Vienna, VA’s Trusted Basement Waterproofing, Foundation & Crawl Space Contractor

Our Solutions

  • Basement Waterproofing in Vienna

    Whatever the cause of your wet basement, NV Waterproofing & Foundation Repair has a solution. If your basement floods in heavy rain, or is always damp and musty, our waterproofing and moisture control solutions could help. If your sump pump or drainage system aren’t working like they should, we can recommend a better option. We’re homeowners too. That’s why we only install products that we know work.

    • Multi-pump, cast-iron, submersible sump pump systems with built-in high water level alarm
    • Battery backup pumps for continuous operation and protection in power outages
    • Clog-resistant interior drainage channel – Collects water from walls and drains it away before it reaches the floor
    • High-efficiency SaniDry dehumidifiers – No water buckets to empty and has a built-in air filter to trap mold spores and dust
  • Crawl Space Encapsulation & Repair in Vienna

    Did you know that your crawl space could cause musty odors and cold floors upstairs? If you have a vented crawl space with moisture, mold, mildew, rot, or pest problems, we can help.

    At NV Waterproofing & Foundation Repair, we use the CleanSpace encapsulation system to seal your crawl space from outside air. This will help stop moisture and mold problems.

    We offer a variety of crawl space solutions, including:

  • Warrantied Foundation Repair in Vienna

    Foundation problems only get worse over time. If you notice cracks in your foundation, basement walls that are bowing or any other sign that something’s not right, let one of our foundation specialists take a look – you’ll be glad you did. The sooner you take care of your foundation, the less money it will cost you in future repairs.

    Some common signs of foundation problems are:

    • Sagging floors and floor cracks
    • Wall cracks
    • Bowing walls
    • Sticking doors and windows
    • Tilting chimneys

    With patented helical piers, push piers, wall anchors and crawl space jacks, we can handle any foundation problem. Normal settlement can cause foundation cracks, but they could also mean a serious structural problem.

    We never recommend a solution that you don’t need. Our goal is to educate you on all the options and let you choose the best solution for your needs and budget.

    To schedule your in-home consultation with a free written estimate, contact us today! We offer our basement waterproofing, crawl space repair and foundation repair services in Vienna, VA and the surrounding areas.

Reviews

See what our customers have to say about our work.

Schedule your free inspection—

It’ll only take
a minute

Meet with a trusted expert, and get
clear answers about your home.

"*" indicates required fields

1Your Info
2Schedule Your Inspection
3Review & Submit

Customer Information

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 & 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

Making headlines

Thrasher blog

Nothing Found

Ready to get started?

Schedule a free estimate to start your repair journey with Thrasher.

Schedule your inspection

Fill out our form or give us a call to book your inspection. Share what you’ve noticed so we can send the right expert to your home.

Full home
inspection

An expert will inspect the problem area and surrounding conditions, including soil movement, drainage, structural integrity, and any related concerns.

Clear explanation
of findings

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.