EN ISO 12572:2001
(Main)Hygrothermal performance of building materials and products - Determination of water vapour transmission properties (ISO 12572:2001)
Hygrothermal performance of building materials and products - Determination of water vapour transmission properties (ISO 12572:2001)
This standard specifies a method based on cup tests for determining the water vapour permeance of building products and the water vapour permeability of building materials under isothermal conditions. Different sets of test conditions are specified.
The general principles are applicable to all hygroscopic and non hygroscopic building materials and products, including those with facings and integral skins. Annexes give details of test methods suitable for different material types. This standard is not applicable in the case of test specimens with water vapour diffusion-equivalent air layer thickness values less than 0,1 m, as a result of increasing uncertainty in the measurement results. If the measured water vapour diffusion-equivalent air layer thickness is greater than 1500 m the material can be considered impermeable.
The results obtained by this method are suitable for design purposes, production control and for inclusion in product specifications.
Wärme- und feuchtetechnisches Verhalten von Baustoffen und Bauprodukten - Bestimmung der Wasserdampfdurchlässigkeit (ISO 12572:2001)
Diese Norm legt ein Verfahren zur Bestimmung des Wasserdampfdiffusions-Durchlasskoeffizienten von Bauprodukten und des Wasserdampfdiffusionsleitkoeffizienten von Baustoffen unter isothermischen Bedingungen fest, das auf Prüfungen mit Prüfgefäßen basiert. Verschiedene Prüfbedingungen werden festgelegt.
Die allgemeinen Prinzipien gelten für alle hygroskopischen und nicht hygroskopischen Baustoffe und -produkte einschließlich solcher Stoffe und Produkte mit Beschichtungen oder Häuten. Einzelheiten zu Prüfverfahren, die für einzelne Stoffarten geeignet sind, sind in den Anhängen angegeben. Aufgrund der zunehmenden Messunsicherheit gilt diese Norm nicht für Probekörper mit einer wasserdampfdiffusionsäquivalenten Luftschichtdicke geringer als 0,1 m. Übersteigt die gemessene wasserdampfdiffusionsäquivalente Luftschichtdicke 1500 m, gilt der Stoff als wasserdampfundurchlässig.
Die Ergebnisse, die man nach diesem Verfahren erhält, sind geeignet für die Bemessung, zur Produktionskontrolle und zur Aufnahme in Produktspezifikationen.
Performance hygrothermique des matériaux et produits pour le bâtiment - Détermination des propriétés de transmission de la vapeur d'eau (ISO 12572:2001)
La présente norme spécifie une méthode basée sur des essais en coupelle pour déterminer la perméance à la vapeur d'eau des produits pour le bâtiment ainsi que la perméabilité à la vapeur d'eau des matériaux pour le bâtiment dans des conditions isothermes. Différentes séries de conditions d'essai sont spécifiées. Les principes généraux sont applicables à tous les matériaux et produits de bâtiment hygroscopiques et non hygroscopiques, y compris ceux qui possèdent des parements et des revêtements intégrés. Les annexes fournissent des détails sur des méthodes d'essai convenant pour différents types de matériaux. La présente norme ne s'applique pas dans le cas d'éprouvettes dont l'épaisseur d'air équivalente pour la diffusion de la vapeur d'eau est inférieure à 0,1 m, du fait de l'incertitude croissante sur les résultats de mesure. Si l'épaisseur d'air équivalente mesurée est supérieure à 1 500 m, le matériau peut être considéré comme imperméable. Les résultats obtenus par cette méthode peuvent être utilisés pour la conception, pour le contrôle de la production et pour insertion dans les spécifications de produits.
Higrotermalno obnašanje gradbenih materialov in proizvodov - Ugotavljanje lastnosti za prehod vodne pare (ISO 12572:2001)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2002
Higrotermalno obnašanje gradbenih materialov in proizvodov - Ugotavljanje
lastnosti za prehod vodne pare (ISO 12572:2001)
Hygrothermal performance of building materials and products - Determination of water
vapour transmission properties (ISO 12572:2001)
Wärme- und feuchtetechnisches Verhalten von Baustoffen und Bauprodukten -
Bestimmung der Wasserdampfdurchlässigkeit (ISO 12572:2001)
Performance hygrothermique des matériaux et produits pour le bâtiment - Détermination
des propriétés de transmission de la vapeur d'eau (ISO 12572:2001)
Ta slovenski standard je istoveten z: EN ISO 12572:2001
ICS:
91.100.01 Gradbeni materiali na Construction materials in
splošno general
91.120.30 =DãþLWDSUHGYODJR Waterproofing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 12572
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2001
ICS 91.120.10
English version
Hygrothermal performance of building materials and products -
Determination of water vapour transmission properties (ISO
12572:2001)
Performance hygrothermique des matériaux et produits Wärme- und feuchtetechnisches Verhalten von Baustoffen
pour le bâtiment - Détermination des propriétés de und Bauprodukten - Bestimmung der
transmission de la vapeur d'eau (ISO 12572:2001) Wasserdampfdurchlässigkeit (ISO 12572:2001)
This European Standard was approved by CEN on 18 October 2000.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12572:2001 E
worldwide for CEN national Members.
