2.2
FABRICATION
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NOTE: Types of doors should be specified optionally
unless appearance is a factor or if certain doors
are unobtainable in ratings required. Manufacturer's
catalogs should be consulted before a selection is
made.
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Provide one of the following types:
2.2.1
Steel-Covered Composite
Flush panel consisting of a manufactured core material, such as
calcium-silicate block insulation, covered on both faces with a bonded
steel sheet not lighter than 0.9 mm thick 20 gage and on edges with a steel
perimeter channel not lighter than 1.2 mm thick 18 gage. Door panel edges
shall be encased in a steel channel not lighter than 1.8 mm thick 14 gage.
All joints in face sheets shall be backed by an interior steel "H" column
and covered with a steel, surface-applied faceplate or adequately
reinforced panels at connecting joints to provide a solid one piece unit
when installed.
2.2.2
Hollow-Metal
Flush panel consisting of a resin-impregnated, kraft honeycomb core covered
on both faces with a bonded steel sheet not lighter than [0.9 mm thick20
gage for door openings up to and including 3000 mm 10 feetin height] [and] [
1.2 mm thick 18 gage for door openings over 3000 mm 10 feet in height] and
on edges with a steel perimeter channel not lighter than 1.2 mm thick 18
gage. Door panel edges shall be encased in a steel channel not lighter than
1.8 mm thick 14 gage. All joints in face sheets shall be backed by an
interior steel "H" column and covered with a steel, surface-applied
faceplate or adequately reinforced panels at connecting joints to provide a
solid one piece unit when installed.
2.2.3
Corrugated Sheet Metal
Approximately 65 mm 2 1/2 inches thick consisting of two galvanized
corrugated steel sheets not lighter than 0.8 mm thick 22 gage each sheet.
The corrugations shall be approximately 65 mm 2 1/2 incheson centers and
shall run vertically on one side of the door and horizontally on the other.
A 2 mm 1/16 inch thick layer of noncombustible insulation material shall
be provided between the sheets. Steel frame composed of structural steel
shapes shall be provided at all edges of door leafs. Frame shall be
secured to corrugated sheets by through bolting or by welding.
2.2.4
Tin-Clad
Shall conform to UL 10A. Door shall have a core made up of layers of
boards nailed to each other and encased in terne- or zinc-coated plates
that are jointed together at their edges with nails driven through the
joints into the core.
2.3
OPERATION
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SECTION 08162
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