Construction tab in model data under Construction header
Sub-surfaces are used to define areas of a surface having a different construction to that of the main surface construction. Typical examples include cold-bridging elements such as window lintels and opaque panels in a lightweight façade. You can define different sub-surface construction types for external walls, internal partitions and pitched roofs. This makes it easier to set up defaults at building, block or zone level.
Sub-surfaces are modelled in the same detail as standard surfaces including the effect of thermal mass but not including any 2-D or 3-D heat conduction effects due to the interface between the sub-surface and the background parent surface.
To add a sub-surface, go to the surface you wish to work on, click on the Layout tab and select the Draw sub-surface command.
You can also define default constructions for doors.
The sub-surface constructions defined here are applied to sub-surfaces placed on the various base surface types as follows.
Any sub-surfaces created in a wall or ground floor will have this construction.
Any sub-surfaces created in any inside surface (partitions, internal floor etc) will have this construction.
Any sub-surfaces created in any pitched or flat roof will have this construction.
Defines the construction of external doors.
Defines the construction of internal doors.