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
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.
Get a quote for your project
Send us your building plans and we return a fixed quote for an engineered, code-referenced radon-control design package, reviewed by a certified radon professional.