Sizing Walls

[aadamsA2F2Z]

Hello All, 

I had modeled my design in autocad before I started designing it in revit. I had all the dimensions perfect in autocad.  I am teaching myself revit and started doing the floorplan using the wall function in revit. After I have spent over 50 hours on this trying to figure out all of revits functions, I realized that the dimesioning does not work the same as auotcad, so now all of my overall dimensions are off. For example, I wanted a wall to be exactly 15' 4" from the outside of the building, since I am using 8" masonry in revit changes the dimension to 16'-8 1/4". This is so frustrating because now my building does not fit into my property lines, any advice on what I am doing wrong? 

I have determined that it is because it measures from the centerline, so any advice on how to account for this or change the setting? 

Even in this picture, I made this wall 15'4 and it changed it to 15'-11 3/8

[barthbradley]

I think where you are getting confused is when Walls automatically join.  If you want a 15'-4" Wall to remain 15'-4" in Length then disallow auto-joining and use the Join Geometry tool to join walls instead -- that is, if you want to remove the visible or overlapping linework between walls.   

FWIW: You can insert your DWG into Revit and trace over your DWG's walls with Revit Walls using the Pick Lines tool.