Strong From the Ground Up: Why Two Structures Homes Uses Post-Tension Foundations
When building a new home in Oklahoma, some of the most important decisions happen long before the countertops, flooring, or paint colors are selected. One of the most important is the foundation beneath the home.
Oklahoma's expansive clay soils can swell as they absorb moisture and shrink as they dry. Those changes can create movement beneath a foundation and place significant stress on the structure above it. That's why foundation design matters so much when building a home in Oklahoma.
At Two Structures Homes, we use engineered post-tension foundations as part of our commitment to building homes designed for Oklahoma conditions.
Why Oklahoma Soil Makes Foundation Design So Important
Oklahoma is known for expansive clay soils. These soils can change volume significantly as moisture levels change throughout the year. During wet periods, clay soils can absorb water and expand. During hot or dry conditions, those same soils can lose moisture and contract.
Over time, repeated cycles of expansion and contraction can create movement beneath a home's foundation. How a homesite is prepared, how the foundation is engineered, and how water is managed around the home can all play an important role in long-term structural performance.
This isn't simply a theoretical concern. 2-10 Home Buyers Warranty analyzed lessons learned from more than 10,000 structural claims and reported that the great majority of structural claims resulted from foundation movement. Their analysis identified active soils—including expansive soils—and fill material as the two primary causes of structural claims.
For Oklahoma homeowners, that reinforces something we have long believed: what happens below your home matters just as much as what you can see above it.
What Is a Post-Tension Foundation?
A post-tension foundation is a concrete slab reinforced with high-strength steel tendons that run through the foundation. After the concrete reaches the appropriate strength, those tendons are tensioned according to the engineered foundation design.
The tensioned steel places the concrete under compression, helping the slab function as a more unified structural system and better resist stresses caused by changing soil conditions.
Rather than simply choosing a foundation based on what is easiest or least expensive to build, the goal is to provide a foundation system engineered for the conditions beneath the home.
Why Two Structures Homes Uses Post-Tension Foundations
We build homes throughout the Oklahoma City metro and surrounding communities, where soil conditions can vary considerably from one homesite to another. Our decision to use post-tension foundations is based on long-term performance—not simply meeting minimum requirements.
Some of the reasons we use post-tension foundations include:
- Greater resistance to soil-related stresses: Post-tensioning helps the foundation act as a unified system when forces beneath the slab change.
- Engineered performance: The foundation system is designed around structural requirements rather than relying solely on conventional reinforcement.
- Crack control: Keeping concrete under compression can help control cracking and improve the performance of the slab.
- Long-term durability: Foundation design is one of the areas where investing in construction quality can provide benefits long after the home is completed.
No foundation system can eliminate every possibility of movement or cracking. Soil conditions, drainage, moisture, site preparation, construction practices, and homeowner maintenance all affect long-term performance. A post-tension foundation is one part of a larger approach to building appropriately for Oklahoma conditions.
What 10,000 Structural Claims Can Teach Homeowners
One of the most interesting findings from 2-10 Home Buyers Warranty's review of more than 10,000 structural claims is that structural problems don't necessarily appear immediately after a home is built.
According to 2-10, only about 30% of structural claims occur during the first four years after construction. Approximately 70% occur after year four, with structural claim activity peaking during years four through seven.
2-10 also reported that the average structural claim costs approximately $70,000 to investigate and repair.
Those numbers highlight an important point for anyone shopping for a new home: construction quality isn't only about how a home looks on closing day. Some of the most important components of a home are hidden behind walls, beneath insulation, inside mechanical systems, and under the foundation itself.
Foundation Design Is Only Part of the Equation
A well-engineered foundation is important, but it doesn't operate independently from the homesite around it.
Water management is particularly important with expansive soils. In its follow-up analysis of structural claims, 2-10 emphasized the importance of geotechnical investigation, properly engineered fill, grading, drainage, and controlling water around foundations.
When excessive water accumulates near a foundation—or moisture levels change dramatically from one area of the foundation to another—the soil beneath the home can respond differently.
That's why proper site preparation, grading, drainage, and ongoing moisture management around the home remain important even when the home has an engineered foundation.
Why a 10-Year Structural Warranty Matters
The timing of structural claims also helps explain why long-term structural warranty protection matters.
If approximately 70% of structural claims identified in 2-10's analysis occurred after the first four years, a typical one-year builder warranty would have expired long before many structural problems became apparent.
That's one reason Two Structures Homes provides homeowners with a 2-10 Home Buyers Warranty, including long-term structural warranty protection.
A warranty doesn't replace good construction. We believe the two should work together: build the home properly from the beginning and provide meaningful protection for the homeowner afterward.
Built Better Starts Below the Surface
At Two Structures Homes, our Built Better philosophy isn't about one product or one construction feature. It's about making thoughtful decisions throughout the home—even in places homeowners may never see once construction is complete.
That starts with the foundation and continues throughout the structure and building envelope, including features such as 2×6 exterior walls, advanced insulation, properly sealed ductwork, high-efficiency HVAC equipment, low-E windows, water-management details, and other energy-efficient construction practices.
Many of these features aren't as exciting to select as countertops or flooring, but they can have a much greater impact on how a home performs for years to come.
You can see more of the construction features included in our homes on our Two Structures Homes Standard Features page.
Questions to Ask Your Builder About the Foundation
If you're comparing home builders in Oklahoma, don't be afraid to ask questions about the parts of the home you can't see. Some good questions include:
- What type of foundation do you typically use?
- How is the foundation engineered for the homesite?
- How do you address Oklahoma's expansive soils?
- How are fill and site preparation handled?
- How is water directed away from the foundation?
- What structural warranty is included with the home?
- How long does the structural coverage last?
A builder should be able to explain not only what they build, but why they build it that way.
Building a New Home in Oklahoma?
Whether you're building in one of our communities or building a custom home on your own land, our goal is to build a home designed for long-term performance from the ground up.
If you're considering building a new home in the Oklahoma City metro, we'd be happy to talk with you about your homesite, your plans, and how Two Structures Homes approaches the construction process.
Call or text Two Structures Homes at (405) 509-9435 or schedule a consultation with our team.
Because a home isn't truly Built Better unless it's built better from the ground up.