Page 2
Contents
Page
Foreword 3
1 Scope 4
2 Normative references 4
3 Definitions, symbols and units 5
4 Principle 7
5 Apparatus 7
6 Test specimens 8
7 Procedure 10
8 Calculation and expression of results 13
9 Accuracy of measurement 15
10 Test report 17
Annex A (normative) Methods suitable for self supporting materials 19
Annex B (normative) Methods suitable for loose fills 21
Annex C (normative) Methods suitable for membranes and foils 23
Annex D (normative) Methods suitable for mastics and sealants 24
Annex E (normative) Methods suitable for paint, varnishes, etc. 26
Annex F (normative) Correction for the effect of a masked edge of a specimen 27
Annex G (normative) Correction for resistance of air layers 28
Annex H (informative) Weighing repeatability, weighing interval and specimen size needed
to achieve desired accuracy 29
Annex J (informative) Conversion table for water vapour transmission units 30
ANNEX ZA (normative) Normative references to international publications with their
relevant European publications 31
ANNEX ZB (informative) Informative references to international publications with their
relevant European publications 31
Bibliography 32
Page 3
Foreword
The text of EN ISO 12572:2001 has been prepared by Technical Committee CEN/TC 89
"Thermal performance of buildings and building components", the secretariat of which is held
by SIS, in collaboration with Technical Committee ISO/TC 163 "Thermal insulation".
This European Standard shall be given the status of a national standard, either by publication
of an identical text or by endorsement, at the latest by December 2001, and conflicting
national standards shall be withdrawn at the latest by December 2001.
This standard is one of a series of standards which specify test methods for the thermal and
moisture related properties of building materials and products.
The European publications to be used instead of the International Standards listed in clause 2
are given in normative annex ZA, which is an integral part of this European Standard.
The annexes A, B, C, D, E, F, G and ZA are normative.
The annexes H, J and ZB are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations
of the following countries are bound to implement this European Standard: Austria, Belgium,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United
Kingdom.
Page 4
1 Scope
This standard specifies a method based on cup tests for determining the water vapour
permeance of building products and the water vapour permeability of building materials under
isothermal conditions. Different sets of test conditions are specified.
The general principles are applicable to all hygroscopic and non hygroscopic building
materials and products, including those with facings and integral skins. Annexes give details
of test methods suitable for different material types. This standard is not applicable in the
case of test specimens with water vapour diffusion-equivalent air layer thickness values less
than 0,1 m, as a result of increasing uncertainty in the measurement results. If the measured
water vapour diffusion-equivalent air layer thickness is greater than 1500 m the material can
be considered impermeable.
The results obtained by this method are suitable for design purposes, production control and
for inclusion in product specifications.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to this European standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
ISO 9346 Thermal insulation - Mass transfer - Physical quantities and definitions
Page 5
3 Definitions, symbols and units
3.1 Terms and definitions
For the purposes of this standard, the terms and definitions given in ISO 9346 and the
following apply.
3.1.1
density of water vapour flow rate
mass of water vapour transferred through the specimen per area and per time
3.1.2
homogeneous material
material with properties likely to affect the transmission of water vapour which do not vary
on a macroscopic scale
3.1.3
water vapour permeance
density of water vapour flow rate divided by the water vapour pressure difference between the
two specimen faces
3.1.4
water vapour resistance
reciprocal of water vapour permeance
3.1.5
water vapour permeability
product of the water vapour permeance and the thickness of a homogeneous specimen
NOTE Water vapour permeability can only be calculated for specimens of a
homogeneous material.
3.1.6
water vapour resistance factor
water vapour permeability of air divided by that of the material concerned
NOTE The water vapour resistance factor indicates how much greater the resistance
of the material is compared to an equally thick layer of stationary air at the same
temperature.
