SLOPE ARROW TAIL THAT DOES NOT HAVE TO BE ON THE ROOF BOUNDARY

[anielson]

Especially in commercial/steel building applications, the roof slope is often defined by top of steel elevation at exterior grid lines. But the roof boundary line is not on the grids. This makes using slope arrows annoying because one side of the slope arrow (the point, or head) can be on the grid line, but the other side has to be on a roof edge. So you have to do math, as well as update that elevation if the overhang width changes. Can't we "lock" the tail of the arrow to a grid instead? Why is Revit limiting us here?

[Ric_Weber]

Actually you can do this, you just need to put the slope arrow line on the edge of the boundary.  So the slope arrow lies entirely along one the edges.  Hope that's making sense the way I'm saying it.  

So for instance in your image 124415, just slide the entire arrow line and all down to the south/bottom border of the roof or floor.