Name | Type | Description |
UpperVaporResistanceFactor |
P_SINGLEVALUE
/
IfcPositiveRatioMeasure
|
![](../../../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
|
![](../../../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
|
![](../../../img/locale-en.png) | Isothermal Moisture Capacity | Based on water vapor density. |
|
VaporPermeability |
P_SINGLEVALUE
/
IfcVaporPermeabilityMeasure
|
![](../../../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
|
![](../../../img/locale-en.png) | Moisture Diffusivity | Moisture diffusivity is a transport property that is frequently used in the hygrothermal analysis of building envelope components. |
|