[2.4.1.2
Aluminum Sections
At the Contractor's option, door sections may be constructed of aluminum in
lieu of steel. Aluminum sections shall, as a minimum, provide the same
structural and thermal properties as specified for steel sections.
][2.4.2
Aluminum Panel Overhead Doors
Door sections shall be of panel construction with extruded aluminum stiles
and rails with aluminum [and glass] panels. Stiles and rails shall have a
minimum wall thickness of 1.5 mm 0.060 inch. Meeting rails shall have
interlocking joints to ensure a weathertight closure and alignment for full
width of door. Sections shall be of the height indicated or the
manufacturer's standard, but the height of an intermediate section shall
not exceed 600 mm 24 inches. Bottom sections may be varied to suit door
height, but shall not exceed 750 mm 30 inches in height. luminum panels
shall be not less than 1.0 mm 0.040 inch in thickness. Install panel using
a continuous vinyl gasket and snap-in type of aluminum or vinyl glazing
bead. [Install glass panels as specified for aluminum panels.]
]2.4.3
Tracks
Provide galvanized steel tracks not lighter than 1.8 mm thick for 50 mm 14
gage for 2 inch tracks and not lighter than 2.5 mm thick for 75 mm 12 gage
for 3 inch tracks. Provide vertical tracks with continuous steel angle not
lighter than 2.1 mm thick 13 gage for installation to walls. Incline
vertical track through use of adjustable brackets to obtain a weathertight
closure at jambs. Reinforce horizontal track with galvanized steel angle;
support from track ceiling construction with galvanized steel angle and
cross bracing to provide a rigid installation.
2.4.4
Hardware
Provide hinges, brackets, rollers, locking devices, and other hardware
required for complete installation. Roller brackets and hinges shall be 14
gage galvanized steel. Rollers shall have ball bearings and case-hardened
races. Provide reinforcing on doors where roller hinges are connected.
Provide a positive locking device and cylinder lock with two keys on
manually operated doors.
2.4.5
Counterbalancing
Counterbalance doors with an oil-tempered, helical-wound torsional spring
mounted on a steel shaft. Spring tension shall be adjustable; connect
spring to doors with cable through cable drums. Cable safety factor shall
be at least 7 to 1.
2.5
MANUAL OPERATORS
2.5.1
Pushup Operators
Provide lifting handles on both sides of door. The force required to
operate the door shall not exceed 11.25 kilograms 25 pounds. Provide
pulldown straps or ropes at bottom of doors over 2130 mm 7 feet high.
2.5.2
Chain Hoist Operators
Provide a galvanized, endless chain operating over a sprocket.
Extend
SECTION 08361
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