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.
Status: PublishedPublication date: 2007-07
Edition: 1Number of pages: 11
Technical Committee: ISO/TC 163/SC 1 Test and measurement methods
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