Will go with it.
Revit roof reference plane.
In the drawing area sketch.
Revit places a reference plane at the specified offset.
Reference planes add a reference plane use the line tool or the pick line tool to draw a reference plane.
Sketch the profile of the roof as an open loop.
Now the trick is select and name the ref.
In revit reference planes can be used for two main purposes.
Click modify to end the line.
Click architecture tab work plane panel ref plane.
Usually when i create a model in revit not necessarily a family i use reference planes as guides to constrain all other elements on them.
Hide the reference plane in the view hide a selected reference plane or all reference planes in.
Used in this way they are acting as simple construction lines.
Name reference planes name each reference plane so you can assign it to be the current work plane.
For example i may lay out the perimeter of my building and then align and lock walls floors ceilings and roofs even area boundaries on those reference planes.
In the drawing area draw the reference planes by dragging the cursor.
To pick an existing line.
Simply they can be used to form a draft outline of where you need to position certain elements.
Alternatively they can actually be used to control the formation and position of 3d geometry.
On the draw panel click pick lines.
Plane if you don t none of this works.
First of all create a reference plane in desired position and if you like lock it to the roof plane this way if you raise the roof the purlins etc.
In the drawing area select the arc line.
Align roof ridges in a plan view add a reference plane.
If you specify zero segments the default a.
On the properties palette specify a value for number of full segments.
In the drawing area sketch a reference plane that is not perpendicular to the roof ridges.