EN ISO 13788:2012
(Main)Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods (ISO 13788:2012, Corrected version 2020-05)
Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods (ISO 13788:2012, Corrected version 2020-05)
ISO 13788:2012 gives simplified calculation methods for:
The internal surface temperature of a building component or building element below which mould growth is likely, given the internal temperature and relative humidity. The method can also be used to assess the risk of other internal surface condensation problems.
The assessment of the risk of interstitial condensation due to water vapour diffusion. The method used does not take account of a number of important physical phenomena including the variation of material properties with moisture content; capillary suction and liquid moisture transfer within materials; air movement from within the building into the component through gaps or within air spaces; the hygroscopic moisture capacity of materials.
The time taken for water, from any source, in a layer between two high vapour resistance layers to dry out and the risk of interstitial condensation occurring elsewhere in the component during the drying process.
Wärme- und feuchtetechnisches Verhalten von Bauteilen und Bauelementen - Raumseitige Oberflächentemperatur zur Vermeidung kritischer Oberflächenfeuchte und Tauwasserbildung im Bauteilinneren - Berechnungsverfahren (ISO 13788:2012, korrigierte Fassung 2020-05)
Diese Norm gibt vereinfachte Verfahren an zur Berechnung
a) der raumseitigen Oberflächentemperatur von Bauteilen oder Bauelementen, unterhalb der bei der
gegebenen Innentemperatur und relativen Luftfeuchte ein Befall durch Schimmel wahrscheinlich ist —
das Verfahren kann auch eingesetzt werden um das Risiko dafür zu beurteilen, dass weitere Probleme im
Zusammenhang mit der Tauwasserbildung auf der raumseitigen Oberfläche auftreten können.
b) zum Zwecke der Beurteilung des Risikos der Tauwasserbildung im Bauteilinneren infolge von
Wasserdampfdiffusion. Bei dem angewendeten Verfahren wird eine Reihe wichtiger physikalischer
Phänomene, einschließlich der folgenden nicht berücksichtigt:
Schwankungen der Materialeigenschaften in Abhängigkeit vom Feuchtegehalt;
kapillare Saugwirkung und Transport von Feuchte in der flüssigen Phase in Baustoffen;
Luftbewegung aus dem Gebäudeinneren in das Bauteil durch Spalte oder in Lufträumen;
hygroskopisches Verhalten von Baustoffen.
Folglich gilt das Verfahren nur, wenn die Wirkung dieser Phänomene vernachlässigbar ist.
c) der Zeit, die in einer Schicht zwischen zwei Schichten mit hohem Wasserdampf-Diffusionsdurchlasswiderstand
befindliches und aus einer beliebigen Quelle stammendes Wasser zum Trocknen benötigt,
sowie des Risikos der Tauwasserbildung an anderer Stelle im Inneren des Bauteils während des
Trocknungsvorgangs.
Performance hygrothermique des composants et parois de bâtiments - Température superficielle intérieure permettant d'éviter l'humidité superficielle critique et la condensation dans la masse - Méthodes de calcul (ISO 13788:2012, Version corrigée 2020-05)
L'ISO 13788:2012 donne des méthodes de calcul simplifié permettant de déterminer:
1. La température de surface intérieure minimale d'un composant ou d'une paroi de bâtiment nécessaire pour rendre improbable le développement de moisissures, compte tenu de la température et de l'humidité relative intérieures. Cette méthode peut également être utilisée pour évaluer le risque d'autres problèmes de condensation superficielle intérieure.
2. Le risque de condensation dans la masse dû à la diffusion de vapeur d'eau. La méthode utilisée ne tient pas compte d'un certain nombre de phénomènes physiques importants, parmis lesquels la variation des propriétés de matériaux avec la teneur en humidité; l'absorption capillaire et le transfert d'humidité à l'état liquide dans les matériaux; la perméabilité à l'air des parois via des espaces ou des lames d'air; la capacité hygroscopique des matériaux.
3. Le temps mis par l'eau, provenant de toute source, se trouvant dans une couche située entre deux couches de forte résistance à la vapeur, pour sécher, et le risque de condensation dans la masse survenant ailleurs dans le composant au cours du processus de séchage.
