Adding radon-resistant features during construction costs far less than mitigation later. Here is how builders do it.
In this article
Why it matters
Radon is a radioactive gas from soil that can build up indoors.
Gas-permeable layer
A layer of aggregate under the slab lets gas move to the vent.
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Sealing
Seal slab cracks, joints and penetrations.
Vent pipe
A pipe from under the slab through the roof creates a passive system.
Future fan
Leave an electrical outlet in the attic so a fan can be added if needed.
Testing after occupancy
Recommend a radon test once the home is occupied.
Local requirements
Check whether your area requires these features by code.
Getting started
Add radon-resistant details to your standard plans in higher radon zones.
Common mistakes
No sealing, vent pipe without a clear path and no outlet for a future fan.
Example
A home builder in a higher radon county made radon-resistant features standard. Buyers appreciated it, and the builder avoided mitigation callbacks after closing.
Plan details to standardize
Aggregate layer under the slab, sealed joints and penetrations, labeled vent pipe and attic outlet. Standard details prevent field improvising.
What to track
Homes built with the system and post-occupancy test results shared by buyers.
Talking with buyers
Explain the system at the walkthrough and recommend a test after move-in. Buyers value knowing it is already built in.
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Frequently asked questions
Do new homes need radon-resistant construction?
It depends on the location. Some jurisdictions require radon-resistant features in new construction, especially in higher radon zones. Even where not required, it is an inexpensive addition.