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ISO 21129:2007Published

Hygrothermal performance of building materials and products — Determination of water-vapour transmission properties — Box method

Performance hydrothermique des matériaux et produits pour le bâtiment — Détermination des propriétés de transmission de la vapeur d'eau — Méthode de box

Abstract / scope

ISO 21129:2007 specifies a box method for determining the water-vapour permeability of building materials. The box method is used primarily to measure the water-vapour permeance of materials that have low water-vapour resistance, in which the influence of the surface-humidity transmission-resistance cannot be ignored.