Guidance: Don't ask to inherit "learn on the job" or slipshod mistakes.
At a bare minimum, installers need training in radon technology.
Verification of radon training and can be found at your state radon program, NEHA National Radon Proficiency Program or the National Radon Safety Board.
 
However:
Radon certification training does not expand to bridge across a wide set of construction disciplines needed:

Lessons a professional contractor learns over many years will benefit you.
Radon experience is also critical. Challenges can quickly go beyond basic training manuals to require a deeper understanding of radon reductions principles.
Systems must also comply with codes and national standards that can be very complicated for a novice to interpret.
Applicable standards: EPA-RMS (1994), AARST ASD-RMS (2006) and/or ASTM E2121 (2001-2008).
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