PART 3
EXECUTION
3.1
EXAMINATION
Examine surfaces to receive standing seam metal roofing and flashing.
Provide plumb and true surfaces, clean, even, smooth and as dry as
possible. Ensure that surfaces are free from defects and projections which
might affect the installation. Report unsuitable conditions to Contracting
Officer.
3.2
PROTECTION OF DISSIMILAR METALS
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NOTE: Galvanized steel will deteriorate in humid
conditions, coastal areas and should be considered a
dissimilar metal unless it is known that the contact
surface will remain dry and free from condensation.
Wood which has been pressure treated will also react
with aluminum. Provide protection if aluminum could
contact treated wood.
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Where an aluminum component is in contact with, fastened to, or contacted
by drainage from dissimilar metals other than stainless steel, give such
dissimilar metals one of the following treatments:
a.
A heavy brush coat of primer followed by two coats of aluminum
metal and masonry paint.
b.
A heavy coat of alkali-resistant bituminous paint.
c.
Separate contact surfaces with non-absorptive tape or gasket.
3.2.1
Contact with Masonry
Where aluminum is in contact with masonry, concrete, or plaster, apply a
heavy coat of alkali-resistant bituminous paint.
3.2.2
Contact with Wood
Where aluminum is in contact with wood or other absorptive material subject
to wetting, or with wood treated with a preservative not compatible with
aluminum, seal joints with sealing compound and apply one heavy brushcoat
of aluminum pigmented bituminous paint.
3.3
INSTALLATION
Install in accordance with approved manufacturer's erection instructions
shop drawings, and diagrams, except as specified otherwise herein. Provide
panels in full and firm contact with clips. Obtain approval prior to
installation on prefinished panels cut in the field, and factory applied
coverings or coatings that were repaired after being abraded or damaged
during handling or installation. Make repairs with material of same color
as weather coating. Completely seal openings through panels. Correct
defects or errors in materials in an approved manner. Replace materials
which cannot be corrected in an approved manner with new materials. Provide
molded closure strips where indicated and where necessary for weathertight
construction. [Use shims as required to ensure clip line is true.] Use a
spacing gage at each row of panels to ensure that panel width is not
SECTION 07612N
Page 20
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