Revit does not have a simple solution to calculate formwork Areas. The solution to schedule the formwork areas of each INSITU elements was to use Dynamo. The node does not take into account joint faces, only elements as a whole. The shared parameter for the top, bottom and side formwork area updated.
Example of the formwork areas
Link to Download the above Graph.
FORMWORK AREA – NODE
A custom node that split the surface based on the vector direction Z value relative to the surface. The result, the top, bottom and side area values are filtered to each.