the foundation of my house. Despite situations beyond the control of both me and your associate, he always maintained professionalism and demonstrated why he is an outstanding representative of your organization. The crew obviously knew what had to be done and went about doing it. They were prompt in arriving at work each day, diligent in the performance of their duties (in spite of high heat and humidity), and took measures to ensure the safety around the excavated area (important because of children in the neighborhood). Unlike other construction sites I have seen, the crew maintained the area free of litter— no small measure these days! In addition, the crew always provided clear explanations of the work to be done each day, answering the questions with forthright and clear responses, never hurrying the discussion. As I was not on site while work was being done, they called me several times, taking those extra steps to keep me informed of the status of the work and aware of the tasks yet to be performed— something that is greatly appreciated. I would appreciate it if you would offer my heartfelt thanks to your able crew for the quality waterproofing work performed and the excellent communication and coordination exhibited by them.
Myra L. | Washington, DC
In my 12 years of having NV Waterproofing as a business partner, they have always proved reliable and trustworthy. They are a great value for me and my customers.
Darryl O. of Brookfield Homes, | Washington, DC
Great professional service and able to respond in timely manner to the project need.
Blake B. | Washington, DC
Brendan was very knowledgeable, professional and courteous. Highly recommend.
Cesar T. | Arlington, VA
A brief note to thank NV Waterproofing for extreme professionalism and courtesy in the manner in which my recent basement water seepage problem was addressed. From the initial contact with Jim, through the work with Roberto, Carlos and Jose, it was an overall pleasant experience – not to mention my contact with the owner and his responsiveness.
Ramesh T. | Arlington, VA
These guys were amazing. The initial visit was smooth, not pushy at all and he was even able to accommodate the relocation of a small drainage pipe. The demo to install the system was done beautifully, yes it was really good, you can tell they were precise and careful when doing so. Everything was clean, no stains on my carpet and they protected everything. No leak so far and I love it. Did I mention the price was excellent? I had 3 other companies to estimate thousands and even tried to sell extra unnecessary equipment. Thank you NV Waterproofing I have and will continue to recommend you.
Chelly Z. | Falls Church, VA
We appreciated NV Waterproofing's honesty and the men who worked tirelessly in uncomfortably cold weather. We've had one big storm since they finished and the basement walls are nice and dry. Nice work!
Peter V. | Falls Church, VA
Mauricio and Cristian were the initial sales reps who came to examine the issue and they took the time to test drainage that might have potentially been creating the water issue. They offered a reasonable solution (sealing the visible cracks and holes in the concrete) and I was contacted within a couple of days with an estimate and scheduling options. Sean was our tech and he did a fantastic job diagnosing the issue beyond just the cracks. He not only address all the holes and cracks in the concrete and mortar, he sealed up additional entry points above the foundation. He sourced additional materials to cover openings for cable lines. He went above and beyond and gave us measured information on how we should continue to monitor and treat this area as the house settles. He was thorough, informative, and provided excellent service in his work. I'm very glad that Sean was the technician sent to us and I would specifically request him for your projects.
Sara T. | Falls Church, VA
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Before & after photos
Check out before and after photos from some of our completed projects.


Sunken Concrete Step Repair in Stephens City, VA
This Stephens City, VA homeowner was dealing with a sunken concrete front step that had settled over time, creating an uneven entryway and a noticeable tripping hazard near the front door. Sunken concrete steps can make everyday foot traffic unsafe for homeowners, guests, and delivery drivers, while also taking away from the home’s curb appeal. Our concrete repair team lifted and leveled the front step back to its proper position, creating a safer, more stable walkway and entrance. This concrete step repair helped reduce the risk of falls, improved the look of the front entry, and gave the home a cleaner, more welcoming appearance. The homeowner was thrilled with the outcome — a big transformation that improved both safety and curb appeal!
Basement Waterproofing in Winchestor, VA
A homeowner in Winchester, VA, was struggling with a failing sump pump that couldn’t keep up during heavy rainstorms, leaving their basement vulnerable to water intrusion. The lack of a reliable backup system also left them worried about potential flooding during power outages. Frustrated and seeking a dependable solution, they contacted NV Waterproofing and Foundation Repair, a trusted basement waterproofing company in Winchester, VA.
After assessing the situation, we replaced their old sump pump with a state-of-the-art TripleSafe Sump Pump system. This advanced system includes three levels of protection: a primary pump, a secondary pump for heavy water flow, and a battery backup to ensure the basement stays dry even during power outages. The homeowner now has peace of mind knowing their basement is fully protected, no matter the weather.
