If you are in Douglasville, you have damm good eyesight if you can see North Carolina.
Are you talking about a true roll up door, ie, one manufactured by DBCI in Douglasville, or an actual sectional garage door?
Here is my DBCI 10x10 door.
MY THREAD about the problem with roll up doors
I have no idea how you would go about insulating a roll up door, it would add to the thickness of the door and preventing it from rolling up. They do make roll up doors that are made from interlocking slats (think Overhead Door Company) but they are industrial in nature and crazy expensive. Not sure if they make insulated slats or not.
Roll up doors cannot be made to fit tight, no matter what you do, how many seals you install, it just isn't going to happen. With a sectional door, with seals on the sides and top, you can seal them about air tight, but not a roll up.
If you are using an 8 ft opening, buy a 10 ft tall door, and cut about a foot off the tracks. Install the roll way up above the door header and this will leave the door passing an equidistance from the header at all times and positions, leaving you a small 1/4 to 1/2 inch gap to close with a rubber seal. If you install an 8 ft door in an 8 ft opening (I did a 10 ft in a 10 ft opening) you get into a situation where the gap at the top gets huge with the door rolled down, and very tiny with it rolled up (when you don't care what the gap is). See my thread on this problem for my solution.
Charles