A parapet is a low protective wall or barrier that extends above the edge of a roof, balcony, terrace, bridge, or other structure. Typically constructed of masonry, concrete, metal, or stone, a parapet serves to prevent falls, conceal rooftop equipment, and provide a fire-resistant barrier between adjoining buildings. Though often less than three feet high, parapets play a critical role in both the safety and aesthetics of a building’s exterior.
In practice, parapets are built as either plain or stepped walls that cap the outer edge of a roof or deck. In residential construction, they may appear on flat-roofed townhomes or rooftop decks to create a secure enclosure. In commercial settings, they frequently conceal HVAC units, elevator overruns, and plumbing vents. Unlike simple guardrails, parapets are integrated into the structural wall system and often include flashing and coping to divert water away from the building’s face. Proper design must account for wind loads, moisture management, and fire separation requirements, distinguishing a parapet from a non‐structural railing or balustrade.