Big Over Head Garage Doors

[TNottingham]

Does anybody know of a good place to buy large style garage doors,
we are building a 51 x 56 quonset hut style building. We are located in middle colorado and we need a door around 18 x 18 or 18 x 20 wide. thanks

 

[tdkkart]

You might look at airplane hangar style doors:
http://www.bifold.com/photo-agriculture-doors.php

I've seen them used in a couple Ag buildings, they work well and you don't have tracks or openers clogging up your ceiling space.