8.10.5.6 Pset_MaterialHygroscopic

PSET_TYPEDRIVENOVERRIDE / IfcMaterial

Material Hygroscopic: A set of hygroscopic properties of materials.

buildingSMART Data Dictionary

PSD-XML

Name	Type	Description
UpperVaporResistanceFactor	P_SINGLEVALUE / IfcPositiveRatioMeasure	Upper Vapor Resistance Factor The vapor permeability relationship of air/material (typically value > 1), measured in high relative humidity (typically in 95/50 % RH).
LowerVaporResistanceFactor	P_SINGLEVALUE / IfcPositiveRatioMeasure	Lower Vapor Resistance Factor The vapor permeability relationship of air/material (typically value > 1), measured in low relative humidity (typically in 0/50 % RH).
IsothermalMoistureCapacity	P_SINGLEVALUE / IfcIsothermalMoistureCapacityMeasure	Isothermal Moisture Capacity Based on water vapor density.
VaporPermeability	P_SINGLEVALUE / IfcVaporPermeabilityMeasure	Vapor Permeability The rate of water vapor transmission per unit area per unit of vapor pressure differential under test conditions.
MoistureDiffusivity	P_SINGLEVALUE / IfcMoistureDiffusivityMeasure	Moisture Diffusivity Moisture diffusivity is a transport property that is frequently used in the hygrothermal analysis of building envelope components.

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