Check the new DBS extension:
Inclined Edge
The extension allows to draw edges with defined inclination angle.
Key features:
- It can draw edge lines or guides.
- Offset distance makes it possible to route the edges at a specified distance from the walls.
- It also takes into consideration wall’s corners.
- It can measure the inclination angle, length, and the level height difference between the ends of the edge pointer with the cursor.
Find it here 
Inclined Edge
Watch the video
Draw inclined edge in SketchUp
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