How long must radon measurement professionals wait after installation of a mitigation system before re-testing a home?

Radon measurement professionals must wait 24 hours after the installation of a mitigation system before re-testing a home to ensure accurate measurement of radon levels. This waiting period allows the mitigation system to stabilize and operate effectively, ensuring that radon concentrations can be accurately assessed. Testing too soon may yield misleading results because the system may not have had enough time to adequately reduce the radon levels throughout the home.

A 24-hour wait ensures that the air exchange has reached a steady state, providing a clearer picture of whether the mitigation system is performing as intended. If testing occurs immediately after installation, the results may not reflect the system's long-term efficacy, potentially leading to unnecessary concerns or unneeded further mitigation efforts. Therefore, adhering to the 24-hour waiting period is crucial for obtaining reliable radon measurement post-mitigation.