Gypsum on exterior wall

[HenkeNord]

I was going to get behind the outer panel of an extension to reroute a cable. Then I noticed that they installed gypsum instead of plastic film/paper before the outer panel. Is this okay, or does it have to be plastic film/paper, then nail battens, and finally the outer panel?

 

[atomlab]

Sure it's not fascia boards? They are made of gypsum. However, more durable than the ones you put up indoors.

 

[HenkeNord]

Thank you for the response. They could certainly be wind barrier boards. They look thinner than regular plasterboard. I didn't know there was something called wind barrier boards, but now I've read up on it. There actually seem to be advantages to it?