of [_____] or more as measured in accordance with ASTM C 236.
d.
Provide insulation containing 20 percent or greater recovered
material which has been diverted from solid waste, but not
including material reused in a manufacturing process. Where two
materials have the same price and performance, provide the one
containing the higher recovered material content.
2.3.15.4
Insulation Retainers
Retainers shall be type, size and design necessary to adequately hold the
insulation and to provide a neat appearance. Metallic retaining members
shall be nonferrous or have a nonferrous coating. Nonmetallic retaining
members, including adhesives used in conjunction with mechanical retainers
or at insulation seams, shall have a fire resistance classification not
less than that permitted for the insulation.
2.3.16
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
Roofing (SSSR)" vapor retarder requirements.
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2.3.16.1
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.
2.3.16.2
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.
SECTION 13120
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