Coordinate before close-in
Discuss the gas-permeable layer, soil-gas collection, penetrations, vent route, future fan location, electrical provision, roof discharge, labeling, and how additions or multiple foundations affect the plan.
Passive is not a measured result
A passive pipe relies on natural movement; an active system adds an in-line fan. Neither label substitutes for a radon test under appropriate conditions after construction.
Activation and modification
Current Iowa rules effective July 1, 2026 state that conversion of a passive system to active, and modifications to an existing active system, must be performed by credentialed persons.
Primary sources
Claims checked August 2, 2026. Guidance can change; confirm the current source before acting.