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Radon Design Blog

Guides on radon-control design for multifamily, HUD, school, and commercial construction, keyed to the ANSI/AARST standards that reviewers and lenders check for.

• Published July 28, 2026

  Radon Mitigation Design for New Schools

  How to design a radon mitigation system for a new school to ANSI/AARST CC-1000-2018: which standard applies, what the package includes, and how footprint drives system count.

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• Published July 24, 2026

  Radon Control System Design for Commercial Buildings

  A commercial radon control system design is a stamped plan that keeps soil gas out of a new building, fixing the sub-slab layout, barrier, and vent stack before the pour.

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• Published July 21, 2026

  Radon Vent Stack Sizing for Multifamily Buildings

  How radon vent stack sizing works for multifamily buildings: the 2-inch, 3-inch, and 4-inch airflow bands, and what pressure field extension analysis decides.

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• Published July 17, 2026

  Passive vs. Active Radon Control in New Construction

  Passive radon control vents soil gas on stack effect; active control adds a fan. New construction starts passive and converts only if a post-construction test exceeds the action level.

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• Published July 14, 2026

  What Is Included in a Radon Mitigation Design Package for Large Buildings

  A radon mitigation design package for a large building includes collection layout drawings, barrier and sealing specifications, vent stack routing, fan provisions, and a certified professional's standard-referenced review.

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• Published July 10, 2026

  Radon System Design for New Apartment Buildings

  How to design a radon system for a new apartment building to ANSI/AARST CC-1000-2018: what the package covers, passive vs. active control, vent stack routing, and HUD requirements.

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• Published July 7, 2026

  SGM-MFLB-2023 Radon Mitigation in Existing Large Buildings

  ANSI/AARST SGM-MFLB-2023 is the standard for mitigating radon in existing multifamily, school, commercial, and mixed-use buildings, and what a compliant design package must contain.

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• Published July 3, 2026

  HUD Radon Requirements for Multifamily Housing

  HUD-financed multifamily housing must address radon two ways: ANSI/AARST testing with a 4.0 pCi/L action level for existing buildings, and CC-1000-2018 design for new construction.

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• Published June 30, 2026

  ANSI/AARST CC-1000 Radon Design Requirements for New Construction

  ANSI/AARST CC-1000-2018 sets the radon design requirements for new multifamily, school, and commercial construction: a continuous gas barrier, sub-slab collection, suction points, and code-placed vent stacks.

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• Published June 29, 2026

  Radon Mitigation Design for Multifamily Buildings

  How to design a radon mitigation system for a multifamily building to ANSI/AARST CC-1000-2018: what the package includes, passive vs. active control, and HUD requirements.

  Read the guide