8.10.4.6 Pset_MaterialHygroscopic

8.10.4.6.1 Semantic definition

A set of hygroscopic properties of materials.

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

Table 8.10.4.6.A