greater expansion of aluminum must be considered in
the design. Where steel panels are used in coastal
environments, enhanced PVDF2 or other premium
coatings shall be specified. Increased PVDF2
coating thicknesses and or addition of a
factory-applied clear coat over the color finish
will enhance coating system performance.
Roof panels are available in several standard
colors. Custom color options shall only be
specified with Government approval. Where accent
colors are required, specify accordingly.
Energy considerations may be a consideration in the
color choice for the roof panels. White or
light-colored roofing surfaces are much better at
reflecting sunlight than darker surfaces.
Coordinate color specification and selection with
the user.
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Provide factory-applied, thermally cured coating system on roof panel
surfaces. Provide exterior coat of primer and [70 percent polyvinylidene
fluoride resin] [_____] color finish coat on the exposed side. Prime coat
shall be not less than 0.005 mm (0.2 mil)[_____]. Color finish coat shall
be not less than 0.02 mm (0.8 mil)[_____]. Total color coating system
thickness shall be not less than [0.025 mm (1 mil)][_____] and with any
additional primer and finish coat thickness required to meet the color
finish performance requirements specified. [Provide manufacturer's
standard factory-applied clear coat system over color finish coat.]
Underside coating shall consist of roof panel manufacturer recommended
protective backer coat suitable for the application conditions, not less
than 0.008 mm (0.3 mil) thick unless approved otherwise by the Contracting
Officer. Finish coat color shall [be ______][be as selected by Contracting
Officer from manufacturer standard [and custom] color charts][match the
color indicated [on the drawings] [in Section 09915 COLOR SCHEDULE]]. The
exterior color finish shall meet the performance requirements specified.
2.2.1
Factory Color Finish Performance Requirements
2.2.1.1
Cyclic Salt Fog/UV Test
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NOTE: The results of the salt spray test will vary
depending on the thickness of the coating.
Normally specify less than 3 mm (1/8 inch) creepage
from scripe for steel panels and 1.5 mm (1/16 inch)
creepage from scripe for aluminum panels.
For projects located in high temperature and regular
high humidity service conditions or other severely
corrosive environment, or where premium finish would
be justified, the following test requirement
selections should be made for steel panels and
appropriate coating type and thickness specified:
Rating of 10, no blisters in field
Rating of 7, 1.5 mm (1/16 inch) edge creep
SECTION 07412
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