GSO ISO 21129:2013
ISO 21129:2007
Gulf Standard
Current Edition
·
Approved on
09 September 2013
Hygrothermal performance of building materials and products -- Determination of water-vapour transmission properties -- Box method
GSO ISO 21129:2013 Files
English
11 Pages
Current Edition
Reference Language
USD
80.72
GSO ISO 21129:2013 Scope
This International Standard 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.
NOTE Materials with low water-vapour resistance includes those with no greater than 1,8 × 109 · m2 · s · Pa/kg of resistance [water vapour permeability coefficient of 5,5 × 10−8kg/(m2 · s · Pa or above)].
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