Step 31: Insulate the roof
After the headliner is installed, you can start to glue in your insulation. I used about a 2 inch of rigid foam.
On the curves I used a base of 3/4 inch foam, kerfed with a utility knife so it would fold. I used Titebond II to glue it down. I then used 1/4 sheets (usually three) to fill in the rest of the space. Also glued with TB II.
I used a variety of nails and strips of material to hold it all into place.