2.4.4
GASKETS AND INSULATING COMPOUNDS
Nonabsorptive and suitable for insulating contact points of incompatible
materials. Insulating compounds shall be nonrunning after drying.
[2.5
THERMAL INSULATION
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NOTE: Insulation should be included in appropriate
section. Most manufacturers recommend batts with
minimum thickness of 38 mm 1 1/2 inches for standing
seam systems to minimize condensation on underside
of roofing sheets and for sound attenuation. Spacer
blocks should be required with insulation. 100 mm
Four inches (R 25) is the recommended maximum
thickness.
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Flexible blanket, rigid, or semi-rigid faced with a flexible vapor
retarder. Insulation and facing shall have a flame-spread rating of 50 or
less in accordance with ASTM E 84. Vapor retarder facing shall have a
permeance rating of 0.05 perm or less. Provide a thermal resistance "R"
value of [_____] or more. [Exposed insulation shall have a white
nondusting and nonshedding finish.] Facings [and finishes] shall be
factory-applied.
][2.6
UNDERLAYMENT FOR WOOD SUBSTRATES
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NOTE: Include this article where roof coverings are
applied to wood decks.
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ASTM D 226, Type I perforated, covered by water-resistant rosin sized
building paper.
]2.7
LINER PANELS
Fabricate liner panels of the same material as roof panels, and formed or
patterned to prevent waviness and distortion. Liner panels shall have a
factory applied, one mil thick minimum painted coating on the inside face
and a prime coat on the liner side.
PART 3
EXECUTION
3.1
EXAMINATION
Examine surfaces to receive standing seam metal roofing and flashing.
Ensure that surfaces are plumb and true, clean, even, smooth, as dry and
free from defects and projections which might affect the installation.
3.2
PROTECTION FROM CONTACT WITH DISSIMILAR MATERIALS
3.2.1
Cementitious Materials
Paint metal surfaces which will be in contact with mortar, concrete, or
other masonry materials with one coat of alkali-resistant coating such as
heavy-bodied bituminous paint.
SECTION 07611N
Page 20
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