3.1.7
water vapour diffusion-equivalent air layer thickness
thickness of a motionless air layer which has the same water vapour resistance as the
specimen
Page 6
3.2 Symbols and units
Symbol Quantity Unit
A area of specimen m
G water vapour flow rate through specimen kg/s
R gas constant for water vapour = 462
Nm/(kgK)
v
S hydraulic diameter of specimen m
T thermodynamic temperature K
W water vapour permeance with respect to partial
kg/(m sPa)
p
vapour pressure
Z water vapour resistance with respect to partial m sPa/kg
p
vapour pressure
D mean thickness of specimen m
g density of water vapour flow rate
kg/(m s)
l diameter of circle or side of square specimen m
m mass of specimen and cup assembly kg
p barometric pressure hPa
p standard barometric pressure = 1013,25 hPa
s water vapour diffusion-equivalent air layer m
d
thickness
t time s
water vapour pressure difference across specimen Pa
p
v
water vapour permeability with respect to partial
kg/(msPa)
p
vapour pressure
water vapour permeability of air with respect to
kg/(msPa)
a
partial vapour pressure
water vapour resistance factor -
Celsius temperature
C
relative humidity -
NOTE The above units comply with ISO 9346; a conversion table to other units
commonly used in permeability measurements is given in annex J.
3.3 Subscripts
Subscript Denoting
I interval
r repeatability
aair
c corrected for air layer
f film
j joint
m membrane
me masked edge
s specimen
ttotal
Page 7
4 Principle
The test specimen is sealed to the open side of a test cup containing either a desiccant (dry
cup) or an aqueous saturated solution (wet cup). The assembly is then placed in a temperature
and humidity controlled test chamber. Because of the different partial vapour pressure
between the test cup and the chamber, a vapour flow occurs through permeable specimens.
Periodic weighings of the assembly are made to determine the rate of water vapour
transmission in the steady state.
5 Apparatus
a) Test cups resistant to corrosion from the desiccant or salt solutions they contain; typically
cups are made of glass or metal.
The design of cups suitable for testing various different types of materials is described in
annexes A to E.
NOTE Circular cups can be easier to seal and transparent cups allow better control of
salt solutions.
b) For certain cups and sealing methods (see annex A), a template, with shape and size
corresponding to that of the test cup, is used when applying the sealant to give a sharply
defined, reproducible test area. The template shall have an area of at least 90 % of the
specimen to limit non-linear vapour flow.
c) Measuring instruments capable of determining specimen thickness with accuracy required
in 7.2.
d) Analytical balance, capable of weighing the test assembly with the repeatability needed
for the required accuracy. Wherever possible a balance of 0,001 g resolution shall be
used. For heavy test assemblies a balance resolution of 0,01 g may be sufficient. See
annex H for information linking the balance resolution to the duration of test.
NOTE The factors that affect the necessary accuracy of measurement are discussed in
annex H.
e) Constant temperature, constant humidity chamber, capable of being maintained within
3 % relative humidity around the set point relative humidity and 0,5 K around the set
point temperature. In order to ensure uniform conditions throughout the chamber, the air
shall be stirred so as to obtain velocities between 0,02 m/s and 0,3 m/s. If highly
permeable materials are being tested, means should be provided to measure the air speed
directly over the upper surface of the specimen - see annex G.
f) Suitable sensors and a logging system to continuously record the temperature, relative
humidity and, if necessary, the barometric pressure within the test chamber. The sensors
shall be calibrated at regular intervals.
Page 8
g) Sealant, which is impermeable to water vapour, does not undergo physical or chemical
changes during the test and does not cause physical or chemical changes to the specimen.
NOTE Examples of sealants suitable for specific materials, if necessary, are listed in
the appropriate annex.
6 Test specimens
6.1 General principles for preparation of test specimens
The test specimens shall be representative of the product. If the product has natural skins or
integral facings, these may be included in the test specimen, but they shall be removed if it is
intended to measure the permeability of the core material. If the skins or facings are different
on the two sides, specimens shall be tested with vapour flow in the direction of the intended
use. If the direction of flow is not known, duplicate specimens shall be prepared and tests
carried out for each direction of flow. Unless the product to be tested in isotropic, the test
specimens shall be cut so that the parallel faces are normal to the direction of vapour flow of
the product in use.
Specimen preparation shall not involve methods which damage the surface in ways which
affect the flow of water vapour.
6.2 Dimensions of test specimens
6.2.1 Shape and fit
Test specimens shall be cut to correspond with the dimensions of the chosen test assembly -
see annexes A to E.
6.2.2 Exposed area
The diameter of a circular specimen or the side of a square specimen shall be at least twice the
specimen thickness. The exposed area (the arithmetic mean of the upper and lower free
surface areas) shall be at least 0,005 m . The upper and lower free surface areas shall not
differ by more than 3 % of the mean in the case of homogeneous materials, and by no more
than 10 % in the case of other materials.
6.2.3 Thickness of test specimens.
Whenever possible, the thickness of the specimen shall be that of the product in use. In the
case of homogeneous materials, if the thickness exceeds 100 mm, this may be reduced by
cutting. In the case of non homogeneous materials, such as concrete containing aggregates, the
thickness should be at least three times (and preferably five times) the largest particle size.
If a material contains macroscopic formed voids, the solid material should be tested and the
resistance of the whole mater
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