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.
Wall panels are available in several standard
colors. Custom color options shall only be
specified with Government approval. Where accent
colors are required, specify accordingly. Except
where interior surfaces receive a factory color
coat, the exposed reverse side of the panels
normally are provided with an off-white backer
coating.
The choice of coating for the interior face of
panels depends on environmental and aesthetic
considerations. Where a corrosive atmosphere is
anticipated within the structure, the finish should
be PVF2 in a thickness appropriate to the
environment. For utilitarian facilities with little
likelihood of a detrimental atmosphere, a standard
backer coat is appropriate. Backer coat is the
manufacturer's standard coating (usually polyester
based) applied to the back side of the metal panel.
This coating is normally a wash coating and is not
controlled for consistent color or gloss. Where
interior surfaces are concealed behind insulation,
liner panels, etc., provide only a primer coat.
These finishes should not be confused with a wash
coat which is used primarily to facilitate the coil
forming process and which is not closely controlled
for color, gloss or film thickness. The designer's
rational for using any special interior finish
should be reflected in the design analysis.
Energy considerations must be included in the choice
of standard colors for the wall panels. White or
light-colored siding surfaces are much better at
reflecting sunlight than darker surfaces,
transferring less heat to internal building spaces.
Coordinate the use of light-colored siding material
with the user.
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Panels shall have a factory applied [70 percent polyvinylidene fluoride
(PVDF2)] [polyvinylidene fluoride (PVDF)][_____] finish on the exposed
side. The exterior finish shall consist of a baked-on finish coat with an
appropriate prime coat. 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.] The exterior coating shall be a
nominal [1] [2] mil thickness consisting of a topcoat of not less than 0.02
mm (0.75 mil)[_____] dry film thickness and the paint manufacturer's
recommended primer of not less than [0.005 mm (0.2 mil)][_____] thickness.
[Provide manufacturer's standard factory-applied clear coat system over
color finish coat on the exterior side.] The interior color finish shall
consist of [the same coating and dry film thickness as the exterior] [a
SECTION 07413
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