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Crawl Space Jacks2026-11-02T15:29:43-06:00

Crawl Space Support Jacks in [Target Location]

Crawl space jacks provide permanent structural support for sagging, bouncy or unlevel floors in [Target Location].

What Are Crawl Space Jacks?

Crawl space jacks are adjustable steel posts installed under beams, girders and joists to stabilize sagging, bouncy or unlevel floors. These crawl space jack posts transfer structural loads to stable footings below as part of an engineered crawl space repair system.

Some floors may sit on wood posts, masonry columns or other supports that can break down, settle or move over time. Adjustable crawl space jacks replace or add to inadequate supports to restore dependable crawl space structural support.

Symptoms

Signs Crawl Space Support Is Needed

Problems with the beams, floor joists or supports in a crawl space often show up in the floors and finishes above. Indications that the floor system may need additional structural support include:

  • Sagging or pitched floors
  • Bouncy or uneven floors
  • Separation between floors and walls
  • Cracks in drywall or interior finishes
  • Doors or windows that bind
  • Deteriorated support posts or framing: Rot, corrosion or other deterioration can limit the ability of existing components to support the floor system.
  • Settled or shifting piers and posts: Existing supports can settle or move, leaving beams and floor joists without adequate support.
  • Changes to building loads: Remodels, equipment or other added loads may require more support than the existing floor system provides.

These conditions don’t automatically mean more jack posts are needed. A structural evaluation can determine the cause of the movement and determine whether crawl space support jacks, framing repairs or a different solution is appropriate.

SmartJack® Capacity & Performance

  • Built to Support Significant Structural Loads

    Engineered Load Ratings

    The SmartJack® system uses engineered steel components designed to transfer loads from the beam or girder above to the supporting soils below. The assembled steel components carry an allowable system capacity of 30 kips (30,000 pounds). Actual allowable loads for an installed system depend on the supporting soils, footing design and other site conditions.

    • 30-kip allowable capacity of assembled steel components
    • Designed for axial compression loads
    • Supports beams, girders and joists
    • Engineered steel components specified for structural support

  • System Capacity Involves More Than the Jack Post

    Support from Structure Down to Soil

    A crawl space support system is only as effective as the ground supporting it. While SmartJack steel components carry a 30-kip allowable capacity, actual allowable loads may be limited by the bearing capacity of the underlying soil. Correct footing design helps distribute structural loads and limit the potential for settlement.

    • Carries loads through the post and footing into supporting soils
    • Footing requirements can be designed around site conditions
    • Factors in soil bearing capacity when determining allowable loads
    • Provides a full load path instead of relying on the post alone

  • Stabilization with the Ability to Make Controlled Adjustments

    Adjustable Steel Support Posts

    SmartJack support posts feature an adjustable connection that allows the system to be tightened during installation. When conditions allow, controlled adjustments may also help improve sagging or uneven floor areas. The system can be adjusted down the road if additional correction is appropriate.

    • Can be adjusted during installation
    • Can help stabilize sagging beams and floor joists
    • May allow floors to be raised toward a more level position
    • Can be readjusted if conditions call for it

How Crawl Space Jack Installation Works

1.

Inspect the Floor System

Review the beams, floor joists, existing supports and areas of sagging or movement to understand the structural conditions.

2.

Determine Support Locations

Determine where SmartJack® support posts are needed based on the floor framing, existing supports and load requirements.

3.

Build the Base

Dig out each support location and install the specified aggregate base and footing to spread loads into the supporting soil.

4.

Install the SmartJack® System

Position and secure the adjustable steel support posts beneath the beam or girder to establish a load path from the floor system down to the footing below.

5.

Adjust & Verify Support

Make controlled adjustments to stabilize the floor system and, when conditions allow, help lift sagging areas toward a more level position.

Why Choose SmartJack® Over Other Crawl Space Support Posts?

Not all posts installed beneath a floor system offer the same level of support. Wood posts, masonry piers and temporary jack posts can deteriorate, settle or lack the footing and load capacity needed for long-term structural support.

The SmartJack® system brings together engineered steel support posts, adjustable connections and properly designed footings to create a complete load path from the floor framing to the supporting soil.

Engineered Steel Parts
SmartJack® is built as a structural support system rather than an improvised or temporary floor support.

