Revit’s structural features allow users to place rebars in concrete walls for reinforcement which is a great tools for various reasons. It is a typical situation to have holes/openings in the wall which interrupt the rebars in the wall since you do not want the rebars going through the opening. Depending on the method of placing the rebars, the reinforcing may or may be interrupted. It is important when rebar is interrupted at openings in order to create an accurate model.
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It is common to have openings in walls that are not of a consistent width all the way through the wall. An example of this is when a door is recessed into a brick wall and the brick opening is wider than the stud/masonry wall opening or the door. The following illustration shows a door opening in a stud and brick wall with the brick opening wider to allow brickmould casing around the door.
Revit doors and windows, by default, have an opening that goes straight through the wall with a completely rectangular opening. If you just use the default Door.rft or Window.rft with the default opening to create your doors and window families, you will not see the above jogged offset opening.
The secret to getting the walls to cut as you desire is to NOT use the Opening Cut that is in the family template, but use Voids instead.
There are times when a door (or window, opening, or door/window assembly) gets placed into a wall that has another wall (or multiple walls) adjacent to it. Even though a door can be placed in only one wall, it is possible to create an opening in the adjacent wall(s) so that when the door is relocated or changes size, the opening in the other wall(s) change accordingly.
Applying Technology to Architecture 