g.
Service Temperature Tests: Bending over 13 mm 1/2 inchmandrel at
-50 degrees C -60 degrees F with no cracking. Expose sealed
typical metal lap joint to +176 degrees C +350 degrees F for 24
hours with no significant loss of original properties.
h.
Reaction to Metals:
Non-corrosive to metals
2.4
UNDERLAYMENT FOR WOOD SUBSTRATES
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NOTE: Include the following paragraph where
standing seam metal roof is applied directly to a
wood deck.
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Provide underlayment ASTM D 226, Type I perforated, covered by
water-resistant rosin sized building paper.
2.5
LABORATORY TESTS FOR PANEL FINISH
Previously manufactured panels of the same type and finish as proposed for
the project shall have been tested by an approved testing laboratory to
ensure conformance to specifications. The term "appearance of base metal"
refers to the aluminum base metal. Panels shall meet the following test
requirements.
2.5.1
Salt Spray Test
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NOTE: Use 2000-hour test for products to be
installed in marine environments such as at Adak,
Alaska.
**************************************************************************
Panels shall withstand a salt spray test for a minimum of [1000] [2000]
hours in accordance with ASTM B 117, including the scribe requirement in
the test. Immediately upon removal of the panel from the test, coating
shall receive a rating of 10, no blistering, as determined by ASTM D 714;
and a rating of 7, 2 mm 1/16 inch failure at scribe, as determined by ASTM
D 1654, Rating Schedule No. 1.
2.5.2
For formability test, when subjected to a 180 degree bend over a 3 mm 1/8
inch diameter mandrel in accordance with ASTM D 522, exterior coating film
shall show only microchecking of the exterior film and there shall be no
loss of adhesion.
2.5.3
Accelerated Weathering Test
Panels shall withstand an accelerated weathering test for a minimum of 2000
hours in accordance with ASTM G 23 or ASTM D 2565 without cracking,
peeling, blistering, loss of adhesion of the protective coating, or
corrosion of the base metal. Protective coating that can be readily
removed from the base metal with a penknife blade or similar instrument
shall be considered to indicate loss of adhesion.
SECTION 07612N
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