https://forums.autodesk.com/t5/revit-structure-forum/populating-dimensions/m-p/5810936#M45034 <P>there is a difference between a floor slab vs a foundation slab.</P> <P>&nbsp;</P> <P>Although the element properties look the same, Revit recognizes the structural usage of a floor slab to be a "slab" and a foundation slab is recognized as a "foundation" or "slab on grade." &nbsp;This is for analytical purposes. &nbsp;Therefore, the floor slab does not contain length and width instance/reporting parameters. &nbsp;See attachments.</P> Thu, 10 Sep 2015 13:43:09 GMT dzanta 2015-09-10T13:43:09Z