2.2
FABRICATION
2.2.1
Curtains
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NOTE: For security applications, steel slats as
heavy as 1.8 mm thick 14 gage may be specified. For
severe climates, 38 mm 1 1/2 inch thick insulated
slats with a "U" factor of 0.11 are available from
some manufacturers.
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NOTE: When antiterrorism/force protection minimum
measures are required, specify minimum frame bites
and non-thermal, laminated glass vision panels for
exterior rolling service doors and include reference
to Section 08800, "Glazing".
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Shall be formed of interlocking galvanized steel slats of shapes standard
with the manufacturer, except that slats for exterior doors shall be flat
type. Curtain shall roll up on a barrel supported at head of opening on
brackets and be balanced by a torsional spring system in the barrel.
[[Slats for doors less than 4500 mm 15 feet wide shall be not lighter than
0.8 mm thick 22 gage;] [slats for doors from 4500 mm 15 feet wide to 6400 mm
21 feet wide shall be not lighter than 0.9 mm thick 20 gage;] [slats for
doors 6400 mm 21 feet wide and wider shall be not lighter than 1.2 mm thick
18 gage].] [Slats shall be of the gage required for the width indicated
and the wind pressure specified above.] [Exterior door glazing shall have
a minimum frame bite of 9.5 mm3/8 inch for structurally glazed window
systems and 25 mm1 inch for vision panels that are not structurally glazed.
Provide non-thermal, laminated glass vision panels in doors indicated for
glazing. Glazing is specified in Section 08800.] [Slats for exterior doors
shall be insulated with not less than 13 mm 1/2 inch thick polyurethane or
polyisocyanurate foam insulation. Interior side of insulation shall be
covered with interlocking galvanized steel slats not lighter than 0.6 mm
thick 24 gage.]
2.2.2
Endlocks [and Windlocks]
The ends of each slat or each alternate slat shall have malleable iron or
galvanized steel endlocks of manufacturer's stock design. [In addition to
endlocks, exterior doors which are more than 4875 mm 16 feet wide or which
have a design wind load of more than 0.96 kilopascals 20 pounds per square
foot, shall have windlocks or integral slat lugs of manufacturer's standard
design at ends of at least every sixth slat. Windlocks or lugs shall
prevent curtain from leaving guide because of deflection from wind pressure
or other forces.]
2.2.3
Bottom Bar
The curtain shall have a steel bottom bar consisting of two angles of equal
weight, one on each side, or an equivalent extruded aluminum section,
fastened to bottom of curtain. Do not use aluminum on doors more than 4875
mm 16 feet wide. In addition, exterior doors shall have a compressible and
replaceable rubber, neoprene, or vinyl weather seal attached to bottom bar.
[Attach a combination compressible seal and fail-safe safety device for
stopping and reversing the travel of the door to the bottom bar of doors
SECTION 08331N
Page 7
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