This is a template attribute. Template attributes can be used in filtering, or to retrieve data from the model to use in drawings and reports. For example, when you create a report, Tekla Structures replaces the attributes added in the report template with the corresponding object property values.

This custom template attribute sums up net weights of all cast unit and sub-assembly parts and surface treatments, but ignores all sub-assemblies whose main part's MATERIAL_TYPE is STEEL.

The same weight is wanted to be reported

1. early in the project when only sample elements are detailed but the great majority of the elements is not
2. in the final stage of the project when all elements have been fully detailed

The CAST_UNIT.WEIGHT attribute also takes into account the weight of all embedded sub-assemblies, such as lifting anchors and cable loops. This is not wanted as the reinforcement and embed weights are already included into a little bit exaggerated concrete density.

For cast units with dense reinforcement, the CUSTOM.ELEMENT_WEIGHT.REINFORCED attribute is more accurate than CUSTOM.ELEMENT_WEIGHT.

You can also use the CUSTOM.ELEMENT_WEIGHT.DETERMINING attribute. It shows the value of CUSTOM.ELEMENT_WEIGHT or CUSTOM.ELEMENT_WEIGHT.REINFORCED, whichever has the higher value.