Sub-Surface Constructions

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 fa├žade. 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.

Walls

Any sub-surfaces created in a wall or ground floor will have this construction.

Internal

Any sub-surfaces created in any inside surface (partitions, internal floor etc) will have this construction.

Note: You can set Internal sub-surface defaults at building, block and surface levels. The Internal sub-surface option is not available at zone level to avoid possible ambiguity with sub-surfaces placed on internal walls between 2 different zones which could otherwise potentially have different settings.

Roof

Any sub-surfaces created in any pitched or flat roof will have this construction.

External door

Defines the construction of external doors.

Internal door

Defines the construction of internal doors.

Note: You can set Internal door defaults at building, block and surface levels. The Internal door option is not available at zone level to avoid possible ambiguity with doors placed on internal walls between 2 different zones which could otherwise potentially have different settings.