Menu path
Construct Roof > Gable
What it does
The Gable command creates asymmetrical gable roofs and gable projections that can be integrated into existing roofs. This is essential for complex roofing designs where standard symmetrical gables won't work.
🛠 When to use the Gable command
Use the Gable command when you need to:
Create an asymmetrical gable roof (where left and right sides have different pitch or spans)
🔧 How to construct a gable roof
Start the command: Click Construct Roof > Gable
Set the ridge start point: When prompted, click to locate the start of the ridge line, or type coordinates like 0,0 and press [Enter]
Define ridge direction and length: In the command prompt area, specify the ridge direction and length using incremental coordinates.
For example, type ix7500.00 and press [Enter] to create a ridge extending 7500mm in the X-axis from the start point
The software displays the start and finish points of the ridge line, then opens the Gable roof defaults dialog box.
🧾 Gable roof parameters
Field | Description |
Roof type | Choose the material category: Tiles, Shingle, Shake, Metal, or Low-Slope |
Storey | Set the storey level (1, 2, etc.) for easier roof separation on screen and storey-specific labour rate calculations |
Pitch left | The pitch (slope) of the left-hand roof plane, relative to standing at the ridge start point |
Pitch right | The pitch (slope) of the right-hand roof plane, relative to standing at the ridge start point |
Span left | The span (width) from the ridge to the left-hand eave |
Span right | The span (width) from the ridge to the right-hand eave |
Left eave height | The height of the left-hand eave. The right-hand eave height is automatically calculated based on the combined factors of span and pitch |
Length | The length of the ridge. Defaults to the distance you digitised when setting the ridge direction - change to the required ridge length as required |
Top View and Isometric View
🔧 Dialog box controls
Button | Function |
[Cancel] | Cancels the roof generation and closes the dialog |
[Swap Dir] | Reverses the ridge direction (swaps start and end points) |
[OK] | Generates the gable roof according to your specifications |
When you click [OK], the gable roof is drawn according to the parameters you've defined.
💡 Coordinate input tips
When specifying ridge direction and length:
Use ix prefix for incremental X-axis movement (e.g., ix7500.00)
Use iy prefix for incremental Y-axis movement
The measurement is in millimetres
This incremental method ensures precise positioning relative to your start point