Structual Repair with metal components
This is more a theoretical question as I have not seen posts pertaining to using steel 2x4s to replace rotten wooden ones. My camper has some significant repairs and I thought about trying to incorpo...
Forum Discussion
Do not use PT wood in the camper. It can be highly corrosive due to the chemicals used. So the wood may hold up, but may cause issues with any metal parts around it, such as aluminum siding. See https://galvanizeit.org/hot-dip-galvanizing/how-long-does-hdg-last/contact-with-treated-wood for more info, or just google "pt wood corrosion".
It also used to contain arsenic, but this has been banned for about 15 years now, so any PT wood currently on the shelves should no longer contain any.
See https://en.wikipedia.org/wiki/Chromated_copper_arsenate for more info if you like. However... the chemicals now used for the purpose may or may not be safer, I do not know.
ETA: this document has some impressive images of steel vs. PT lumber:http://www.ggashi.com/wordpress/wp-content/uploads/PT-Lumber-Causes-Steel-Corrosion.pdf
It also used to contain arsenic, but this has been banned for about 15 years now, so any PT wood currently on the shelves should no longer contain any.
See https://en.wikipedia.org/wiki/Chromated_copper_arsenate for more info if you like. However... the chemicals now used for the purpose may or may not be safer, I do not know.
ETA: this document has some impressive images of steel vs. PT lumber:http://www.ggashi.com/wordpress/wp-content/uploads/PT-Lumber-Causes-Steel-Corrosion.pdf
