NA 005

DIN Standards Committee Building and Civil Engineering

Standards [CURRENT]

DIN EN ISO 13788
Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods (ISO 13788:2012); German version EN ISO 13788:2012

Title (German)

Wärme- und feuchtetechnisches Verhalten von Bauteilen und Bauelementen - Raumseitige Oberflächentemperatur zur Vermeidung kritischer Oberflächenfeuchte und Tauwasserbildung im Bauteilinneren - Berechnungsverfahren (ISO 13788:2012); Deutsche Fassung EN ISO 13788:2012


This standard gives simplified calculation methods for: a) 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. b) for the purpose of 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 depending on 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. Consequently, the method is applicable only where the effects of these phenomena can be considered to be negligible. c) 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. The committee responsible for this standard is NA 005-56-99 AA "Feuchte (SpA zu CEN/TC 89/WG 10, ISO/TC 163/SC 1/WG 8)" ("Moisture (national mirror committee for CEN/TC 89/WG 10, ISO/TC 163/SC 1/WG 8)") at DIN.

Document: references other documents

Document: referenced in other documents

Responsible national committee

NA 005-56-99 AA - Moisture (national mirror committee for CEN/TC 89/WG 10, ISO/TC 163/SC 1/WG 8, ISO/TC 163/SC 2/WG 16)  

Responsible european committee

CEN/TC 89 - Thermal performance of buildings and building components  

Responsible international committee

ISO/TC 163/SC 2 - Calculation methods  

Edition 2013-05
Original language German
Translation English
Price from 129.30 €
Table of contents


M. Eng.

Bettina Müller

Am DIN-Platz, Burggrafenstr. 6
10787 Berlin

Tel.: +49 30 2601-2541
Fax: +49 30 2601-42541

Send message to contact