Higrotermalno obnašanje sestavnih delov stavb in elementov stavb - Notranja površinska temperatura za preprečevanje kritične vlage na površini konstrukcije in kondenzacije v konstrukciji - Računska metoda (ISO 13788:2012)
Ta mednarodni standard določa poenostavljene računske metode za: a) Notranjo površinsko temperaturo sestavnega dela stavbe ali elementa stavbe, pod katerim je verjetna rast plesni zaradi notranje temperature in relativne vlažnosti. Metoda se lahko uporabi tudi za oceno tveganja težav v zvezi s kondenzacijo na drugih notranjih površinah. b) Oceno tveganja kondenzacije v konstrukciji zaradi difuzije vodne pare. Uporabljena metoda ne upošteva številnih pomembnih fizikalnih pojavov, med katerimi so: – raznolikost lastnosti materiala z vsebnostjo vlage; – kapilarno vsesavanje in prenos tekoče vlage v materialih; – premikanje zraka iz notranjosti stavbe v sestavni del skozi luknje ali v zračnih prostorih; – kapaciteta materialov za higroskopsko vlago. Posledično se metoda uporablja samo takrat, ko so učinki navedenih pojavov lahko zanemarljivi. c) Čas, ki je potreben, da se voda iz katerega koli vira v plasti med dvema plastema z visoko upornostjo vodni pari posuši, in tveganje za nastanek kondenzacije v konstrukciji kjer koli drugje v sestavnem delu med postopkom sušenja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2013
+LJURWHUPDOQRREQDãDQMHVHVWDYQLKGHORYVWDYELQHOHPHQWRYVWDYE1RWUDQMD
SRYUãLQVNDWHPSHUDWXUD]DSUHSUHþHYDQMHNULWLþQHYODJHQDSRYUãLQLNRQVWUXNFLMHLQ
NRQGHQ]DFLMHYNRQVWUXNFLML5DþXQVNDPHWRGD ,62
Hygrothermal performance of building components and building elements - Internal
surface temperature to avoid critical surface humidity and interstitial condensation -
Calculation methods (ISO 13788:2012)
Wärme- und feuchtetechnisches Verhalten von Bauteilen und Bauelementen -
Raumseitige Oberflächentemperatur zur Vermeidung kritischer Oberflächenfeuchte und
Tauwasserbildung im Bauteilinneren - Berechnungsverfahren (ISO 13788:2012)
Performance hygrothermique des composants et parois de bâtiments - Température
superficielle intérieure permettant d'éviter l'humidité superficielle critique et la
condensation dans la masse - Méthodes de calcul (ISO 13788:2012)
Ta slovenski standard je istoveten z: EN ISO 13788:2012
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
91.120.30 =DãþLWDSUHGYODJR Waterproofing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 13788
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2012
ICS 91.060.01; 91.120.10 Supersedes EN ISO 13788:2001
English Version
Hygrothermal performance of building components and building
elements - Internal surface temperature to avoid critical surface
humidity and interstitial condensation - Calculation methods
(ISO 13788:2012)
Performance hygrothermique des composants et parois de Wärme- und feuchtetechnisches Verhalten von Bauteilen
bâtiments - Température superficielle intérieure permettant und Bauelementen - Raumseitige Oberflächentemperatur
d'éviter l'humidité superficielle critique et la condensation zur Vermeidung kritischer Oberflächenfeuchte und
dans la masse - Méthodes de calcul (ISO 13788:2012) Tauwasserbildung im Bauteilinneren -
Berechnungsverfahren (ISO 13788:2012)
This European Standard was approved by CEN on 28 December 2012.
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 CEN-CENELEC 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 CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13788:2012: E
worldwide for CEN national Members.
Contents Page
Foreword . 3
Foreword
This document (EN ISO 13788:2012) has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment" in collaboration with Technical Committee CEN/TC 89
“Thermal performance of buildings and building components” the secretariat of which is held by SIS.
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 June 2013, and conflicting national standards shall be withdrawn at
the latest by June 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 13788:2001.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 13788:2012 has been approved by CEN as a EN ISO 13788:2012 without any modification.
INTERNATIONAL ISO
STANDARD 13788
Second edition
2012-12-15
Hygrothermal performance of
building components and building
elements — Internal surface
temperature to avoid critical
surface humidity and interstitial
condensation — Calculation methods
Performance hygrothermique des composants et parois de
bâtiments — Température superficielle intérieure permettant d’éviter
l’humidité superficielle critique et la condensation dans la masse —
Méthodes de calcul
Reference number
ISO 13788:2012(E)
©
ISO 2012
ISO 13788:2012(E)
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the
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ii © ISO 2012 – All rights reserved
ISO 13788:2012(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions, symbols and units . 1
3.1 Terms and definitions . 1
3.2 Symbols and units . 3
3.3 Subscripts . 4
4 Input data for the calculations . 4
4.1 Material and product properties . 4
4.2 External boundary conditions . 4
4.3 Internal boundary conditions . 6
4.4 Surface resistances . 6
5 Calculation of surface temperature to avoid critical surface humidity .7
5.1 General . 7
5.2 Determining parameters . 7
5.3 Design for avoidance of mould growth, corrosion or other moisture damage. 7
5.4 Design for the limitation of surface condensation on low thermal inertia elements . 8
6 Calculation of interstitial condensation . 9
6.1 General . 9
6.2 Principle . 9
6.3 Limitation of sources of error .10
6.4 Calculation .10
6.5 Criteria used to assess building components .16
7 Calculation of drying of building components .16
7.1 General .16
7.2 Principle .17
7.3 Specification of the method .17
7.4 Criteria used to assess drying potential of building components .17
Annex A (informative) Internal boundary conditions .18
Annex B (informative) Examples of calculation of the temperature factor at the internal surface to
avoid critical surface humidity .20
Annex C (informative) Examples of calculation of interstitial condensation .24
Annex D (informative) Example of the calculation of the drying of a wetted layer .34
Annex E (informative) Relationships governing moisture transfer and water vapour pressure .37
Bibliography .40
ISO 13788:2012(E)
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
...
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