Interior wall material, not interior paneling
I'm not talking about the interior paneling, we are in the middle of tearing that out and installing new. I should have made myself clearer, sorry, but this is a little confusing.
In the inside of the walls (after you tear out the old paneling) the factory put sheets of paneling between the exterior sheet aluminum and the aluminum framing. It is almost like they were using it for sound deadening or insulation. It appears to have been put up next to the framing (c-channels and such) and then the exterior aluminum sheeting was held into place and welded. This made a framing/paneling/exterior sheeting sandwich. It will be difficult to get out. I hope that helps explain the configuration.
I am planning on insulating with Dow closed cell insulation board inside the wall. I just wondered what the rest of you did if/when you ran into this. I don't think it would hurt it to stay there, but I was hoping to get some thoughts or actual experience.
I didn't mean to go on so long, thanks for looking at this.