Curious if this is PT wood, I am not familiar with this color of framing.
Located in a 1994 home crawlspace
Appears like wood preservative was applied over wood framing.
The insulation looks upside down though.
Possibility they used this; https://www.wolmanizedwood.com/home/products/non-pressure-preservative-products/frameguard/
A. Contract Documents are based on FrameGuard wood treatment by Arch Wood Protection, Inc.
Yes sir it is.
Interesting product, Thank you for providing the link. I tried all kinds search methods and could not find anything on line.