Unfortunately many buildings get close to this height without quite meeting the height required by osha to provide fall protection.
Roof parapet height code.
In order for a roof parapet to provide adequate fall protection a roof parapet railing should be at least 42 in height.
The minimum height of a parapet wall above the roof surface is 30 inches.
The exact height of the parapet is not factored into the roof wind uplift calculations but if the parapet is 3 or higher the perimeter values can be used at the corners lowering the uplift requirements for that portion of the roof area.
The minimum height of a parapet above any wall anchor shall be 12 inches 305 mm.
2015 ibc code commentary.
Parapets are a combination of wall and roof pressures.
However when a roof slopes down toward an exterior wall and parapet with a slope greater than 2 12 further analysis is required to determine if a taller parapet is necessary.
1 every building constructed 3 stories or 36 feet or more in height shall have roof tie backs or other permanent devices installed at the roof level for the purpose of securing or tying back suspended scaffold hooks or clamps and safety lines.