Internal wall identification

[cabinscooter]

Hi, I'm trying to identify the construction of an internal wall in order to be confident about hanging heavy items on it (e.g a TV) and also to decide the fixing method. I had assumed it was a stud wall until I looked at the wall from above in the loft (it's an upstairs wall). See attached photos. I've used electrical cable and metal detector devices with no firm conclusion. In fact I get readings all over the wall which I'm sure are false The wall is only 60mm deep incuding plaster. Could it be some sort of insulation ? there are several walls that look the same from above. Any ideas and suggested fixing method would be welcome.
Alan

 

[frutbunn]

Paramount board. As far as I know no one makes it anymore. Its 2 layers of plasterboard with the "space" in between made of "egg carton" cardboard bonded to both boards.

 

[^woody^]

If you use suitable board fixings for the load, it will be ok. Toggle, umbrella, Grip-it etc

 

[Grantx]

Use fixing anchors for plaster boards. Enter that into B&Q, for example, and they'll come up. And they are cheap by the bag full.