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Water vapor transmission properties of building materials play an important role in the overall moisture management and durability of the exterior building envelopes. The cup method, as described in the ASTM Standard Test Methods for Water Vapor Transmission of Materials (E 96), is widely used in North America and other parts of the world for this purpose. Recently the latest ASTM standard (E 96/E 96M -05) has started taking into account various corrections (e.g. buoyancy correction, correctiondoi:10.1520/jai100621 fatcat:tgdypyfzebcu3fcgn4ozb2rftm