Radon & New Construction

Radon Mitigation Systems in New Construction

Builders typically install one of three types of radon mitigation systems in new construction homes:

  • Passive sub-slab or sub-membrane depressurization system
  • Passive or skeletal new construction systems
  • Passive system “rough-in”

Passive Sub-Slab or Sub-Membrane Depressurization System

We recommend this option above all others. We encourage builders to install a complete passive sub-slab or sub-membrane depressurization system which would be fully functioning as soon as construction is finished. New construction installation is much simpler and cost-effective than a remodeling installation. The home should be tested after occupancy and the passive system should be converted to an active system if the test reveals elevated radon levels.

Passive or Skeletal New Construction Systems

Passive or skeletal new construction systems are not acknowledged mitigation systems and may or may not reduce radon concentrations in homes. If a test reveals elevated levels of radon, passive and skeletal new construction systems should be converted to active soil depressurization systems by a licensed mitigation professional.

Passive System “Rough-In”

This technique involves only the sub-slab preparation and installation of a stubbed vent pipe above the slab. A vent pipe can be connected and routed through the home and roof later. We do not recommend this option. Installation is easier, less intrusive and more cost-effective during construction than after construction when the walls are closed up. Builders who “rough in” a radon reduction system, must:

  • Disclose to the home buyer that the home is not equipped with a functioning system.
  • Seal off the riser stub to prevent discharge of radon into the living space.
  • Label the stub so it is not used as a plumbing waste line.

Radon Mitigation System Architectural Diagrams


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