Height

Most shop doors roll up past the 14' opening. You should be fine. Shop door openings are not like residential garage doors where the bottom of the door stop inches under the tallest point. You will need min 16' walls to allow the door to roll into itself. Unless you get the door that is on a track system. Kind of like a loading dock door. 1 person mentioned to allow space to access your roof. Then your peak of the roof needs to be at least 20' tall with at least 16' walls.