The various Autodesk Revit products have the Demolish tool function that designates an element as being demolished for phasing, display, and analysis purposes, and also shows the element as dashed linework. Suspended acoustical ceilings (ACT) with gridwork are a bit of an exception as the grid does not show as dashed when the ceiling is designated as demolished. In this article, we will look at how to get the grid lines of the ceiling to display as dashed when it is demolished. 
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Applying Technology to Architecture 