Modifying a Roof Baseline

Reference Number: KB-00544 Last Updated: 10-02-2013 01:50 PM

The information in this article applies to:

Home Designer Professional cover


I am working to create a roof for my structure and, in the Roof Plane Specification dialog, I see an entry for Base Line. What is a roof Base Line and how do alter it?


First, lets define the term Roof Baseline.

A roof section's baseline is the line in 3D space around which the roof section pivots as you alter the roof section's pitch. Drawn over the exterior surface of a wall's main layer, the baseline may also be drawn over a CAD line or at the corner or edge of an existing roof section.

A roof baseline, then, is the uppermost portion of a roof plane directly above the main layer of your wall. Baseline height does not include the roofing material or ­sheathing, just the framing materials.

If, for example, you were looking at a ­truss or ­rafter, the baseline would be on the top of the rafter or truss. The baseline would be located at the point where the truss or rafter sits directly above the main layer of the wall the roof plane is resting on.

To hide or modify roof baselines

  1. From the menu select Tools> Display Settings> Display Options . This will present a Layer Display Options dialog.

  2. Go to the Roofs, Baseline Polylines layer and click to highlight it. 

  3. You can select not to display this layer by unchecking the Disp column for this layer.


  4. Alternatively, you can change the Color of this layer to more easily distinguish your roof baselines from other architectural objects and CAD lines in your drawing. 

  5. At the bottom of the Layer Display Options dialog, notice that once you have selected this layer, you have the Properties for "Roofs, Baseline Polylines" displayed.  Click on the Color option to change its color.

  6. When finished making your changes, click the OK button to apply these changes and exit the Layer Display options dialog.