yup...."strips" of "Peel and Seal" as a sound deadener......on any "flat" panel
also at Lowes/HD....for insulation in the roof (and alot more sound deadening)....."aluminized" mylar bubble wrap in the insulation section...... 18"x25'=$20?
to glue it to the roof (or inside qtrs etc) just use some dabs of 3M weatherstrip adhesive or gasket chinch adhesive or contact cement
only one WARNING!: both are so easy to work with it's addictive!
you start thinking: "where else can I stick some"
footnote:ever notice on Over Hauled the whole bare interior on every car looks like aluminum foil......thats all aluminized bubble wrap