2.3.20
Gaskets and Insulating Compounds
Gaskets and insulating compounds shall be nonabsorptive and suitable for
insulating contact points of incompatible materials. Insulating compounds
shall be nonrunning after drying.
2.4
FINISH
2.4.1
Shop Painting
Ferrous metal work, except factory-finished work, zinc-coated work,
aluminum-coated work, and work specified to be painted herein, shall be (1)
cleaned of dirt, rust, scale, loose particles, grease, oil, and other
deleterious substances; (2) phosphate treated; and (3) then be given one
coat of an approved rust-inhibiting primer paint of the type standard with
the metal building manufacturer.
2.4.2
Factory Color Finish
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NOTE: Specify a high performance coating by giving
chemical name of paint and percentage of resin in
the coating. 70 percent resin fluoropolymer is
Kynar. Edit listed tests to include appropriate
requirements. A 0.02 mm 0.8 mil fluoropolymer clear
protection coat is used for special colors or
metallic finish. It is part of Pittsburgh Paints
Duranar system.
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NOTE: Factory color finish will be specified except
when the buildings are to be used for temporary
purposes or where mill finish aluminum panels
provide an acceptable appearance. If factory color
finish is not required, document the rationale for
the decision in the design analysis and remove this
paragraph.
The US Metal Building Industry offers a variety of
color finishes to protect the metal panels against
chemical corrosion and ultraviolet radiation; to
provide long life with minimum maintenance plus
acceptable weathering and color retention; and to
assure chalk, fade, and mar resistance. Some of the
most widely used coatings include, but are not
limited to, the following:
a. Polyvinylidene fluoride (PVF2); a nominal 0.025
mm (1 mil) thick coating modified with a proprietary
resin for toughness; it may be used in most
environments.
b. Silicone-modified polyester (SMP); a thermoset
coating system composed of polyester resin modified
by copolymerization with a functional silicone resin
intermediate designed for added protection against
chemical corrosion and ultraviolet radiation.
SECTION 13120
Page 35
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