Menu path
Mod-Roof > Project-Gable
What it does
Project-Gable lets you realign a gable end to match a specific alignment (e.g. a property boundary) or project the gable into an existing roof plane to form a raised or lowered entry way arrangement.
You would typically use this command to help join two roofs of different eave heights into one roof.
Prerequisites
Before using this command, ensure you have:
Already drawn a gable roof
Drawn a line defining the new alignment of the gable end (if realigning)
Identified the target roof plane (if projecting)
How to use Project-Gable
Select Mod-Roof > Project-Gable
Click on the ridge line connected to the gable end you want to modify
Choose from the menu options that appear:
🔧 Command Options
Option | Description | Use When |
2-Points | Aligns the gable end to follow two points you digitise | You want to define the new alignment by clicking two specific points |
Line | Aligns the gable end to follow a line you select | You have already drawn a line showing the desired alignment |
Line-Offset | Extends the gable end to the selected line and adds an offset amount | Aligning with other geometry |
Plane | Projects the gable end into a roof plane you select | You want to create an entry way or join the gable to another roof |
Inc-Distance | Extends the entire gable end offset from the current position | change the gable overhang relative to the current position |
🛠 Using 2-Points or Line Options
After selecting 2-Points: Click two points to define the new gable alignment
After selecting Line:
Click on the line that shows your desired alignment
The gable end will realign to match your selection
After selecting Line Offset:
select the line and then specify the offset from that line:
After selecting Inc-Distance:
select the ridge line and set the offset distance:
🛠 Using the Plane Option
When you select Plane, the gable end projects along the ridge alignment to intersect with the target roof plane. Click on the "tick mark" to select the roof plane.
The software automatically handles the intersection based on these conditions:
Condition | What Happens |
Eave heights are the same | Target plane eave is cut back and new roof is accommodated |
Gable eave is lower than target plane eave | You're prompted for a "tuck under" distance (typically equal to eave offset) |
Gable eave is higher than target plane eave | Target plane is cut back and new roof is accommodated |
Projecting to a plane:
Same eave height:
Different eave height (higher):
Different eave height (lower):
Setting the 'tuck-under' of the lower eave:
💡 Understanding Tuck Under Distance
When the gable eave is lower than the target plane eave, you'll be asked for a tuck under distance. This is how far the gable eave projects under the target plane. Normally, enter a value equal to the eave offset so the eave runs into the wall, forming a lowered entry way.
⚠️ Important Notes
The tick mark is used to select roof planes - look for this visual indicator when choosing your target plane
In some conditions, no automatic editing occurs and you may need to manually adjust the intersection
The examples show how hip ends can also be realigned using the same procedures