EN ISO 12572:2016

European foreword
Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and subscripts
4 Principle
5 Apparatus
6 Test specimens
7 Procedure
8 Calculation and expression of results
9 Accuracy of measurement
10 Test report
Annex A (normative) - Methods suitable for self-supporting
        materials
Annex B (normative) - Methods suitable for loose fills
Annex C (normative) - Methods suitable for membranes and
        foils
Annex D (normative) - Methods suitable for mastics and
        sealants
Annex E (normative) - Methods suitable for paint, varnishes, etc
Annex F (normative) - Correction for the effect of a masked
        edge of a specimen
Annex G (normative) - Correction for resistance of air layers
Annex H (normative) - Method for calculating the water vapour
        resistance of the air layer in the cup
Annex I (informative) - Weighing repeatability, weighing interval
        and specimen size needed to achieve desired accuracy
Annex J (informative) - Conversion table for water vapour
        transmission units
Bibliography

ISO 12572:2016 specifies a method based on cup tests for determining the water vapour permeance of building products and the water vapour permeability of building materials under isothermal conditions. Different sets of test conditions are specified.The general principles are applicable to all hygroscopic and non-hygroscopic building materials and products, including insulation materials and including those with facings and integral skins. Annexes give details of test methods suitable for different material types.The results obtained by this method are suitable for design purposes, production control and for inclusion in product specifications.