Support You Can Adjust
The system can be adjusted during installation to stabilize the floor framing and, when conditions allow, help lift sagging areas toward a more level position.

Designed for the Load Below
SmartJack® footings distribute structural loads to the supporting soil, which helps address one of the common causes of settled or inadequate crawl space supports.

Crawl Space Support You Can Trust in [Target Location]

The right approach to crawl space support starts with understanding the structure and what is causing the floor system to sag or move. NV Waterproofing and Foundation Repair evaluates the beams, floor joists, existing supports and load conditions to identify where additional support is needed and recommend the appropriate repair.

Contact NV Waterproofing and Foundation Repair to set up an evaluation and get a recommended crawl space support solution for your building.

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Customer Information

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

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

View All Before & Afters

Our service area

Proudly Serving Northern Virginia, D.C., and Suburban Maryland

Crawl Space Jacks FAQs

How much do crawl space jacks cost?2026-10-06T13:42:28-05:00

Cost depends on the number of SmartJack® supports needed, their placement and height, footing requirements, crawl space access and whether beams, joists or other structural components also need repair. NV Waterproofing and Foundation Repair can evaluate the floor-support system and provide pricing based on the recommended repair design. 

Can a building remain occupied during crawl space jack installation?2026-10-06T13:41:43-05:00

Usually, yes. Because SmartJack® installation is typically performed from within the crawl space, extensive demolition of the occupied space above may not be necessary. Access requirements, structural conditions and the repair scope determine whether any areas of the building need to be temporarily restricted. 

How long does crawl space jack installation take?2026-10-06T13:41:10-05:00

Installation time depends on the number of supports, crawl space access, existing framing, footing requirements and whether other structural repairs are needed. Many projects can be finished with relatively limited disruption because the work takes place primarily within the crawl space. 

Can crawl space jacks replace rotted wood posts?2026-10-06T13:40:36-05:00

Yes, crawl space support jacks may be used to replace deteriorated wood posts when they are part of the building’s support system. Any rot or damage in the beams or joists being supported should also be addressed, since installing a new post does not repair damaged framing.

Do crawl space jacks need concrete footings?2026-10-06T13:39:55-05:00

Crawl space jacks need a properly designed base to spread loads into the soil, but that doesn’t always mean a traditional poured concrete footing. SmartJack® installations can use engineered footing configurations chosen according to the loads and site conditions. 

How many crawl space jacks are needed?2026-10-06T13:39:14-05:00

There is no set number. The quantity and spacing depend on framing, beam spans, loads, existing supports and the capacity of the soil and footings below. An evaluation is needed to determine the appropriate number and placement of support posts for the project. 

Can SmartJack® supports be adjusted later?2026-10-06T13:38:36-05:00

Yes. SmartJack® support posts feature an adjustable connection that allows controlled adjustments during installation and, when appropriate, at a later date. That can be useful if additional correction of the supported floor system is needed. 

Are crawl space jacks permanent?2026-10-06T13:37:57-05:00

Yes. SmartJack® is engineered as a permanent structural support system. Unlike temporary jack posts or makeshift supports, it pairs engineered steel components with a footing designed to transfer loads from the floor framing to the supporting soil. 

Can crawl space jacks level a sagging floor?2026-10-06T13:37:15-05:00

Yes, in many situations. SmartJack® supports can be adjusted to help raise sagging beams and floor framing toward a more level position while stabilizing the floor system. How much correction makes sense depends on the condition of the framing, the amount of movement and other structural considerations. 

How do crawl space jacks work?2026-10-06T13:36:33-05:00

Crawl space jacks are installed under beams or girders to provide additional support for the floor system above. The post transfers structural loads downward through a footing and into the supporting soil. SmartJack® posts are adjustable, letting the system be tightened and the floor framing stabilized during installation. 

How much weight can a SmartJack® support?2026-10-06T13:35:47-05:00

The assembled steel components of the SmartJack® system have an allowable capacity of up to 30 kips, or 30,000 pounds. That said, the allowable load for an installed system also depends on factors such as soil bearing capacity, footing design, post height and overall project conditions. Each application should be evaluated based on the structure and loads being supported.

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NV Waterproofing has locations throughout Northern Virginia, D.C., and Suburban Maryland.

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At NV Waterproofing, we pride ourselves on providing permanent solutions, and stand behind our work with industry-leading, fully transferable warranties and guarantnees.

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