Pool Deck Leveling in Manassas, VA
A homeowner in Manassas, VA, quickly realized their dream backyard pool was at risk when the surrounding concrete pool deck began to show serious problems. Uneven and sunken slabs created tripping hazards and unsightly cracks, making both safety and aesthetics a challenge for anyone using the space. Additionally, water from rain and pool use was pooling in low spots, causing slippery surfaces and further soil erosion beneath the deck. These issues not only threatened the safety of family and guests but also compromised the value and enjoyment of the home.
Seeking an effective solution, the homeowner reached out to our team for a professional assessment. We identified the main cause of settlement: soil erosion under the slabs—a common issue in Manassas due to its clay-rich ground and fluctuating moisture. To address both the immediate hazards and prevent future damage, we recommended our two-part approach: the cutting-edge PolyLevel® concrete leveling system and NexusPro® Joint Sealant.
The repair process began with drilling small holes into the affected concrete slabs, allowing us to inject high-strength PolyLevel® polyurethane foam beneath the surface. As the foam expanded, it filled voids, stabilized the soil, and gently lifted the slabs back to their original positions. The process was quick, clean, and minimized disruption, giving the pool deck a level, safe surface once again. PolyLevel® foam is waterproof and lightweight, reducing the risk of future settling and ensuring long-term durability, even in a wet poolside environment.
To provide further protection, we sealed all cracks and joints with NexusPro® Joint Sealant. This flexible, weather-resistant sealant prevents water from seeping beneath the slabs, protecting the soil and concrete from additional erosion. The result was a clean, finished appearance that not only improved the look of the deck but also safeguarded it for years to come.
Thanks to modern concrete leveling technology, the homeowner’s pool deck was transformed from a liability into a safe and attractive outdoor gathering space. The project was completed in a single day, with minimal mess and immediate results, giving the homeowner peace of mind and renewed pride in their backyard. If you’re facing similar issues with your pool deck in Manassas, VA, the PolyLevel® system and NexusPro® Joint Sealant offer a fast, effective, and lasting

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Frequently Asked Questions
Small cosmetic cracks may look easy to patch, but surface repairs don’t address the underlying cause. If a crack is growing, leaking or caused by foundation movement, a professional repair helps prevent added damage and repeat issues.
Foundation cracks can be an expected part of a home’s aging process. Hairline and small vertical cracks frequently result from concrete curing or minor settlement. However, horizontal, widening or leaking cracks may point to structural movement and should be professionally evaluated to find out whether repairs are needed.
Foundation crack repair costs vary depending on the crack type, its location and whether structural stabilization is needed. Repairs involving foundation settlement or bowing walls are generally more significant than cosmetic repairs. The best way to get an accurate estimate is with a free professional inspection.
Water entering through a foundation crack should never be ignored. While the crack gives water a way in, the underlying cause is often hydrostatic pressure or poor drainage around the foundation. Depending on what’s causing the leak, waterproofing or drainage improvements may also be recommended to help avoid future problems. A professional inspection can determine whether the crack, the drainage or both should be addressed to provide a long-term solution.
While some foundation crack types are harmless, some need attention right away. Cracks wider than ¼ inch, horizontal cracks, actively widening cracks, water leaks or cracks accompanied by sticking doors, sloping floors or bowing walls may indicate structural movement. Isolated, vertical hairline cracks are often cosmetic, but a professional inspection can confirm what’s behind it.
Horizontal foundation cracks are commonly caused by hydrostatic pressure or expanding soil bearing against foundation walls. Unlike many vertical cracks, horizontal cracks frequently indicate structural movement and may need wall stabilization. Depending on the severity, repairs may include CarbonArmor®, PowerBrace®, GeoLock® Wall Anchors or EverBrace®.
Vertical foundation cracks are usually caused by normal concrete shrinkage or minor settlement and usually aren’t structural. However, some may suggest continued movement or allow water to enter your basement. A professional inspection can determine whether the crack is cosmetic or whether the deeper foundation issue needs attention.
Related pages
Service Areas
NV Waterproofing has locations throughout Northern Virginia, D.C., and Suburban Maryland.
Resources
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Our Promise
At NV Waterproofing, we pride ourselves on providing permanent solutions, and stand behind our work with industry-leading, fully transferable warranties and guarantnees.






