Be sure you have only the building pad selected. It is possible to select the area of toposurface beneath your pad which may be confusing you. If you continue to have problems, try selecting it with a selection box and then click Modify | Multi-Select > Filter tab > Filter to isolate the pad.
~Kevin Dolley, The Revit User Experience Team
ekarlThu Oct 4, 2012 3:02 pmHow does this feature work with phasing? Topo surfaces are modified by building pads. There are many many existing sites that have some sort of "pad" on the site. It will be inevitable that many will partially remain and then have to be modified to accommodate a modified floor plan or completely new structure. This means you will have an existing pad, and a new one. Some of the existing pad may remain (very likely). So, you will have to modify the existing pad and this brings in the possibility of filling in areas that were formerly building pad. Therefore: Please implement some method of doing this without resorting to gaming REVIT to copy / paste elements of an existing pad, that has been demolished into the same location and then editing it. It doesn't work - I've tried it. THe phasing of the pasted element is wrong so REVIT thinks you are pasting a buildin pad over top of an existing one and warns that they cannot overlap. In properly phased work, the existin "remnants" would have no difficulty existing next to the missing parts and the newly connected new parts. No black holes forming or anything like that. (partical physics again)
loboarchTue Oct 9, 2012 10:47 amI understand the issue you are describing and because pads not being able to overlap, and the way graded regions (new and existing toposurfaces) work the problems creating a pad with existing and new portions can be a bit tricky. It is hard to say exactly how to solve your specific situation without seeing the particular conditions. I will pass along your request for a clearer way of working with phased pads and toposurface elements to the Revit team so it can be considered for future develpment.