For what it's worth.
The type of doors that I have down in Houston are the aluminum clopay multi sectional that have the individual sections with the hinges and rollers with the springs over head.
I have three separate doors.
I ended up cutting 1/2" blue foam board bought at the local Lowes and cut it to fit the individual sections. You end up flexing it to snap in place and it holds well and works great for the price.
It makes a major difference when heating and cooling my 5 car garage.
