It can sometimes be only 100mm or 200mm above the roof and still be a parapet.
Parapet roof define.
A parapet is a part of a roof that eliminates the danger of a flat roof while opening up a wealth of opportunities to use roof space safely and effectively.
Where extending above a roof a parapet may simply be the portion of an exterior wall that continues above the edge line of the roof surface or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall.
A low wall along the edge of a roof bridge etc.
A low wall or fence at the edge of a platform roof or bridge.
Now it is a low railing or wall along the perimeter of a roof or along the edge of a bridge balcony or raised platform.
A low wall along the edge of a roof.
By definition a parapet is a vertical wall above the roof line.
These are often decorative and extend the wall above the roofline.
The word comes ultimately from the italian parapetto.
Low parapets like these are usually added for stylistic reasons and can be seen on victorian gothic and federation style houses.
A parapet is a barrier that is an extension of the wall at the edge of a roof terrace balcony walkway or other structure.
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A wall of earth or stone to protect soldiers.
The german equivalent brüstung has the same meaning.