2.3.2.2
Flush Doors
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NOTE: The optional types of door construction may
not be suitable for use in all facilities. Delete
any option listed not considered desirable for a
particular usage or for use in a particular facility.
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Use facing sheets with [a vertical ribbed] [an embossed] [or] [a plain
smooth] surface. Use one of the following constructions:
a.
A phenolic resin-impregnated kraft paper honeycomb core,
surrounded at edges and around glass and louvered areas with
extruded aluminum shapes. The impregnation of core shall have a
minimum of 18 percent resin content. Provide sheet aluminum door
facings, not less than 0.8 mm 0.032 inch thick laminated to a 2.5
mm 0.10 inch thick tempered hardboard backing, and bond the
backing to the honeycomb core. Bond facing sheets to core under
heat and pressure with a thermosetting adhesive, and mechanically
lock to the extruded edge members.
b.
A phenolic resin-impregnated kraft paper honeycomb core. Use
aluminum facing sheets not less than 1.25 mm 0.050 inch thick and
form into two pans which will eliminate seams on the faces. Bond
honeycomb core to the face sheets using an epoxy resin or contact
cement-type adhesive.
c.
A solid fibrous core, surrounded at edges and around glass and
louvered areas and cross-braced at intermediate points with
extruded aluminum shapes. Use aluminum facing sheets of not less
than 1.25 mm 0.050 inch thickness. Bond facing sheets to core
under heat and pressure with a thermosetting adhesive, and
mechanically lock to the extruded edge members.
d.
Form from extruded tubular stiles and rails mitered at corners,
reinforce, and continuously weld at miters. Facing sheets shall
consist of 0.8 mm 0.032 inch thick sheet aluminum internally
reinforced with aluminum channels or Z-bars placed horizontally
not more than 400 mm 16 inches apart and extending full width of
panel. Fit spaces between reinforcing with sound-deadening
insulation. Facing sheets shall finish flush with faces of stiles
and rails and be welded to reinforcing bars or channels and to
stiles and rails.
e.
Form from an internal grid system composed of extruded aluminum
tubular sections. Provide extruded aluminum tubular sections at
both sides, and at perimeters of louver and glass cutouts.
Provide three extruded aluminum tubular sections at top and bottom
of door. Wall thickness of tubular sections shall be not less than
2.25 mm 0.09 inch except that lock rail shall be not less than 3 mm
0.125 inch thick, hinge lock rail shall be not less than 3 mm
0.125 inch thick, and hinge rail edge shall be not less than 5 mm
0.19 inch thick. Fill spaces in door with mineral insulation.
Facing sheets shall be of aluminum not less than 2.25 mm 0.09 inch
thick.
f.
Form from extruded aluminum members at top and bottom, both sides,
SECTION 08120
Page 8
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