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The groundwork for your safety & peace of mind.


As Franklin County’s premier foundation builder, Unerstall Foundations & Flatwork Inc has the expertise, equipment, and capabilities to handle all of your concrete construction needs.

Based in Union, MO, we provide a diverse range of affordable foundation installation services for residential and commercial clients throughout the Greater St. Louis metro area. We also provide flatwork services, foundation repairs, and install insulated concrete foundations.

Start building a strong & reliable foundation. Call us to schedule a free estimate!
Foundation work by Unerstall Foundations & Flatwork Inc,

Foundation Installation

Constructing a strong concrete foundation is essential to safeguarding the integrity and safety of your new project. We’ll work closely with you to develop results-driven solutions for all your concrete and foundation construction needs. We utilize a state-of-the-art robotic total station for optimal accuracy.

Looking for a more energy efficient foundation/home? Insulated concrete forms can help!

We pour concrete foundations for the following types of projects

  • New homes
  • Room additions
  • Modular homes
  • Garages
  • Commercial projects
  • Retaining walls

What other foundation services do we offer?

  • Excavation
  • Egress window installation
  • New window & well installation
  • Drain pipe installation

What can you expect during a foundation installation project?

Our team will meet with the customer to go over their needs, shoot the grades and elevations, and address issues with drainage and accessibility. We will then lay out the footprint for the structure so excavation can begin.

Once the area is excavated, we will begin pouring you a new concrete foundation and install the drain tile and damp proofing.

Drain Tile & Damp Proofing Installation

Damp proofing and waterproofing your new foundation is essential to its longevity, integrity, and safety; however, they are not the same techniques.

Whether you opt for interior/exterior drain tile waterproofing or damp proofing (or both), our foundation builders will custom-design a system that protects your foundation for the long-term.

What’s the difference between damp proofing vs. drain tiling?

Damp proofing is a coated treatment applied to foundations, basements, or crawl spaces. Once sprayed, the asphalt coating functions as a moisture barrier and prevents water and humid air from passing through the foundation.

Damp proofing does not seal cracks or holes in the foundation, nor does it serve as a waterproofing or drainage system.

Drain tiles function as a drainage system. These porous pipes can run along with the interior or exterior of a foundation and redirect water away. They are especially beneficial in areas that are prone to heavy rain and snow. We can also provide sump pump installation in conjunction with a drain tile system.

If you’d like to explore your options for waterproofing vs. damp proofing, contact us today!

Need to rent concrete forms or concrete equipment? Call us!

Unerstall Foundations & Flatwork Inc


1673 Old Hwy 50 W
Union, MO 63084


Monday ‒ Friday
7:00 AM ‒ 5:00 PM