Menu path
Modify Roof > Bay-Window
What it does: The Bay-Window command lets you insert a projecting bay window structure onto an existing roof eave. This creates a three-dimensional extension with angled side walls that connects to your main roof structure.
How to use it:
Select the Bay-Window command from the Modify Roof menu
Click on the eave line where you want to place the bay window
The Bay Window Dialog box will appear with dimension and angle settings
Configure the parameters as described below
Click OK to create the bay window
🧾 Bay Window Parameters
Field | Description |
Distance along eave | Distance from the left end of the selected eave to the start of the bay window |
Out step length | Perpendicular distance the bay window projects away from the original eave line |
Face length | Length of the front face of the bay window (parallel to the original eave) |
Skew length | Length of the angled side walls that connect the projection to the front face |
Angle | Angle of the skew (side) lines relative to the eave (0-90 degrees) |
Pitch | Roof pitch of the front face plane |
Zero length ridge | Yes or No - controls how the bay window connects to the main roof |
🔧 Zero Length Ridge Options
No: The pitch of the front face plane is calculated to intersect the main roof plane with no ridge line created. This creates a seamless connection.
Yes: Maintains the specified pitch for the front face, which may create a ridge line where it meets the main roof.
💡 Design Tips
The angled side planes are automatically calculated to properly connect the bay window projection to the main roof structure, ensuring weatherproof intersections.
The relationship between angle and skew length determines the overall shape of your bay window - smaller angles create more rectangular bays, while larger angles create more triangular projections.
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