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In colder climates – R-19 sheet insulation in the crawlspace is a fantastic way to keep that space warm. This insulation is installed after the dirt floor vapor barrier is installed and attached to the foundation wall, as in the images within this section. The image below details both vapor barrier and sheet insulation.

Radon system – When a radon system is required, I recommend an active system. 
Most radon systems today have a radon mat under the vapor barrier that is then vented through the wall system and out of the roof. 2021 code also says the radon system can be a passive system which simply means there is no fan moving the air, but rather the radon follows the path of least resistance. I recommend a fan-driven active system as the fan constantly draws air from unde...