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.

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.

Pool Deck Leveled in Sioux City, IA

Pool Deck Leveled in Sioux City, IA

Before After
Pool Deck Leveled in Sioux City, IA Pool Deck Leveled in Sioux City, IA

Adam is a homeowner in Sioux City, IA, and he had a growing concern about the amount of water collecting around his pool. He wanted to make sure the concrete around his pool would last and didn’t want the slabs to become even more uneven. 

We sent Service Technician Chad Bauder out to Adam’s home. He recommended using PolyLevel and NexusPro Joint Sealant to fix the settling concrete. The crew added more PolyLevel to areas where there was a lot of water collection. Adam was thrilled to know that his pool deck would no longer be uneven! 

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.  

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: Sioux City, 51104

Additional information: I need help with: Foundation Settlement

Neighborhood: Fawcett St, Sioux City, 51103

Rental house. Water must be getting in on north side. I noticed some dry dirt in a few areas. Additional information: I need help with: Waterproofing

Neighborhood: Sioux City, 51103

Raise a section of sidewalk next to the driveway 6x4 solid concrete that dropped 1 inch next to the driveway . If it can be raised compared to replacement of the slab in cost. I would appreciate your reply. Additional information: I need help with: General

Neighborhood: S Glass St, Sioux City, 51106

The bottom step has sunk approximately 2" from the step going into my house. Can you raise the step?

Neighborhood: Buchanan Ave., Sioux City, 51106

Hot tub slab needs 1 side raised Additional information: I need help with: Concrete Repair

Neighborhood: Cheyenne Blvd, Sioux City, 51104

Sump pump consideration for home. Additional information: I need help with: Waterproofing

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.
Job Stories From Sioux City, IA
Pool Deck Concrete Leveled in Sioux City, IA

A homeowner in Sioux City, IA was having trouble with uneven concrete around the pool. The concrete had significant settlements and created a major tripping hazard. The crew used a combination of PolyLevel and NexusPro Joint Sealant to level the concrete and close the exposed joints, creating a smooth and even surface, eliminating any tripping hazards. 

Wall Crack in Sioux City, IA Fixed with PowerBraces

New homeowners in Sioux City, IA just moved into their home and were concerned about a wall crack. Upon inspection of the home before the sale, they were told to keep an eye on it. Worried that the crack would get worse they decided to give Thrasher a call.

Our crew went out and upon inspection found one of the walls was in stage 2 of wall failure. We installed PowerBraces on the wall permanently stabilizing the wall and giving it the support, it needs.

Crawl Space Encapsulation in Sioux City, IA

These homeowners in Sioux City, IA noticed cold and hot air entering the inside of their home during each season. In the winter, cold air was seeping through the basement and floors above making it costly to heat the home. During the summer, hot and humid air was leaking into the basement making it an uncomfortable space to be in. All these negative effects are caused by a poorly insulated crawl space. The homeowners wanted to protect their home and knew over time it could lead to mold and rot. The customer called Thrasher and was impressed with our thorough inspection and detailed solution. They chose our solutions because they knew it was going to be the best permanent fix.

 System Design Specialist Corey Little and our team arrived at the Sioux City home and immediately began work on the crawl space encapsulation. Our team started by installing SilverGlo insulation to reflect and trap the heat in the crawl space. That was then paired with our CleanSpace waterproof liner to limit the amount of water vapor that can enter the space, and keep it dry to prevent mold and foul odors. These two products together provide a permanent solution for crawl space insulation.

 The customers were pleased with the efficiency, professionalism, and communication displayed by the team. In addition, they were impressed with the quality of work, and happy to have a peace of mind moving forward through the seasons.

Sioux City, IA Foundation Stabilized with Push Piers

Long-time homeowners were looking to sell their home but noticed that they were having trouble with the foundation. Cracks starting to appear in the drywall, floors and back patio. Looking for solution they decided to call Thrasher.


We were able to install Push Pier’s to stabilize the home. We attached the Push Piers to the footings of the home, stabilizing the foundation and prevent further settlement from occurring.

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