2.1.5
Stainless Steel
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NOTE: Type 316 stainless steel offers additional
corrosion resistance through the addition of
molybdenum. It is often recommended for use in
salty or highly corrosive atmospheres. Since its
cost is greater than Types 302 or 304, Type 316
should be specified only when the project
requirements justify the additional cost.
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Conform to ASTM A 167, Type 302 or 304, and finish in accordance with the
NAAMM MFM conform to Metal Finishes Manual as follows:
a.
Concealed flashings:
Dead soft fully annealed, [2 D finish]
[[_____] finish].
b.
Exposed work:
[No. 4 finish] [[_____] finish] to match approved
sample.
2.1.6
Weathering High-Strength Low-Alloy Steel
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NOTE: Water draining or dripping from weathering
steel surface for the first two or three years while
the oxide coating is developing, will contain oxide
particles which may stain or streak adjacent
materials. Permanent provisions must be made
through design, detailing, and the selection of
materials and colors to accommodate or divert this
run-off water. Refer to weathering steel
manufacturer's recommendations for suggested methods
to prevent staining.
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Weathering steel shall be a high-strength, low-alloy steel conforming to
ASTM A 242/A 242M, ASTM A 588/A 588M, ASTM A 606, and ASTM A 607 as
applicable to the shapes and thicknesses required. In addition, the steel
shall be capable of developing a tightly adhered protective oxide coating
when left unpainted and subjected to atmospheric exposure. Steel shall
conform to the manufacturer's published mechanical properties and chemical
composition. [Protect weathering steel used for [_____] on the unexposed
side with a shop coat of paint.] Perform cleaning, surface preparation,
handling, bolting, riveting, and welding of weathering steel in strict
accordance with the specification and recommendations of the steel
manufacturer.
2.1.7
High-Strength, Low-Alloy Steel
Conform to ASTM A 572/A 572M for structural shapes, plates, and bars.
2.1.8
Metal Fasteners
Provide fasteners as specified in paragraph entitled "Fastener Metals for
Joining Various Metal Combinations" in "Part 2 - Products" of the AAMA
MCWM-1. [Fastener metals used in connection with weathering steel shall be
of type recommended by the weathering steel manufacturer.] Metals used for
fasteners shall be chemically and galvanically compatible with contiguous
SECTION 08900
Page 19
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