My GC used black cast iron gas pipe to connect from the PGE riser to the interior of the house. He wrapped the pipe from the riser, down into the ground, and up 10" above the ground where the pipe comes back above grade in the crawl space. Then in the crawlspace there is another 15LFT or so of exposed black gas pipe which is not wrapped. Is this ok? Do I need to be concerned about corrosion?
The crawl space is not conditioned, has many open vents, and has no vapor barrier (just dirt on the bottom).
Thanks in advance for your help!