Wayne Parham Messages: 18764 Registered: January 2001
Illuminati (33rd Degree)
I personally like R13 (fiberglass) insulation. I hate putting it in, as I'm always scratchy for the rest of the day. But it does exactly what I want it to do. I buy it in rolls, cut it to size, remove the vapor barrier and glue it in with white glue. I used to staple it in, but after many years I've stopped that because staples can sometimes vibrate loose and come out.
You should line the front, side and top and also span the cross section by laying a sheet on each set of braces, spanning the cross-section. Your braces can be a simple cross-brace, a window brace or a combination of both techniques.