When is it recommended to conduct additional radon testing?

Conducting additional radon testing is particularly recommended when there are multiple foundation areas in a home. Homes with different types of foundations, such as basements, crawl spaces, or slab-on-grade foundations, can experience varying radon levels due to differences in ventilation, soil permeability, and other structural factors. Testing in each distinct area helps to ensure that potential radon exposure is accurately assessed throughout the entire property. This comprehensive testing approach is vital for identifying specific locations that may require mitigation efforts, as radon levels can differ between these foundation types.

Other factors mentioned, like new construction or seasonal testing periods, are relevant, but they do not inherently necessitate additional testing in the same way that diverse foundation areas do. New constructions might require initial testing, while seasonal variations could impact radon levels but are not definitive reasons for further testing across all situations. Hence, focusing on multiple foundation types addresses the complexity and variability of radon measurements in a more targeted manner.