SS-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)

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This International 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) 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.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.

To find similar documents by classification:

91.060 (Elements of buildings Foundations, see 93.020)

91.060.01 (Elements of buildings in general)

91.120.10 (Thermal insulation of buildings Thermal insulation in general, see 27.220 Thermal insulating materials, see 91.100.60)

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Designation Name

SS-EN ISO 13788:2013

Revision Level




Publication Date

Jan. 22, 2013



Page Count


International Equivalent

EN ISO 13788:2012(IDT); ISO 13788:2012(IDT)