When preparing for a radon measurement it is very important to maintain closed building conditions for a period of twelve (12) hours prior and during the test. Whether the house is open or closed for short or extended periods of time prior to the 12 hour requirement has little or no impact on the measurement. Closed building conditions are considered as follows.
The requirements listed above are designed to protect both the seller and the buyer as some of the requirements can lower the radon concentration and others can raise it.
Most of the more expensive continuous radon monitors, such as the Accustar RS800, have sensors built in to detect changes in room temperature, relative humidity, barometric pressure, movement and tampering.
Hopefully the information provided here will help you understand what the requirements are for a radon measurement.
If you should have any questions or concerns please feel free to contact us at (618) 641-9106.