Radon-control design for multifamily buildings
New multifamily buildings carry the same soil-gas risk as single-family homes, but at a scale where a generic prescriptive detail no longer fits. Garden apartments, podium construction, and mid-rise residential all sit on slabs or below-grade levels that contact soil, and radon entry routes multiply with every shared corridor, elevator pit, and utility chase.
ANSI/AARST CC-1000-2018 is the consensus standard for radon-resistant design in new construction of multifamily and other large buildings. It calls for an engineered approach: gas-permeable material below the slab, a continuous soil-gas-retarder membrane, sealed penetrations, and a vent pipe network sized for the building rather than a single dwelling.
We read your architectural set, lay out the sub-slab collection and vent routing, size the riser network, and produce a code-referenced design package. A certified radon professional reviews and signs off on every package before it ships, so the credential that the compliance chain expects is already in place.
What the design package covers
- Sub-slab gas-permeable layer and soil-gas-retarder membrane specification
- Vent pipe routing and riser network sized for the building footprint
- Sealing details for slab penetrations, expansion joints, and below-grade walls
- Provisions for future active fan installation if post-occupancy testing warrants it
- Code-reference summary keyed to ANSI/AARST CC-1000-2018
Governing standard
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.