Radon testing and mitigation specialist. Selgrade Construction specializes in Radon testing and mitigation throughout Central Iowa. Our highly qualified, Iowa Certified radon specialists perform tests to determine radon gas levels and help customers make informed decisions on mitigation options. We can help with: • Radon testing • New construction • Existing homes • Mitigation • Soil vapor extraction sub-slab depressurization Selgrade Construction designs and installs high-quality radon mitigation systems, when needed, that are effective, efficient, unobtrusive and affordable. Call Selgrade Construction Inc. today, and arrange to have Radon levels in your home or business tested by certified professionals.