Quote Originally Posted by fitz19d View Post
New fun. Anyone know about the trustability of Radon sensors and need for calibration?

My house that was a wash due to meth had 2.7 on the radon. It's like 5 houses west of the current one. It was an unfinished basement. New house same model but finished with the crawlspace door in a basement bedroom. Believe meter was left in this bedroom with basement door shut for the few days it was there largely.

It came back as 4.8 with 4.0 being EPA cutoff for remediation required? Possible bad/off sensor? Caused by just less airflow the way the basement is? (Inspector got 0 co results with 10-20 in the flue which was fine but was unhappy with the seemingly smaller/missing or hidden behind furnace combustion air vent or whatever.)
I had put in the contract that the owner would have a professionally installed mitigation system in at their expense. MY DIY kits came back at over 12. The owners had the system put in ... easy peasy.