ASTM E1745-97(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E 1745 – 97 (Reapproved 2004)
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 (e) 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 Insulation 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-ElongationApparatus
which is water vapor permeance through unit thickness. Since
D 882 Test Methods for Tensile Properties of Thin Plastic
materials that provide resistance to vapor flow are never used
Sheeting
inunitthickness,thepreferredevaluationofbothmaterialsand
D 1709 Test Methods for Impact Resistance of Plastic Film
constructions is the permeance.
by the Free-Falling Dart Method
3.2.4 water-vapor permeance, n—the time rate of water
E96 Test Methods for Water Vapor Transmission of Mate-
vapor flow through unit area of the known thickness of a flat
rials
material or a construction normal to two specific parallel
E 154 Test Methods for Water Vapor Retarders Used in
surfaces induced by unit vapor pressure difference between the
Contact with Earth under Concrete Slabs, on Walls, or as
two surfaces under specific temperature and humidity condi-
Ground Cover
tions. See perm.
E 631 Terminology of Building Constructions
4. Classification
F 1249 Test Method for Water Vapor Transmission Rate
Through Plastic Film and Sheeting Using a Modulated
4.1 Materials shall be specified to conform to one of these
Infrared Sensor
three classes: A, B, or C, or specific requirements shall be
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-
fication, see Terminologies C 168 and E 631.
5.1 Specifications for materials shall include the following:
5.1.1 This specification number.
This specification is under the jurisdiction of ASTM Committee E06 on 5.1.2 ClassA,B,orC,oralternatively,specificperformance
Performance of Buildings and is the direct responsibility of Subcommittee E06.21
requirements for each of the properties listed in Table 1.
on Serviceability.
5.1.3 Performance requirements, if any, for special condi-
Current edition approved May 1, 2004. Published May 2004. Originally
tions (see 7.3).
approved in 1996. Last previous edition approved in 1997 as E 1745 – 97.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 1745 – 97 (2004)
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 or (0.3 gr/[h·ft ·in.·Hg]) (17 ng/[s·m ·Pa]) (0.3 gr/[h·ft ·in·Hg]) (17 ng/[s·m ·Pa]) (0.3 gr/[h·ft ·in.·Hg]) (17
...