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At Don Johnson Construction LLC, we bring high-performance craftsmanship to your job site—every time. Based in Sioux Falls, South Dakota, we specialize in Gypsum Floor Underlayment and Pre-Cast Panel Grouting with precision that stands the test of time. As a certified USG Levelrock Brand Applicator, we deliver code-compliant, long-lasting solutions for residential, commercial, and multi-family projects.
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We’re not just another crew with tools. We're a USG Levelrock Brand Approved Applicator, bringing product expertise and process know-how that meet and exceed industry standards. Every pour, every grout—done right the first time.
We use non-metallic, non-shrink grout and gypsum underlayment systems that perform in high-stress environments—from radiant heat flooring to load-bearing tilt-up panels. Our process is streamlined, clean, and built for efficiency.
Serving Sioux Falls and beyond, we combine small-town values with large-scale construction experience. Our clients appreciate the honest communication, firm timelines, and commitment to quality they get on every project.
When you're managing a construction project, you don't have time for do-overs. At Don Johnson Construction LLC, we deliver top-tier Gypsum Floor Underlayment and Pre-Cast Panel Grouting services so your project starts with a rock-solid foundation.
Our team understands the pressure of keeping schedules, managing budgets, and coordinating trades. That’s why we show up prepared, pour with precision, and grout with consistency—every time.
Whether it’s multi-family units, commercial spaces, or custom builds, we’re ready to deliver performance-driven results backed by years of experience and manufacturer-backed certification.
A: Gypsum underlayment is used to create a smooth, level surface over subfloors before installing floor finishes. It's commonly applied in multi-family housing, radiant heating systems, and commercial builds.
A: Yes. Gypsum underlayments are naturally fire-resistant and are often used to improve a building’s fire rating, especially in multi-unit structures.
A: Cementitious underlayments are typically used for exterior or high-moisture environments, while gypsum-based underlayments are more common indoors and are easier to apply over wood or concrete subfloors.
A: Dry times vary based on thickness, humidity, and temperature. Typically, light foot traffic is allowed after 2–4 hours, and full cure may take 5–7 days.
A: Certified applicators ensure the material is mixed, applied, and cured according to manufacturer specs, reducing the risk of cracking, moisture issues, or failure.
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