Foundation Repair & Basement Waterproofing in Sioux City, IA

Does your home or commercial property have bowing foundation walls, sinking concrete slabs, leaky windows in the basement, or clogged gutters? There is no reason to worry — Thrasher Foundation Repair is your trusted expert, providing solutions for these problems and so much more since 1975.

Contact Thrasher Foundation Repair to schedule a free inspection and cost estimate on any of our reliable services, including basement waterproofing, foundation repair, crawl space encapsulation, concrete repair, and gutter installation. We proudly serve Sioux City, IA and nearby areas.

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Testimonials From Sioux City
I selected Thrasher because of high humidity levels and mold in our basement. We also had water coming in through the walls and ground.
Testimonial by Kari W. from Sioux City, IA
We called Thrasher because we understand that we need to do something to keep the problem from getting worse. Charles (sales rep) did an excellent job. We...
Testimonial by Connie G. from Sioux City, IA
I'm sure other companies have similar products but I'm more likely to go with the company that is locally based and has knowledgeable and kind staff
Testimonial by Ashley P. from Sioux City, IA
Reviews From Sioux City
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Durable foundation repairs in Sioux City

No matter how small the foundation damage may seem, problems can worsen and impact other areas of a home or building, leading to issues like sticking windows and doors, cracked drywall, a tilting chimney, and moisture intrusion. From cracked foundation floors to bowing basement walls and foundation settlement, Thrasher Foundation Repair provides permanent solutions for these structural problems and more.

Foundation Problems We Fix:

  • Foundation settlement & sinking
  • Sticking windows & doors
  • Tilting chimneys
  • Tilting & bowing walls
  • Cracked foundation walls & floors
  • Collapsing retaining walls
  • Sagging crawl space
  • Uneven floors

Our Foundation Repair Products:

  • Crawl space support posts
  • Push piers & helical piers
  • Wall anchors
  • Street creep repairs
  • Foundation wall brace & beams
  • Carbon fiber wall straps
  • Foundation settlement repair
  • Foundation crack repair

Schedule a free foundation inspection and service estimate to get personalized repair solutions for your property. We proudly serve Sioux City and nearby areas in Iowa.

Lasting basement waterproofing system in Sioux City

If your home or building has leaky egress windows, damp walls, excess condensation, mold, or other moisture intrusion problems, contact the basement waterproofing experts at Thrasher Foundation Repair.

We can eliminate basement flooding and leaking with a patented waterproofing system customized to suit any property, creating a dry below-grade space and keeping it that way for years to come! We proudly serve Sioux City and nearby areas in Iowa.

Schedule a free basement waterproofing inspection and service estimate to learn more. We proudly serve Sioux City and nearby areas in Iowa.

Our basement waterproofing system includes:

  • Interior drainage systems
  • Sump pumps
  • Replacement egress windows
  • Window wells
  • Mold treatment
  • Dehumidifiers

Crawl space repair & encapsulation services in Sioux City

Do you have a musty, wet, and humid crawl space in your home or building? Don’t deal with the mess on your own. Contact the crawl space encapsulation and repair professionals at Thrasher Foundation Repair! We provide a suite of crawl space solutions designed to create a drier, more secure area, including a moisture-proof vapor barrier, crawl space doors, crawl space support jacks, and more.

Concrete repair & concrete leveling experts in Sioux City

If you’re tired of sinking, cracked driveways, pool decks, sidewalks, or other concrete slabs around your property, contact the concrete repair professionals at Thrasher Foundation Repair. We offer simple, innovative solutions that are far superior to the standard mudjacking or concrete replacement. Our cracked concrete repair, concrete leveling, and concrete sealing systems install with no mess and no stress. Plus, they are quick to cure, so you can use your slabs soon after installation.

Never worry about UV rays, debris, gas, water, or other liquids ruining your slabs. Our solutions are incredibly durable and address the underlying cause of concrete damage, meaning you get lasting results that save you money!

Schedule a free concrete repair estimate to learn more. We proudly serve Sioux City and the surrounding areas.

Our concrete repair solutions:

  • PolyLevel®® concrete leveling
  • NexusPro™ cracked concrete repair
  • SealantPro™ concrete sealing
  • Commercial concrete repairs
  • Driveway repairs
  • Pool deck leveling
  • Sidewalk repairs
  • Step repairs

Durable aluminum gutters, downspouts, & gutter guards in Sioux City

Creating a dry, secure property starts with having the best gutter system. If you have leaky gutters that easily clog or sag under heavy loads, then the water that spills over can ruin roofing, siding, landscaping, and even seep into the home or building through the foundation. That is why Thrasher Foundation Repair offers the Gutter Shutter system, guaranteed to never clog, sag, or pull away.


The Thrasher Difference.

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.

Explore The Thrasher Difference

Before and After Pictures from Sioux City
Settling Foundation in Sioux City, IA Saved with Push Piers

Settling Foundation in Sioux City, IA Saved with Push Piers

Before After
Settling Foundation in Sioux City, IA Saved with Push Piers Settling Foundation in Sioux City, IA Saved with Push Piers

Evan G.’s home was settling, and he was having trouble with doors shutting properly and cracking in the drywall. Looking for a long-term solution to stabilizing his home, his son recommended to have Thrasher come out and take a look.

We sent Service Technician, Matthew George out to the home. His was able to identify that the westers corner of his home was settling into the ground, which was causing problems inside the home. Cracks were also starting to appear in the floors and back patio. We were able to install Push Piers and attach them into the footings of the home to permanently stabilize the foundation and prevent further settlement.

