- Click on Add Obstruction in the Site menu on the left. Select Rectangle (shortcut key W).
- Click and drag out the parapet along the wall.
- To copy a parapet hit ctrl + C and ctrl + V (or ⌘ + C and ⌘ + V on Mac).
- To adjust the parapet length, click on one of the corner nodes and drag to resize.
- To adjust the parapet height, click on the parapet and toggle the height in the right menu.