ANSI/AARST CC-1000-2018 for radon-control design
ANSI/AARST CC-1000-2018, titled Radon Mitigation Standards for New Construction of Multifamily, School, Commercial and Mixed-Use Buildings, is the consensus standard developed by AARST and accredited by ANSI. It sets the design basis for keeping soil gas out of new large buildings.
Where single-family radon-resistant construction is usually handled prescriptively, CC-1000 treats a large building as an engineered system. It addresses the gas-permeable layer below the slab, the soil-gas-retarder membrane, the sealing of penetrations and joints, and a vent pipe system designed to depressurize the sub-slab area across the whole footprint.
Because it is referenced by codes, lenders, and the HUD radon policy framework, CC-1000 has become the practical benchmark for new multifamily and commercial work. An engineered design package built to CC-1000 gives a plan reviewer the routing, specifications, and references they need to confirm compliance.
What the standard requires
- Applies to new construction of multifamily, school, commercial, and mixed-use buildings
- Requires a gas-permeable material layer beneath ground-contact slabs
- Requires a continuous soil-gas-retarder membrane with sealed penetrations and joints
- Specifies a vent pipe system engineered to depressurize the sub-slab area
- Provides for a passive system with the ability to add active fans if testing warrants
In the standard's own words
“The provisions in this standard provide prescriptive minimum requirements for the construction of any building intended for human occupancy, except for 1 and 2 family dwellings, in order to reduce occupant exposure to radon and other hazardous soil gases.”
ANSI/AARST CC-1000-2018, Scope — source
Building types under this standard
Multifamily
New apartment and condominium construction designed to CC-1000-2018, the consensus standard for radon-resistant new construction in large buildings.
Apartments
Purpose-built rental apartment projects, designed to the CC-1000-2018 new-construction standard for radon-resistant large buildings.
Commercial
Offices, retail, mixed-occupancy, and other commercial new construction with ground-contact slabs, designed to CC-1000-2018.
Schools
New K-12 and education facilities, where children spend long hours on ground-contact slabs, designed to CC-1000-2018.
Mixed-use
Buildings that stack residential over ground-floor retail or office, where a single radon strategy has to serve multiple occupancy types.
Further reading
ANSI/AARST CC-1000 Radon Design Requirements for New Construction
ANSI/AARST CC-1000-2018 sets radon design requirements for new multifamily, school, and commercial construction: gas barrier and sub-slab collection.
Passive vs. Active Radon Control in New Construction
Passive radon control vents soil gas on stack effect; active adds a fan. New construction starts passive, converting only if a test exceeds the limit.
What Is Included in a Radon Mitigation Design Package for Large Buildings
A large-building radon mitigation design package includes collection layout drawings, barrier and sealing specifications, vent routing, and fan provisions.
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