Two Part Concrete System Levels Driveway in Sioux City, IA

Two Part Concrete System Levels Driveway in Sioux City, IA

Before After
Two Part Concrete System Levels Driveway in Sioux City, IA Two Part Concrete System Levels Driveway in Sioux City, IA

Homeowner Tonya H. had plans to replace her concrete after major settlement and cracking had happened. She was concerned about water getting through the concrete and entering her basement. After hearing that there were other solutions to saving her concrete, she decided to call Thrasher.


System Design Specialist Jon Young went out to Tonya’s home. He was able to identify that a 2-part concrete protection system would fix the concrete and she didn’t need to go through the hassle of replacing concrete. The crew started with PolyLevel, which was able to lift and level the concrete back up to the original height. Then the crew used NexusPro Joint Sealant to seal and prevent water from entering the joints.  Tonya was thrilled with how her concrete looked and how easy this solution was instead of replacing the concrete.

Concrete problems resolved in Sioux City, IA

Concrete problems resolved in Sioux City, IA

Before After
Concrete problems resolved in Sioux City, IA Concrete problems resolved in Sioux City, IA

Rori S. takes great pride in how her home looks. She has been dealing with ugly concrete slabs for a while. She had someone she knew attempt to repair them for her and they settled again. She didn't want to spend any more time and money on them and wanted something that will permanently fix the issue making her home look good and maintaining its value

The back patio gets a lot of water and she never wanted to deal with those issues again. We lifted and leveled the areas she was struggling with. On the driveway we put in CompressionGuard to prevent damage from street creep and sealed all cracks in joints to prevent water from saturating the soil.  

Basement in Sioux City, IA Waterproofed

Basement in Sioux City, IA Waterproofed

Before After
Basement in Sioux City, IA Waterproofed Basement in Sioux City, IA Waterproofed

Marcy A. is looking to remodel the basement but has been dealing with water coming in throughout the last couple of years. She removed some paneling and noticed that water as also coming in from the concrete walls.  Before starting the remodeling, she wanted to get the water to stop coming in. After getting recommendations from family about Thrasher, they decided to give us a call.

System Design Specialist Jordan Comstock went out to Marcy’s home. He was able to find that the water was coming in through the cold joints and form ties. The water was also building up along the foundation walls.  We waterproofed the area with WaterGuard and installed full height CleanSpace. Marcy was happy to be able to continue with the remodeling and to never have to worry about water coming in again!

Case Studies From Sioux City
The foundation of a building on the campus of Western Iowa Tech Community College (WITCC) was in trouble. One end of the building seemed to be...
The garage had settled 3 inches at the lowest point. By installing resistance piers, Thrasher corrected the foundation settlement. The homeowner...

Recent job requests in Sioux City, IA

Neighborhood: Williams Ave, Sioux City, 51106

Have a 6 x 6 concrete patio slab that is making its way to china. Need someone to raise it. Additional information: I need help with: Concrete Repair

Neighborhood: Sioux City, 51104

Additional information: I need help with: Concrete Repair

Neighborhood: Sioux City, 51106

Additional information: I need help with: Concrete Repair

Neighborhood: Navaho Cir, Sioux City, 51104

I have a retaining wall along my driveway that is leaning in.

Neighborhood: Blackstone Ave, Sioux City, 51104

My sidewalk is raising do to erosion issue.

Neighborhood: Old Lakeport Rd, Sioux City, 51106

I've done a 4-day charcoal test our home (in a the main living area of the basement) and our results came back with a reading of 4.2 pCL. Then I did a follow-up test back in my sons' basement bedroom and got a reading of 5.2. I know that the recommendation is to mitigate for all readings over 4.0, but our living arrangements are fairly short-term (about two years total) and I'd like to know the severity of being exposed to 5.2 for 2 years, pricing to mitigate, and the extent of the mitigation process. Thank you!

Neighborhood: Sioux City, 51104

Water coming in basement

Neighborhood: S Helen, Sioux City, 51106

Leaking basement wall.

Neighborhood: Ridge Ave, Sioux City, 51106

I have water coming in my basement, not from a sewer line.

Neighborhood: Stoneridge Court, Sioux City, 51106

I am looking for a radon test to be completed. I have used a test kit from department of health and the results suggested we seek a longer term test. Results were: * Radon Test Result = 3.3 pCi/L * Test Started 02/12/18 at 9:00 pm * Test Ended 02/16/18 at 7:00 am * Location Basement hall

Neighborhood: Myrtle, Sioux City, 51103

Wet basement

Neighborhood: Sioux City, 51104

Looking for free estimate. Water seeping through either wall or window in basement

Neighborhood: W. Highland Ave, Sioux City, 51103

Just bought new home never had a crawl space before. Just wanted it evaluated and identity problems

Neighborhood: Pawnee Pl, Sioux City, 51104

Crack on inside of concrete block foundation wall. In the process of purchasing this house. Need to inspect before purchase.

Neighborhood: Polk St, Sioux City, 51108

Neighborhood: Idlewood St, Sioux City, 51104

We are looking to put in an egress window in our basement. And was wondering how much it would be.

Neighborhood: Douglas Street, Sioux City, 51105

I need multiple above ground egress windows to replace double hung windows in bedrooms.

Neighborhood: Sioux City, 51104

Need to replace 2 existing window wells.

Neighborhood: Springbrook Drive, Sioux City, 51024

I have about 3 sections of sidewalk in front of my house that I would like quoted for mudjacking / lifting.

Neighborhood: Sioux City, 51104

Moisture in basement and dry wall has mold

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