ISO 13788:2012
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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Section sec_1
Section sec_2
Section sec_3
Section sec_3.1
Section sec_3.2
Section sec_3.3
Section sec_4
Section sec_4.1
Table tab_1
Section sec_4.2
Section sec_4.2.1
Section sec_4.2.2
Section sec_4.2.3
Section sec_4.2.4
Section sec_4.2.4.1
Section sec_4.2.4.2
Section sec_4.3
Section sec_4.3.1
Section sec_4.3.2
Section sec_4.4
Section sec_4.4.1
Table tab_2
Section sec_4.4.2
Section sec_5
Section sec_5.1
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.4.1
Section sec_6.4.2
Section sec_6.4.3
Section sec_6.4.4
Figure fig_1
Section sec_6.4.5
Figure fig_2
Figure fig_3
Section sec_6.4.6
Figure fig_4
Section sec_6.4.7
Figure fig_5
Figure fig_6
Section sec_6.4.8
Figure fig_7
Section sec_6.5
Section sec_7
Section sec_7.1
Section sec_7.2
Section sec_7.3
Section sec_7.4
Annex sec_A
Annex sec_A.1
Table tab_c
Figure fig_A.1
Annex sec_A.2
Table tab_A.1
Table tab_d
Figure fig_A.2
Annex sec_B
Annex sec_B.1
Table tab_B.1
Annex sec_B.2
Table tab_B.2
Annex sec_B.3
Table tab_B.3
Annex sec_B.4
Table tab_B.4
Annex sec_C
Annex sec_C.1
Table tab_C.1
Annex sec_C.2
Table tab_e
Figure fig_C.1
Table tab_C.2
Table tab_C.3
Annex sec_C.3
Table tab_f
Figure fig_C.2
Table tab_C.4
Table tab_C.5
Annex sec_C.4
Table tab_g
Figure fig_C.3
Table tab_C.6
Annex sec_C.5
Table tab_h
Figure fig_C.4
Table tab_C.7
Table tab_C.8
Table tab_C.9
Annex sec_C.6
Table tab_C.10
Table tab_i
Figure fig_C.5
Table tab_C.11
Table tab_C.12
Annex sec_D
Table tab_j
Figure fig_D.1
Table tab_D.1
Table tab_D.2
Table tab_k
Figure fig_D.2
Annex sec_E
Annex sec_E.1
Table tab_E.1
Annex sec_E.2
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Bibliography
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions, symbols and units
3.1 Terms and definitions
3.2 Symbols and units
3.3 Subscripts
4 Input data for the calculations
4.1 Material and product properties
4.2 External boundary conditions
4.3 Internal boundary conditions
4.4 Surface resistances
5 Calculation of surface temperature to avoid critical surface humidity
5.1 General
5.2 Determining parameters
5.3 Design for avoidance of mould growth, corrosion or other moisture damage
5.4 Design for the limitation of surface condensation on low thermal inertia elements
6 Calculation of interstitial condensation
6.1 General
6.2 Principle
6.3 Limitation of sources of error
6.4 Calculation
6.5 Criteria used to assess building components
7 Calculation of drying of building components
7.1 General
7.2 Principle
7.3 Specification of the method
7.4 Criteria used to assess drying potential of building components
Annex A (informative) Internal boundary conditions
Annex B (informative) Examples of calculation of the temperature factor at the internal surface to avoid critical surface humidity
Annex C (informative) Examples of calculation of interstitial condensation
Annex D (informative) Example of the calculation of the drying of a wetted layer
Annex E (informative) Relationships governing moisture transfer and water vapour pressure
Bibliography
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Section sec_1
Section sec_2
Section sec_3
Section sec_3.1
Section sec_3.2
Section sec_3.3
Section sec_4
Section sec_4.1
Table tab_1
Section sec_4.2
Section sec_4.2.1
Section sec_4.2.2
Section sec_4.2.3
Section sec_4.2.4
Section sec_4.2.4.1
Section sec_4.2.4.2
Section sec_4.3
Section sec_4.3.1
Section sec_4.3.2
Section sec_4.4
Section sec_4.4.1
Table tab_2
Section sec_4.4.2
Section sec_5
Section sec_5.1
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.4.1
Section sec_6.4.2
Section sec_6.4.3
Section sec_6.4.4
Figure fig_1
Section sec_6.4.5
Figure fig_2
Figure fig_3
Section sec_6.4.6
Figure fig_4
Section sec_6.4.7
Figure fig_5
Figure fig_6
Section sec_6.4.8
Figure fig_7
Section sec_6.5
Section sec_7
Section sec_7.1
Section sec_7.2
Section sec_7.3
Section sec_7.4
Annex sec_A
Annex sec_A.1
Table tab_c
Figure fig_A.1
Annex sec_A.2
Table tab_A.1
Table tab_d
Figure fig_A.2
Annex sec_B
Annex sec_B.1
Table tab_B.1
Annex sec_B.2
Table tab_B.2
Annex sec_B.3
Table tab_B.3
Annex sec_B.4
Table tab_B.4
Annex sec_C
Annex sec_C.1
Table tab_C.1
Annex sec_C.2
Table tab_e
Figure fig_C.1
Table tab_C.2
Table tab_C.3
Annex sec_C.3
Table tab_f
Figure fig_C.2
Table tab_C.4
Table tab_C.5
Annex sec_C.4
Table tab_g
Figure fig_C.3
Table tab_C.6
Annex sec_C.5
Table tab_h
Figure fig_C.4
Table tab_C.7
Table tab_C.8
Table tab_C.9
Annex sec_C.6
Table tab_C.10
Table tab_i
Figure fig_C.5
Table tab_C.11
Table tab_C.12
Annex sec_D
Table tab_j
Figure fig_D.1
Table tab_D.1
Table tab_D.2
Table tab_k
Figure fig_D.2
Annex sec_E
Annex sec_E.1
Table tab_E.1
Annex sec_E.2
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Bibliography
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions, symbols and units
3.1 Terms and definitions
3.2 Symbols and units
3.3 Subscripts
4 Input data for the calculations
4.1 Material and product properties
4.2 External boundary conditions
4.3 Internal boundary conditions
4.4 Surface resistances
5 Calculation of surface temperature to avoid critical surface humidity
5.1 General
5.2 Determining parameters
5.3 Design for avoidance of mould growth, corrosion or other moisture damage
5.4 Design for the limitation of surface condensation on low thermal inertia elements
6 Calculation of interstitial condensation
6.1 General
6.2 Principle
6.3 Limitation of sources of error
6.4 Calculation
6.5 Criteria used to assess building components
7 Calculation of drying of building components
7.1 General
7.2 Principle
7.3 Specification of the method
7.4 Criteria used to assess drying potential of building components
Annex A (informative) Internal boundary conditions
Annex B (informative) Examples of calculation of the temperature factor at the internal surface to avoid critical surface humidity
Annex C (informative) Examples of calculation of interstitial condensation
Annex D (informative) Example of the calculation of the drying of a wetted layer
Annex E (informative) Relationships governing moisture transfer and water vapour pressure
Bibliography