The head detail for a vertical lift breakaway sectional door at docks and drive-ins requires a minimum clearance of twelve inches. The door track routes upward from the door opening toward the roof structure. The exterior panel assembly is installed per the exterior wall types. An L6x6x1/4 angle with 3/4-inch Nelson studs spaced at twenty-four inches on center is anchored at the base.
DOOR OPENING SEE SCHEDULE VERTICAL LIFT (BREAKAWAY) @ DOCKS AND DRIVE-INS USE MIN. REQUIRED CLEARANCE 12± ROOF STRUCTURE EXTERIOR PANEL, SEE WALL TYPES 9 A702 L6X6X1/4 W3/4 NELSON STUD @ 24" O.C.
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