Professional Concrete Repair & Foundation Repair Company in Alexandria, VA

Do you have a leaky basement, damp crawl space, foundation cracks, or sunken concrete in your Alexandria home? Whether in Del Ray, Old Town, Rosemont, Cameron Station, or Beverley Hills, NV Waterproofing & Foundation Repair is your trusted local expert. Since 1986, we’ve proudly helped homeowners throughout Northern Virginia protect their properties with reliable, warrantied solutions.

Our award-winning team understands the unique challenges that come with Alexandria homes—whether it’s the older brick foundations in Old Town or high water tables in Rosemont. We specialize in historic home foundation repair, masonry foundation repair, and brick foundation repair, delivering solutions that preserve structural integrity while respecting the character of older homes. You’ll get expert diagnostics, proven products, and timely service from crews who know the area well.

Why Homeowners in Alexandria Choose Us:

  • Transferable Lifetime Warranty on Basement Waterproofing Systems
  • 25-Year Warranty on Foundation & Crawl Space Repairs
  • Proven Concrete Leveling & Crack Repair Systems
  • Same-Day Financing Available
  • Local Expertise with Decades of Alexandria Project Experienc

Our Solutions

  • Foundation Repair in Alexandria, VA

    Are you seeing stair-step cracks in your brick? Doors that won’t close? Many Alexandria homes sit on expansive clay soils that swell and shrink with moisture, causing foundation settlement or bowing walls. In areas like Rosemont and North Ridge, we often see foundation issues tied to aging homes and poor soil compaction during original construction. Homes with older construction—especially those with stone or brick foundations—often require specialized masonry foundation repair or brick foundation repair techniques to ensure long-term stability. No matter what the cause of your foundation problems, early action can save you thousands in future repairs.

    Our comprehensive foundation repair solutions:
    • Wall anchors for bowing or leaning basement walls
    • Helical & push piers to stabilize and lift settling foundations
    • Crawl space support jacks to level sagging floors
    • Crack repair and wall reinforcement
    • Historic home foundation repair
    • Masonry foundation repair
    • Brick foundation repair

    Alexandria Foundation Repair Project Spotlight: A homeowner in Old Town Alexandria noticed widening wall cracks and doors sticking throughout the house. After a free evaluation, we installed helical piers to stabilize the foundation and wall anchors to straighten a bowing basement wall. The structure was restored—and so was the homeowner’s peace of mind.

    If you see wall cracks or other signs of foundation issues, contact us today for a free inspection and estimate in Alexandria or nearby!

  • Concrete Leveling & Repair in Alexandria, VA

    Uneven sidewalks? Sinking driveways? Cracked concrete around your home isn’t just an eyesore, but it can be a safety hazard and a sign of underlying soil issues. In Alexandria, shifting soils and changes in moisture can cause concrete slabs to settle, crack, or become uneven over time. Our team uses advanced, non-invasive solutions to restore your concrete quickly and effectively—without the mess or expense of full replacement. With PolyLevel® concrete leveling, we lift and stabilize sunken slabs, while NexusPro® joint sealant protects against water intrusion and future damage.

    Our concrete repair solutions include:
    • PolyLevel® injection system to lift and level sunken concrete slabs
    • NexusPro® joint and crack sealant to prevent water infiltration
    • SealantPro® concrete sealant to protect your concrete
    • Driveway, sidewalk, patio, and pool deck leveling and repair
    • Fast-curing materials that are ready for use in hours, not days
    • Long-lasting, weather-resistant solutions designed for Virginia’s climate

    Alexandria Concrete Repair Project Spotlight: A homeowner in Rosemont had a sunken driveway and uneven walkway that created a tripping hazard. We used PolyLevel® to lift and level the slabs and sealed the joints with NexusPro®, restoring safety and curb appeal in just one day.

    If you’re dealing with cracked or uneven concrete, contact us today for a free inspection and estimate in Alexandria or nearby!

  • Basement Waterproofing & Leak Repair in Alexandria, VA

    Are you experiencing flooding in your basement after a heavy storm, leaky foundation walls, or pooling water in your crawl space? Alexandria’s dense clay soil and proximity to the Potomac River can lead to poor drainage, especially in neighborhoods like Old Town, where historic homes may lack modern waterproofing.

    We’ll evaluate the source of the water intrusion—whether it’s a failed sump pump, hydrostatic pressure, or surface runoff—and design a custom waterproofing solution that keeps your basement dry for good.

    Our waterproofing systems include:
    • Dual-pump, cast-iron sump pump systems with built-in water level alarms
    • Battery backup pumps for protection during power outages
    • Clog-resistant interior drainage channels move water away from walls
    • Energy-efficient SaniDry™ dehumidifier designed to eliminate moisture, mold, and musty odors
    • High-performance Aspen Air Purifier to efficiently clean your indoor air

    Alexandria Basement Waterproofing Project Spotlight: A homeowner in Del Ray struggled with basement flooding during rainstorms. We installed an interior drainage system with a triple-safe sump pump and vapor barrier, transforming the damp space into a dry, usable area. Check out the before/after photos in our project gallery!

  • Crawl Space Encapsulation & Repair in Alexandria

    Musty smells? Cold floors in the winter? These are signs that your crawl space might affect your comfort and air quality. Many Alexandria homes—especially in areas like Del Ray, Rosemont, and Old Town—have vented or unsealed crawl spaces prone to moisture, mold, and structural issues due to Virginia’s humid climate.

    Our crawl space repair solutions:
    • CleanSpace® vapor barrier – 25-year warranty against rips and tears
    • SaniDry™ dehumidifiers – High-performance design for efficient humidity control
    • Sump pump systems – Keep standing water out for good
    • Support jacks – Stabilize sagging floors
    • Airtight doors and vent covers – Helps seal out moisture and deter pests

    Encapsulating your crawl space helps eliminate musty odors, improves indoor air quality, and makes your home more energy-efficient year-round. Contact us today for a free crawl space inspection and estimate in Alexandria or nearby!

    Recent Crawl Space Repair Project in Alexandria: We helped a Seminary Ridge homeowner turn their damp crawl space into a clean, dry, insulated area—resulting in warmer floors and lower utility bills.

Contact us today for a free estimate in Alexandria, VA

If you need help with basement waterproofing, foundation repair, crawl space encapsulation, concrete leveling, moisture control, or indoor air quality improvements in Alexandria or nearby, get started by scheduling a free, no-obligation estimate today and discover why Alexandria homeowners trust NV Waterproofing & Foundation Repair with their biggest investment—their home. We can protect your property from the ground up!

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The Thrasher Promise

No matter the job – we aren’t going to feel good about the hard work we’ve done until you’re happy. So we’ll do it right or make it right. That’s the Thrasher promise.

For the last 45 years in the basement and foundation repair industry, we’ve focused on the value of doing whatever it takes to get the job done and “wow” our customers every step of the way.

Our promise to you:

An experience so remarkable you’ll give us a five-star review.

Before and After Pictures from Alexandria, VA

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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