The Extend Roof Slab tool to extend a slab or roof slab to a plane defined by another slab, a roof slab, or a wall. The target itself does not have to intersect with the extended slab/roof slab, as long as it projects an intersection in the current user coordinate system (UCS).
To Extend a Roof Slab:
- Select the target flat plane. It will be highlighted in green.
- Select the first edge to lengthen
- Select the second edge to lengthen
- The result will look lie this:
Another Example:
Notice that the roof slab has extended to where the wall would be if it were that tall.