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ISO 21129:2007

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

General information
Valid from 04.07.2007
Directives or regulations
None

Standard history

Status
Date
Type
Name
04.07.2007
Main
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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