Radon Mitigation Accessories: What You Actually Need vs What You Can Skip

The Core System: Fan + Pipe

Everything else is in service of these two components. A radon mitigation system is:

1. A suction point (core-drilled hole through the slab)
2. PVC pipe running from suction point to fan to exterior exhaust
3. A continuously running fan

The accessories exist to make this system install correctly, comply with code, and function reliably.

Required by Code

System failure warning device / manometer: AARST-ANSI MALB 2022 (the governing standard for mitigator installation) requires a visual indicator of system operation, permanently labeled, installed in a visible location on the system piping. Most states have adopted this standard. The U-tube manometer ($28) fills this requirement. Don't skip it — it's how you know your system is running every day without testing.

Pipe sealant at all penetrations: Every location where the pipe passes through a building element (floor, wall, ceiling, rim joist) must be sealed airtight. Radon can bypass the system entirely if there are air leaks at penetrations.

Required for the Installation

Core drill bit (3" diamond): You can't install a slab system without drilling through the slab. The 3" diamond core bit is the correct size for standard radon pipe. Rental is an option; buying makes sense if you might need it again.

Hydraulic cement: The annular space between the PVC pipe and the core hole must be sealed. Hydraulic cement ($16) is the right material — it sets fast, bonds to both concrete and PVC, and doesn't crack or shrink. This seal is structural to the system's performance.

PVC primer and cement: For joining PVC fittings and pipe sections. Use the correct schedule 40 primer/cement; hardware store gray or clear cement is fine. Follow the set time on the can before applying system suction.

Pipe hanger straps: Every 4–6 feet on horizontal pipe runs, every 6–8 feet on vertical runs. Code-compliant and practically required for a professional-looking install that doesn't sag over time. 3" pipe hangers are $14 for a 25-pack.

Situationally Required

Sump pit cover: Required if your home has an open sump pit. An open sump is an uncontrolled radon entry point that undermines any sub-slab system. The cover ($65) seals the pit while maintaining pump function and can integrate with the radon pipe.

Vapor barrier and accessories (tape, stakes): Required for crawl space installations. The liner is the system's primary radon barrier in a crawl space — without it, there's nothing to depressurize against.

Additional suction points: If the sub-slab communication test shows limited pressure field extension from a single point, additional suction holes may be required. Each additional suction point requires additional PVC fittings and a tee connection into the main pipe.

Genuinely Optional

Radon pipe paint or labels: Nice-to-have for professional appearance. Required only in specific jurisdictions that mandate labeled pipe from point of entry to exhaust.

Fan speed controller: Inline fan speed controllers (like a light dimmer, but rated for motors) can reduce fan noise in interior installations. Useful if the fan is audible from living spaces; not necessary for exterior or attic mounting.

Inline PVC union: Allows fan removal for maintenance without cutting pipe. Useful for attic installations where you might want to swap the fan without disturbing the full pipe run. Not required.

Decorative pipe cover/chase: In finished basements where the pipe is visible, some homeowners build a decorative box around the pipe. Purely aesthetic.

The Shopping List for a Standard Slab Install

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