sealant shall be [colored to match the applicable building color] [clear]
and shall cure to a rubber like consistency.
2.9
GASKETS AND INSULATING COMPOUNDS
Gaskets and insulating compounds shall be nonabsorptive and suitable for
insulating contact points of incompatible materials. Insulating compounds
shall be nonrunning after drying.
2.10
VAPOR RETARDER
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NOTE: The term vapor retarder has been selected to
describe the membrane used to reduce moisture vapor
transmission. The location of the vapor retarder is
determined by the climate and the building type.
The vapor retarder goes on the side of the
insulation with the greatest vapor pressure during
the course of the year; therefore it goes on the
outside in a climate predominately warm, and on the
inside in a climate predominately cool. The
designer should determine the most appropriate
application/installation of the vapor retarder based
on project circumstances. See TM 5-810-1 for humid
climate definition.
Detail the use of insulation on the drawings.
Coordinate with Sections 07412 NON-STRUCTURAL METAL
ROOFING and 07416 STRUCTURAL STANDING SEAM METAL
ROOF (SSSMR) SYSTEM for vapor retarder requirements.
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2.10.1
Vapor Retarders as Integral Facing
Insulation facing shall have a permeability of [1.15] [_____] ng per
Pa-second-square meter [0.02] [_____] perm or less when tested in
accordance with ASTM E 96. Facing shall be [white] [black] reinforced
polypropylene kraft laminate (PSK). Facings and finishes shall be factory
applied.
2.10.2
Vapor Retarders Separate from Insulation
Vapor retarder material shall be polyethylene sheeting conforming to the
requirements of ASTM D 4397. A single ply of 0.25 mm 10 mil polyethylene
sheet; or, at the option of the Contractor, a double ply of 0.15 mm 6 mil
polyethylene sheet shall be used. A fully compatible polyethylene tape
shall be provided which has equal or better water vapor control
characteristics than the vapor retarder material. A cloth industrial duct
tape in a utility grade shall also be provided to use as needed to protect
the vapor retarder from puncturing.
2.11
SHOP PRIMING
Ferrous surfaces shall be cleaned of oil, grease, loose rust, loose mill
scale, and other foreign substances and shop primed. Primer coating shall
be in accordance with the manufacturer's standard system.
SECTION 13121
Page 17
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