Menu path
Modify Roof > Attach-Planes (Pulldown Menu)
🧾 What it does
The Attach-Planes command allows you to attach a new roof plane to an existing roof plane. The new roof plane may have a different pitch and eave height than the original plane.
🔧 How to use it
Select the Attach-Planes command from the Modify Roof menu
Select a line on your roof. The line must be horizontal and attached to one roof plane
Enter the roof type, storey, pitch and eave height/plane depth for the new panel in the dialog box. A positive number for plane depth builds the new roof plane inwards, a negative number builds it outwards from the selected line.
Click OK to insert the new roof plane.
🛠 Understanding plane direction
The direction of the new plane depends on both the pitch value and the eave height you enter:
Plane Direction | Pitch Setting | Eave Height Setting |
Down and away from current plane | Negative pitch | Lower than the selected line |
Up and away from current plane | Positive pitch | Higher than the selected line |
To have the new plane go down and away from the current plane, enter a negative pitch and an eave height lower than the selected line. To have the new plane go up and away, enter a positive pitch and an eave height higher than the selected line.
The new plane will span the entire length of the selected line.
🔧 Using Plane Depth instead of Eave Height
Sometimes you may know the depth of the plane from the eave you're attaching to, rather than the specific eave height. In this case:
Click the Eave Height button in the dialog
The button changes to Plane Depth
Enter the depth measurement from the attachment eave
⚠️ Important requirements
The selected line must be:
Horizontal
Attached to exactly one roof plane
If these conditions aren't met, you will receive an error message.
💡 Parameters explained
Parameter | Description |
Roof Type | The type of roofing material or structure for the new plane |
Storey | The building level or floor designation for the new plane |
Pitch | The angle of the new roof plane (positive for upward slope, negative for downward slope) |
Eave Height | The vertical position of the new plane's eave relative to the selected line |
Plane Depth | The horizontal distance the new plane extends from the attachment point |