Troubleshooting Roofs

Reference Number: KB-00115
Last Modified: March 13, 2017

The information in this article applies to:

Home Designer Professional or Home Designer Architectural or Home Designer Suite or Home Designer Interiors


When I select Build> Roof> Build Roof  from the menu and click OK in the dialog, no roof is created. Why is that happening and how do I fix it?


There are several reasons why a roof might not be produced in a given plan. We will discuss the most common reasons why a roof would not be generated below including room definition, structural specifications and Roof Baseline Polylines.

To verify room definition


  • When walls are drawn to enclose an area, the program will recognize that area as a room.

  • You should be able to click in a room in floor plan view using the Select Objects  tool and select it.  The room will change in color once selected and the status bar at the lower right will show Room as the current selection.

  • If you cannot, there is probably a gap somewhere along the perimeter walls.  Carefully examine the walls, particularly the corners, and make any adjustments needed to make sure they are properly connected. 

To check structural room specifications 

  • If you are able to select the room or rooms in your plan, make sure that they are set to have roofs built over this room.

  • With the room selected, click the Open Object  edit button to display the Room Specification dialog.

  • On the Structure panel, make sure there is a check beside Roof Over This Room.

To reset the Roof Directives in Walls to match the default settings

  1. Select Edit> Reset to Defaults to bring up the Reset to Defaults dialog.

  2. Set the Reset Scope to All Floors.

  3. Place a checkmark in the boxes next to:
    Floor Heights
    Ceiling Heights
    Roof Directives in Walls 

  4. Then click on the OK button to apply the changes and restore these values back to their defaults.

To delete gable lines in Home Designer Architectural and Pro

Home Designer Architectural and Home Designer Pro have a Gable/Roof Line tool which can be used to automatically generate a gable above the bearing wall of a hip roof plane such as if a Wall Break would be required in the same location as a door or window, where a wall is not present, such as across the front of an alcove, or over a Bay, Box, or Bow Window.

If you have tried to use a Gable/Roof Line in a different area than those described above, it may be undesirable affecting the generation of the roof planes.  Using the Select Objects tool, you can select the Gable/Roof Line then Delete it.

If another object in the area select first, then use the Next edit tool, or the Tab shortcut key on your keyboard, until the Gable/Roof Line object is selected, then remove it.

To delete roof baseline polylines in Home Designer Pro 

In Home Designer Pro, an unwanted Roof Baseline Polyline may prevent the roof from generating properly.

You can quickly remove any Roof Baseline Polylines from the current plan by selecting Edit> Delete Objects  from the menu.

In the Delete Objects dialog, select All Floors, check the box beside Roof Baseline Polylines, click the Delete button, and then click OK.  Lastly, rebuild your roof.

To Reset Roof Groups in Home Designer Pro

If you have set one or more rooms to be in a Roof Group other than zero, you can use the Reset to Defaults menu option to set them all back to zero.

Select Edit> Reset to Defaults to bring up the Reset to Defaults dialog box.

Place a checkmark in the Roof Groups box and then click on the OK button to reset all the rooms to Roof Group zero.

Then select Build> Roof> Build Roof  from the menu, place a checkmark in the Build Roof Planes box, and click OK in the dialog