Menu path
Modify Roof > Valley/Hip Gable
🧾 What it does
This command inserts a gable at the base of a valley or hip line. In effect, it automatically connects a gable dormer into the corner of a roof. You may also create flat roof plane areas up to the apex of a roof.
🔧 How to use it
Select the Valley/Hip Gable command from the Modify Roof menu
Click to select a valley line or hip line on your roof
The system checks if the base of the valley/hip connects to 2 eave lines. If not, the command terminates with an error message
Configure your settings in the Valley Gable Defaults dialog box that appears
Click OK to apply the gable insertion
Selecting a hip:
Selecting a valley:
🧾 Hip/Valley Gable Defaults settings
Setting | Description |
Distance along each eave | The distance along each eave line that defines the width of the gable |
Pitch | The pitch angle of the two gable planes |
Extension | The straight-line distance from the intersection with the eave to the actual gable position |
🔧 Advanced options
Click the Gable button in the dialog to access additional options:
Flat plane to apex: Generate a flat plane across the hip all the way up to the ridge apex (pitch determined automatically by geometry)
Known pitch: Insert the flat plane at a specific pitch angle you define (e.g., 15° or 25° on storey 1)
Hip line selection: Creates a gable insertion at the base of the hip, modifying adjacent planes accordingly.
Insertion of [Flat Plane] to hip line stretched to apex or known pitch:
Valley line selection: Creates a gable insertion at the base of the valley, with similar geometric modifications.
No extension: When extension is set to zero, the gable connects directly at the eave intersection point.
💡 Tips
Ensure your valley or hip line connects to exactly two eave lines before starting
Use the extension value to control how far the gable projects from the main roof structure
The flat plane option is useful for creating modern architectural features or transitions between roof levels
⚠️ Important notes
The command will only work if the selected valley/hip base connects to exactly 2 eave lines
All adjacent roof planes are automatically recalculated to maintain proper geometry