National Home Inspector Practice Exam 2025 - Free Home Inspector Practice Questions and Study Guide

Radon is typically tested in homes using a radon test kit placed in the lowest living area of the building, such as a basement or the ground floor. This method is essential because radon, a naturally occurring radioactive gas, tends to accumulate in lower levels of a house due to its weight and the fact that it seeps through cracks and openings in the foundation.

The placement of the test kit in the lowest living area is critical for capturing accurate readings since this is where the highest concentrations of radon are generally found. These kits function by trapping airborne radon, which can then be sent to a lab for analysis, providing a measure of the radon levels present in the home.

While air samples sent to a lab can also be part of the radon testing process, the most common and straightforward method involves the use of a kit specifically designed for home testing, enhancing accessibility and ease of use for homeowners. The other options, such as measuring water levels or using detection devices near windows, are not conventional methods for radon testing in homes and do not target the areas where radon typically poses the greatest risk.