Model
Last updated
Last updated
Orientation refers to the geographical direction a building or a part of the building (like a wall or window) faces. Orientation can significantly impact the amount and intensity of solar radiation a building receives, which in turn affects the thermal and moisture dynamics within the building.
Cavity ventilation rate refers to the rate at which air moves into and out of a cavity within a building structure, such as a cavity wall or a ventilated rain screen. Ventilation can help remove moisture from a cavity, reducing the risk of condensation and related problems. In hygrothermal modelling, the cavity ventilation rate is a critical factor that can affect the moisture balance in building elements.
Floor area refers to the total area of the floor of a space, measured in square meters. In hygrothermal modelling, floor area directly correlates to internal moisture loading, with larger floor areas typically having lower moisture loading than smaller areas.
This is the vertical distance from the floor to the ceiling of a room. It can influence the volume of air in a room and thus impact internal moisture loading.
In the context of hygrothermal modelling, surface resistances represent the resistance to heat and moisture transfer at the internal and external surfaces of a building element (like a wall or roof).
This group of inputs describe concepts applied to heat transfer surfaces that are of an advanced nature. Careful consideration must be given before using these. More.
The rate of convective heat transfer between the exterior surface of a building component and the surrounding air. It represents the effectiveness of heat exchange at the exterior boundary.
The convective heat transfer coefficient within a cavity space, such as within an insulated wall or roof assembly. It characterizes the rate of heat transfer through convection within the cavity.
The convective heat transfer coefficient between the interior surface of a building component and the indoor air. It reflects the efficiency of heat exchange at the interior boundary.
The rate of moisture transfer between the exterior surface of a building component and the surrounding air. It indicates the effectiveness of moisture exchange at the exterior boundary.
Paint Type
Thickness (m)
Sd Value (m)
Vapour Transmission Coefficient (kg/(m²⋅s⋅Pa))
Speckel Default
0.0002
0.032
0.0000000065
Water-based Emulsion Paint
0.0002
0.04 - 0.1
0.000000005 - 0.000000002
Acrylic Paint
0.0002
0.2 - 0.4
0.000000001 - 0.0000000005
Latex Paint
0.0002
0.08 - 0.16
0.0000000025 - 0.00000000125
Silicate Paint
0.0002
0.006 - 0.02
0.0000000333 - 0.00000001
Oil-based Paint
0.0002
0.4 - 1.0
0.0000000005 - 0.0000000002
Vapour-Barrier Paint
0.0002
2.0 - 4.0
0.0000000001 - 0.00000000005
The moisture transfer coefficient within a cavity space, such as within an insulated wall or roof assembly. It characterizes the rate of moisture transfer through the cavity.
The moisture transfer coefficient between the interior surface of a building component and the indoor air. It reflects the efficiency of moisture exchange at the interior boundary.
