What is the minimum distance that should be measured from an exterior wall during a radon test?

The minimum distance measured from an exterior wall during a radon test should be 12 inches. This distance is critical because it helps ensure that the radon measurement is not influenced by the wall or any potential external environmental factors that could affect radon levels. If the testing device is placed too close to an exterior wall, it could capture air that might be influenced by outside conditions, leading to unreliable results.

By positioning the radon measurement device at least 12 inches away, testers can obtain a more accurate representation of indoor air quality. This standard distance is established in guidance documents from various health organizations to ensure that radon levels assessed reflect the conditions in the central living area of the home.

This practice helps enhance the accuracy of radon testing, which is crucial for determining appropriate mitigation strategies. Accurate measurements are vital for protecting health and making informed decisions on radon mitigation.