BS EN ISO 12572:2001

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

Provides 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.