Indoor corrugated metal, cool huh? The top part above the trussed did not turn out well because it was left over pieces, too short. Is okay for now.
I think it is a good insulator but i need to tighten up the edges, maybe tape or glue or more screws.
I am thinking to paint the trusses the same off white color to keep it simple. It's a good place for a desk up there, nice and warm in the winter.