Sorry I didn't see this sooner.  I had same needs and came up with "Unit Roofs". These are symbols, one for each type of roof I needed.  The symbols measure 1'x1'x1'.  The insertion point can be a corner or center or center of an edge - depends on how you like to work.   EG for a massing model of a simple 25'x30' building and 8' tall gables: •Draw/extrude the building footprint up to height •Place a Gable Roof symbol (or copy paste an existing one), place it at a corner (depe