It is just "store bought" corrugated sheet metal from Lowes!

I love the idea. Were you lucky enough to have the sheet size match your needs or did you or Lowe's cut them to size? I think this would be an awesome treatment in many areas, like my basement. If you got tired of the look, just spray paint it!

I had a tradesman install it so I'm not sure. But with this material you can overlay seaming. The seams run horizontal in this bath.

It is an inexpensive, practical and fun treatment which can be used in many areas.

do you know or think the bathroom humidity would ruin the wall behind this? I love the look and was curious. thank you for all of your info also.

This is a Powder Room so there is no moisture in the room. There is plenty of air between the corrugated and the wall so I doubt this would be a problem even in a humid environment.