PART 3
EXECUTION
3.1
FABRICATION
3.1.1
Door Sections
Provide vertical and horizontal door section members constructed of
structural steel angle or channel shapes. Cover door section exteriors
with sheet steel not lighter than 1.8 mm thick 14 gage, bolted, plug
welded, or edge welded to frame at not more than 230 mm 9 inches on
centers. Provide intermediate horizontal or vertical stiffeners so the
maximum unsupported area of sheet is 1.8 square meters 20 square feet.
Corners and intersections of frame members shall be welded and ground
smooth on exposed surfaces. Welds shall develop the full strength of frame.
3.1.1.1
Insulated Sections
Door sections shall be insulated with fibrous glass or plastic foam to
provide a "U" factor of 0.14 or less. Interior of door sections shall be
covered with steel sheets not lighter than 0.6 mm thick 24 gage to
completely enclose the insulating material.
3.1.1.2
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 steel sections.
3.1.2
Guides and Jamb Plates
Door sections shall run in structural steel guides, securely fastened to
the counterweight tower and to the idler tower, which shall be attached to
the building construction. The counterweight enclosure shall extend
approximately to the same height as the guides. Set back guides and tower
faces on walls to provide clear door opening unobstructed by door guides,
except when indicated otherwise.
3.1.3
Hardware
Door sections shall be supported by chain or steel cable with a safety
factor of five. The sheaves over which the chain or cable passes to the
door shall have permanently sealed precision bearings. Cast-iron
counterweights shall be stacked on a steel weight rod or in a special
container. The counterweight tower shall be enclosed with a removable
steel cover not lighter than 1.8 mm thick 14 gage to a height of 2150 mm 7
feet above the floor. Provide doors with a positive locking device and
cylinder lock with two keys.
3.1.4
Glazing
Provide glass panels where indicated. Install panels using rubber gaskets
as standard with the door manufacturer.
3.2
INSTALLATION
NFPA 70. Install doors in accordance with approved detail drawings and
manufacturer's instructions. Accurately locate anchors and inserts for
guides, brackets, [motors,] [switches,] hardware, and other accessories.
Upon completion, doors shall be weathertight and free from warp, twist, or
SECTION 08370
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