efficient large door for *infrequent* access to shop

I need a “full size garage” size entrance to a shop space I’m building.  It will only very intermittently – but it must have a ~10′ high, ~12′ wide “door”. … I need a “full size garage” size entrance to a shop space I’m building.  It will only very intermittently – but it must have a ~10′ high, ~12′ wide “door”. …Read MoreGreenBuildingAdvisor