ISO 21129:2007

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

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.

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