Name | Type | Description |
UpperVaporResistanceFactor |
P_SINGLEVALUE / IfcPositiveRatioMeasure |
![](http://www.vfkjsd.cn/ifc/ifc4/img/locale-en.png) |
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 |
![](http://www.vfkjsd.cn/ifc/ifc4/img/locale-en.png) |
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 |
![](http://www.vfkjsd.cn/ifc/ifc4/img/locale-en.png) |
Isothermal Moisture Capacity |
Based on water vapor density. |
|
VaporPermeability |
P_SINGLEVALUE / IfcVaporPermeabilityMeasure |
![](http://www.vfkjsd.cn/ifc/ifc4/img/locale-en.png) |
Vapor Permeability |
The rate of water vapor transmission per unit area per unit of vapor pressure differential under test conditions. |
|
MoistureDiffusivity |
P_SINGLEVALUE / IfcMoistureDiffusivityMeasure |
![](http://www.vfkjsd.cn/ifc/ifc4/img/locale-en.png) |
Moisture Diffusivity |
Moisture diffusivity is a transport property that is frequently used in the hygrothermal analysis of building envelope components. |
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