Properties related to moisture vapor transmission rate through membrane are important in many branches also in building constructions. This article deals with comparison two methods of measurement water vapour diffusion flow through nanofiber textiles. One of the parameters for comparison of different sheet materials for its ability to brake the water vapour is an equivalent air layer thickness value Sd. The equivalent air layer thickness Sd [m] expresses the thickness of the air layer, which would have the same diffusion resistance as the measured material in certain thickness. It is necessary to choose the appropriate measurement method for determining the value Sd with diffusion open materials such as nanofiber materials. This article compares the outcomes of two measurement methods – Dry Cup Method according to EN ISO 12 572 and Tube Method. The measurements were carried out on a sample from nanofiber textiles based on PUR.Keywords: nanofiber textiles, moisture vapor transmission rate, PUR, dry cup method
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