ASTM E1745-97

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: E 1745 – 97
Standard Specification for
Plastic Water Vapor Retarders Used in Contact with Soil or
Granular Fill under Concrete Slabs
This standard is issued under the fixed designation E 1745; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Definitions of Terms Specific to This Standard:
3.2.1 perm, n—the time rate of water vapor migration
1.1 This specification covers flexible, preformed sheet
through a material or a construction of one grain per hour,
membrane materials to be used as vapor retarders in contact
square foot, inch of mercury pressure difference.
with soil or granular fill under concrete slabs.
3.2.1.1 Discussion—If a specification states that a one perm
1.1.1 Atask group in Subcommittee E06.21 is working on a
limit is required, the same flow rate will be obtained from the
specification for bituminous vapor retarders.
following relationships:
1.2 The specified tests are conducted on new materials and
1 perm = 1 grain/h · ft in. · Hg (inch·pound)
materials that have been conditioned or exposed to simulate
;12 2
= 57.2 10 kg/(Pa· s · m ) (SI fundamental units)
potential service conditions.
= 57.2 ng/(Pa · s · m ) (SI frequently used)
= 0.66g/24h·m · mm Hg (SI has been used but is now obso-
2. Referenced Documents
lete)
2.1 ASTM Standards:
3.2.2 vapor retarder, n—(formerly vapor barrier) a material
C 168 Terminology Relating to Thermal Insulating Materi-
or construction that impedes the transmission of water vapor
als
under specified conditions.
D 828 Test Method for Tensile Properties of Paper and
3.2.3 water vapor permeability, n—a property of material
Paperboard Using Constant-Rate-of-Elongation Appara-
which is water vapor permeance through unit thickness. Since
tus
materials that provide resistance to vapor flow are never used
D 882 Test Methods for Tensile Properties of Thin Plastic
in unit thickness, the preferred evaluation of both materials and
Sheeting
constructions is the permeance.
D 1709 Test Methods for Impact Resistance of Plastic Film
3.2.4 water-vapor permeance, n—the time rate of water
by the Free-Falling Dart Method
vapor flow through unit area of the known thickness of a flat
E96 Test Methods for Water Vapor Transmission of Mate-
material or a construction normal to two specific parallel
rials
surfaces induced by unit vapor pressure difference between the
E 154 Test Methods for Water Vapor Retarders Used in
two surfaces under specific temperature and humidity condi-
Contact with Earth under Concrete Slabs, on Walls, or as
tions. See perm.
Ground Cover
4. Classification
E 631 Terminology of Building Constructions
F 1249 Test Method for Water Vapor Transmission Rate
4.1 Materials shall be specified to conform to one of these
Through Plastic Film and Sheeting Using a Modulated
three classes: A, B, or C, or specific requirements shall be
Infrared Sensor
specified in one or more of the properties listed in Table 1.
3. Terminology
5. Specifying Information
3.1 Definitions—For definitions of terms used in this speci-
5.1 Specifications for materials shall include the following:
fication, see Terminologies C 168 and E 631C 168E 631.
5.1.1 This specification number.
5.1.2 ClassA,B,orC,oralternatively,specificperformance
requirements for each of the properties listed in Table 1.
This specification is under the jurisdiction of ASTM Committee E-6 on 5.1.3 Performance requirements, if any, for special condi-
Performance of Buildings and is the direct responsibility of Subcommittee E06.21
tions (see 7.3).
on Serviceability.
Current edition approved March 10, 1997. Published May 1997. Originally
6. Lap Sealing
published as E 1745 – 96. Last previous edition E 1745 – 96.
Annual Book of ASTM Standards, Vol 04.06. 6.1 The producer shall provide instructions for lap sealing,
Annual Book of ASTM Standards, Vol 15.09.
including minimum width of lap, method of sealing, and either
Annual Book of ASTM Standards, Vol 08.01.
supply or specify suitable products for lap sealing.
Annual Book of ASTM Standards, Vol 04.11.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
E1745–97
TABLE 1 Properties for Specified Performance Classes
Class A Class B Class C
US Units SI Units US Units SI Units US Units SI Units
Water vapor 0.3 perms 0.3 perms 0.3 perms
permeance
2 2 2 2 2 2
(E 154, Section 7 (0.3 gr/[h·ft ·in.·Hg]) (17 ng/[s·m ·Pa
...