the commercial roll-up doors cost about $3500 each in my area (NC), vs 1200
or 1600 for the more normal sectioned door. The roll ups also are not
insulated; my shop is A/C'd and heated, so that was even more important.
they open up to within 6 inches of the 12 ft ceiling (horizontal); the
sloped arrangement is used successfully on my friend's shop with sloped
<<Can't find an example at the moment, but I know I've seen large doors that
up into a ball above the opening instead of staying flat, too.