Originally Posted by Shuttled84
Hi to everyone and thanks in advance for all your help.
My wife and I purchased a 2006 E450 Shuttle today and we're excited/a little nervous about the conversion.
I've watched youtube videos of people installing insulation on the ceiling, then drilling the wood ceiling over the insulation.
So what are they drilling into? the fiberglass?
On metal body buses, they drill into the metal stiffeners that hold the roof skin in place and shape.
On a fiberglass body you will also have some internal reinforcement 'ribs' that are probably foam filled. I would attach wooden furring strips with a strong adhesive like Sikaflex and some short sheet metal screws to the fiberglass ribs and then attach the ceiling paneling to the furring strips. The insulation would be under and between the furring strips.