NF EN ISO 13788

NF EN ISO 13788

April 2013
Standard Current

Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods

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.

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Main informations

Collections

National standards and national normative documents

Publication date

April 2013

Number of pages

51 p.

Reference

NF EN ISO 13788

ICS Codes

17.200.01   Thermodynamics in general
91.060.10   Walls. Partitions. Faþades
91.120.10   Thermal insulation of buildings

Classification index

P50-766

Print number

1 - 28/03/2013

International kinship

ISO 13788:2012

European kinship

EN ISO 13788:2012
Sumary
Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods

ISO 13788:2012 gives simplified calculation methods for:

  1. 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.
  2. 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.
  3. 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.
Replaced standards (1)
NF EN ISO 13788
December 2001
Standard Cancelled
Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods

La présente norme donne des méthodes de calcul permettant de déterminer : a) la température superficielle 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 ; b) le risque de condensation dans la masse due à la diffusion de vapeur d'eau. La méthode utilisée repose sur l'hypothèse que toute humidité incorporée a disparu et ne tient pas compte d'un certain nombre de phénomènes physiques importants, tels que : - l'influence de la teneur en humidité sur la conductivité thermique de la teneur en humidité - le dégagement et l'absorption de chaleur latente ; - la variation des propriétés de matériaux avec la teneur en humidité - la succion capillaire et le transfert d'humidité à l'état liquide dans les matériaux - les déplacements d'air par les fissures ou dans les espaces d'air - la capacité hygroscopique des matériaux. Par conséquent, cette méthode ne s'applique qu'aux structures dans lesquelles ces effets sont négligeables.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions, symboles et unités
  • 4 Données d'entrée pour les calculs
  • 5 Calcul de la température de surface pour éviter la condensation superficielle
  • 6 Calcul de la condensation dans la masse
  • 7 Calcul du séchage des différents éléments du bâtiment
  • A Conditions aux limites intérieures
  • B Exemples de calcul du facteur de température sur la surface intérieure pour éviter une humidité superficielle critique
  • C Exemples de calcul de la condensation dans la masse
  • D Exemple de calcul du potentiel de séchage d'une couche mouillée
  • E Relations régissant le transfert d'humidité et la pression de vapeur d'eau
  • Bibliographie
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