of not less than 3.7 mm 0.145 inch with a shank length of not less than 12
mm 1/2 inch for fastening panels to steel and not less than 25 mm one inch
for fastening panels to concrete.
2.3.5.4
Blind Rivets
Provide aluminum rivets with 5 mm 3/16 inch nominal diameter shank or
stainless steel rivets with 3 mm 1/8 inch nominal diameter shank. Rivets
shall be threaded stem type if used for other than the fastening of trim.
Provide hollow stem rivets with closed ends.
2.3.5.5
Bolts
Provide bolts not less than 6 mm 1/4 inch diameter, shouldered or plain
shank as required, with proper nuts.
2.3.6
Gutters
Provide complete with mitered corners, end pieces, and special pieces that
may be required. Expansion-type slip joints shall be provided at the
center of the runs and at intervals of not more than 9800 mm 32 feet for
aluminum and not more than 12 200 mm 40 feet for steel. Provide water
tight seal at all other joints. Provide gutters below the slope line of
the roof, to allow snow and ice to slide clear. Provide hangers and
fastenings from a metal compatible with the gutters. Space hangers not
more than 900 mm 36 inches apart.
2.3.7
Downspouts
Provide cross sectional area not less than the size of gutter indicated and
complete including elbows and offsets. Provide downspouts in approximately
3000 mm 10 foot lengths; end joints shall telescope not less than 12 mm 1/2
inch, and longitudinal joints shall be locked. Provide gutter outlets with
stainless steel wire ball strainers of a standard type. Position
downspouts not less than 12 mm 1/2 inch away from walls and fasten to the
walls at top, bottom, and at not to exceed 1500 mm 5 foot centers
intermediately between with manufacturer's standard type leader straps, or
concealed type fasteners. Form straps and fasteners from a metal
compatible with the downspouts. [Provide open downspout.]
2.3.8
Circular Roof Ventilators
Provide circular roof ventilators fabricated of aluminum or zinc-coated
steel with [manufacturer's standard factory finish, color as indicated]
[the same finish specified in paragraph entitled "Finish," color as
indicated] [mill finish], furnished with removable [bird] [insect] screens
[and] [chain or cable operated dampers]. Provide rigid weathertight
ventilators free from vibration upon installation.
2.3.9
Continuous (Ridge) Roof Ventilators
Provide ventilators fabricated of aluminum, zinc-coated steel, or
aluminum-zinc alloy coated steel, of [manufacturer's standard factory
finish, color as indicated] [the same finish specified in paragraph
entitled "Finish," color as indicated] [mill finish], complete with braces,
[chain-operated dampers], and bird screening. Provide ventilators in
sections 8 or 10 feet 2400 or 3000 mm long, braced at midlength. Join
sections together with splice plates of the same material as the sections.
Provide end closures for each section. [Throat size (vent opening) shall
SECTION 13120
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