Steady the Sagging Floor Over Your Crawl Space
Bouncy, sloping floors usually trace back to overspanned or weakened framing in the crawl space below. Epp Foundation Repair sets adjustable steel jacks on engineered footings to carry the load and stop the movement. Our goal is permanent stabilization, with some lift possible depending on conditions.
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A local specialist will inspect your foundation, walk you through the findings, and send a clear estimate, no cost, no pressure.
Crawl Space Jacks: how it works and when it's the right call.
A floor sags because the framing under it cannot carry its load over the distance it has to span. Wood beams and joists deflect under weight, and the longer the unsupported span, the more they bend. When a builder spanned a beam too far, or when crawl space moisture softened the wood, or when the original support post settled into soft soil, the floor above starts to dip, slope, and bounce. A crawl space jack interrupts that span. The steel post is placed under the sagging beam or directly under overspanned joists, shortening the distance the wood has to carry on its own. With a new support point in the middle of a long span, the framing flexes far less, and the movement stops. The part that makes or breaks the repair is the footing. A jack only works if the load it carries lands on something solid. Epp Foundation Repair pours or sets an engineered footing sized to the weight above and the bearing capacity of the soil, so the post does not push down into the ground over time. This is exactly where shortcut repairs fail. A jack screwed onto bare dirt or a single patio block sinks within a season and the floor sags again. Because the posts are adjustable, the crew can do two things. First, set the jack snug to carry the load and stop the deflection, which is the stabilization Epp guarantees. Second, where the framing and the home allow, slowly raise the post over days or weeks to bring a sagged floor closer to level, which is the lift Epp attempts but does not promise. Forcing a long-settled floor up too fast can crack drywall and finishes, so any lift is done gradually and only as far as the structure tolerates. The result is a floor that is supported, no longer bouncing or moving, and as close to level as the conditions safely allow.
Fixing Sagging Floor Joists with Post Beam Jacks
Our team walks through this on camera.
How we install crawl space jacks.
Step 01.Floor and Framing Diagnosis
Epp Foundation Repair maps the slope and bounce in the floor above, then inspects the beams, joists, and existing support posts in the crawl space. The crew identifies the overspanned or weakened framing and checks the soil where new footings will go, sorting the work into Must Do, Strongly Suggest, and Monitor.
Step 02.Footing Preparation
The crew excavates and pours or sets an engineered footing sized to the load and the soil bearing capacity at each jack location. This is the step shortcut repairs skip, and it is the reason a jack on bare dirt fails. A solid footing is what keeps the support from sinking.
Step 03.Jack Installation and Load Transfer
Epp sets each adjustable steel jack on its footing beneath the sagging beam or joists and brings it up snug to carry the load. The framing stops deflecting at that point. This is the stabilization the company guarantees, achieved before any attempt at lift.
Step 04.Gradual Adjustment and Verification
Where conditions allow, the crew raises the adjustable posts slowly over time to bring the floor closer to level, watching the finishes above so nothing cracks. Epp confirms the floor is supported and stable, documents the work with photos, and notes how the posts can be tuned later.
"I'll tell you the same thing I tell every homeowner with crawl space mold: you need two trades, not one. We're one of them. We fix the water. A certified remediator removes the mold. If you skip our part, the mold comes back inside of a season. If you skip theirs, you've got dry wood with dead and live mold colonies still on it. Both trades or it doesn't actually solve the problem."
Care and expertise from a team that's been doing this since 1994.
Epp Foundation Repair is locally owned and operated, with crews dedicated exclusively to foundation, basement, and concrete work across the Midwest.
Foundation repair, waterproofing, and concrete leveling are our entire focus, not a sideline.
Three decades of experience with Midwest soils, basements, and weather conditions.
Recognized in 2011 and 2016 for ethical business practices and customer transparency.
Every repair comes with a written Epp warranty, from 1 year to the lifetime of the structure depending on the product.
Answers to common questions about Crawl Space Jacks.
Don't see your question here? Our team is happy to help. Reach out anytime.
Crawl Space Repair warning signs this solution resolves.
Each problem sign below is a symptom this solution is engineered to fix. See how we diagnose it before we recommend this method.
Crawl Space Mold
Epp Foundation Repair has diagnosed crawl space moisture conditions across Nebraska, Iowa, Kansas, and Missouri since 1994. Mold spores exist in every crawl space. They only colonize when humidity stays above 60% for 48 hours or more.
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Deteriorating Insulation
Fiberglass batts drooping between your floor joists or falling to the crawl space dirt. The insulation itself is the symptom. The cause is humid air and ground moisture that the insulation can no longer hold back.
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Groundwater Seepage
Epp Foundation Repair has been installing interior crawl space drainage and sump systems across Nebraska, Iowa, Kansas, and Missouri since 1994. The only permanent answer to seepage driven by a high spring water table.
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High Energy Bills
Heating and cooling costs creeping up while your thermostat stays the same. A damp, vented crawl space pulls in outside air and lets conditioned air leak out through the floor. Your system runs longer to make up the difference.
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Moisture in Crawl Space
Epp Foundation Repair has been encapsulating crawl spaces across Nebraska, Iowa, Kansas, and Missouri since 1994, dropping relative humidity from 75%+ down to a stable 50 to 55%. The threshold where mold cannot colonize.
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Musty Odors
Epp Foundation Repair has traced musty odor complaints to crawl moisture in Nebraska, Iowa, Kansas, and Missouri homes for more than 30 years. The stack effect pulls a large share of the air you breathe upstairs from the crawl below.
Learn moreServing Nebraska, Iowa, Kansas & Missouri.
Local crews based in five regional offices, dispatched daily across four states. If your town isn't listed, call us: we likely serve your area.
- Omaha, NE
- Lincoln, NE
- Topeka, KS
- Sioux City, IA
- Bellevue, NE
- St. Joseph, MO
- Council Bluffs, IA
- Grand Island, NE
- Papillion, NE
- Kearney, NE
Take the first step toward a healthy home.
A straightforward path from initial inspection to completed repairs.
Schedule your inspection.
A local specialist visits your home, evaluates the foundation, and answers your questions on site. No cost, no obligation.
Receive an estimate based on your needs.
We provide a clear, Customized Repair Estimate with a scope of work tailored to your home's specific issues. Typically within one business day.
Get your repairs.
Our own trained crews complete the work on schedule and back it with a written Epp warranty, set out in your contract.
Over 1,700 homeowners have shared their experience.
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Schedule your inspection in seconds with our Driive booking tool, or share a few details and a local specialist will follow up within one business day.
- A local foundation specialist on site
- A complete walk-through of the findings
- A Customized Repair Estimate within one business day
- No cost, no obligation, no high-pressure sales
Expert guidance on protecting your home.
Practical articles from the Epp team on foundation health, waterproofing, and home preservation.
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Five regional offices across the Midwest.
St. Joseph, MO 64506

