Home to the world-famous Knoxville Raceway, this Marion County seat sits on rolling, clay-rich hills that drain toward Lake Red Rock. JLB delivers foundation repair and basement waterproofing built for Knoxville's erosion-prone terrain.
Get a precise analysis of your foundation and waterproofing situation, and a clear estimate on what any fixes or corrections might cost.
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JLB Foundation Repair is a local company — not a franchise. We serve Knoxville and the surrounding Des Moines metro with foundation repair, waterproofing, crawlspace encapsulation, and drainage solutions. Watch to learn who we are and how we work.
On Knoxville's rolling hills south of Lake Red Rock, the same clay-rich ground that erodes with seasonal runoff also shifts beneath older downtown stone foundations and mid-century block basements. JLB stabilizes those homes with steel push and helical piers driven to load-bearing strata, then anchors and re-plumbs walls that have settled or cracked as the slopes drain.
How we do it: foundation repair at JLB.
Because so much of Knoxville sits on terrain that funnels runoff toward Lake Red Rock, hillside basements and aging block walls take on water through cracks and floor-wall joints. JLB cures the problem from the inside: interior drain tile around the footing, a sump basin with battery backup, and injected sealing of every active crack so the clay's seasonal swelling stays out of finished space.
How we do it: basement waterproofing at JLB.
Many of Knoxville's stone-foundation and crawlspace-built homes trap humid air that rolls in off the surrounding clay hills, feeding mold, rot, and musty floors above. Rather than treating half the house, JLB closed-cell spray foams both the crawlspace and the basement, sealing two moisture pathways at once for stronger protection than the single-zone job most competitors quote.
How we do it: crawlspace encapsulation at JLB.
Knoxville's sloped lots send stormwater sheeting downhill toward Lake Red Rock, pooling against foundations on the low side of a property. JLB intercepts it with buried French drains and surface channels, regrades the soil to pitch water away from the house, and extends downspout runs so roof discharge exits well past the foundation instead of soaking the clay beside it.
How we do it: french drains & drainage at JLB.
When a Knoxville basement wall has bowed past saving, often an aging stone or block run undermined by years of hydrostatic pressure from the hillside clay, repair is no longer enough. JLB excavates and rebuilds it as a steel-reinforced poured concrete wall, footed below the regional frost depth so Iowa's repeated winter freeze-thaw can't heave the new structure.
How we do it: foundation wall replacement at JLB.
Two Ways to Pay Over Time
12 Months Same As Cash
Pay the full balance within 12 months and you pay no interest.
5 Years at 6.99% APR
A lower monthly payment, spread over 60 months.
On approved credit. Ask for full terms at your free estimate.
The housing stock in Knoxville dates primarily to the Diverse: historic downtown core with stable residential growth from the mid-20th century.. Most homes sit on stone foundation and concrete block basement and crawlspace foundations — construction methods that were standard for the era but weren't designed to handle the soil movement we now understand. Soil erosion and settlement are common in Knoxville due to the rolling terrain and seasonal runoff heading toward Lake Red Rock. When the damage shows, homeowners here need how steel piers stop homes from settling.
South of Lake Red Rock; rolling hills and clay-rich soils. For many homes, interior water management that works every season is the first step.
What each warning sign means and how we fix it: foundation repair, waterproofing, and crawlspace encapsulation.
Numbers That Speak for Themselves
Foundations built before the 1950s have been absorbing soil pressure for over 70 years. If your Knoxville home is showing cracks, sticking doors, or basement moisture, a free estimate tells you exactly what's going on — before it gets expensive.
Not Sure What You're Dealing With?
Click any symptom below to learn what it means, what's likely causing it, and how we can help. Most of these are more common — and more fixable — than you'd think.
Diagonal, stair-step, or horizontal cracks in drywall, plaster, or brick usually trace back to soil movement beneath your foundation. The heavy clay soils in the Kansas City and Des Moines metros expand and contract seasonally, which can shift your foundation over time. The good news: this is very fixable with the right approach.
Water entering through floor joints, wall cracks, or seeping through porous concrete means groundwater pressure is pushing moisture into your basement. An interior drainage system and sump pump can solve this permanently — and we can usually have it done in a day or two.
When a foundation settles unevenly, it can shift your home's frame just enough to make doors and windows bind. This is one of the earlier signs of foundation movement — and catching it early often means a simpler, less expensive repair.
That musty smell is moisture. Up to 40% of the air in your home rises from below — from your crawlspace and basement. If there's excess humidity down there, it affects your whole home. Encapsulation seals it out, and you'll notice the difference in your air quality right away.
Floors that slope toward the center or an exterior wall usually mean the support structure underneath needs attention. Push piers can stabilize your foundation and often lift it back to level — giving your floors a second life.
Water collecting near your foundation means your grading or drainage isn't directing water away effectively. French drains, regrading, extended downspouts, and drain pipes can redirect water away from the house — protecting your foundation for the long haul.
A basement wall that has bowed more than 2 inches inward, shifted off its footing, or shows multiple structural cracks may have moved beyond what bracing can fix. When carbon fiber straps, I-beams, or wall anchors are not enough, the wall needs to be removed and rebuilt with reinforced concrete. This is the last resort — but it is the permanent fix when the wall itself is compromised.
What Our Customers Say
"We had cracks running up our walls and doors that wouldn't close. JLB came out, explained exactly what was happening with the soil under our house, and had the piers installed in two days. Floors are level again. Wish we hadn't waited so long."
"Three other companies gave us the runaround. JLB showed up, did a thorough inspection, and gave us a straight answer. The repair held up through an entire Missouri winter with zero new cracking."
"Our crawlspace was a mess — moisture, mold, the works. JLB encapsulated it AND spray-foamed our basement in the same project. The difference in our home's air quality is incredible. Great value for the price."
Real Projects. Real Results.
Every photo is from an actual JLB job site — not a stock photo. See the work we do every day across Kansas City and Des Moines.
Two Ways to Pay for It
12 Months Same As Cash
Pay the full balance within 12 months and you pay no interest.
Best if you can pay it off within a year.
5 Years at 6.99% APR
A lower monthly payment, spread over 60 months.
Best for bigger projects.
On approved credit. Ask for full terms at your free estimate.
Foundation repair costs in Knoxville vary widely based on the scope of damage and the solution needed. Minor crack repairs may cost $500-$2,000. Pier installation for settling foundations typically ranges from $5,000-$15,000. Full waterproofing systems run $3,000-$12,000. We provide free estimates with detailed, written estimates — no surprises and no pressure.
A JLB technician visits your Knoxville home and examines the foundation inside and out — checking for cracks, wall movement, floor levelness, moisture, and drainage. For stone foundation foundations common in Marion County, we look for the specific failure patterns associated with that construction type. The inspection takes about 45 minutes and ends with a clear explanation of what we found, what (if anything) needs repair, and exactly what it costs. There's no obligation.
Knoxville's older stone foundations need specialized attention. Fill out the form and a foundation specialist will contact you within 24 hours to schedule a free, no-obligation estimate.
Our Locations
We're always close enough to help — our crews are local to your area.
Stop the Damage. Get Answers Today.
A free estimate takes 45 minutes and tells you exactly what's going on under your house — and exactly what it takes to fix it.
