A low protective wall extending above a roof line or balcony that provides safety, weather protection, and architectural definition to buildings.

A parapet is a low protective wall that extends above the roof line, balcony, or terrace of a building, serving both functional and aesthetic purposes in construction design. These vertical extensions of exterior walls provide safety barriers for roof access, conceal rooftop equipment and mechanical systems, protect roof edges from wind uplift, and create architectural definition and visual interest to building facades. Parapets are essential components in many building types, particularly flat-roof commercial and institutional structures, where they help manage water drainage, provide fall protection, and contribute to the overall building envelope performance while enhancing the architectural character of the structure.

Parapets are constructed in various configurations including solid parapets that extend the main wall construction above the roof level, coped parapets with protective cap stones or metal coping to shed water, stepped parapets that follow sloped roof lines with a stepped profile, perforated parapets with openings for ventilation or architectural effect, and decorative parapets that incorporate ornamental elements, cornices, or architectural details. Each type serves specific functional requirements while contributing to the building’s aesthetic design, with selection based on architectural style, climate conditions, and performance requirements.

The construction and materials of parapets typically match or complement the main building wall system, including masonry construction using brick, concrete block, or stone with appropriate reinforcement and waterproofing, concrete parapets that are cast-in-place or precast with integral or applied finishes, steel frame parapets with various cladding materials for lightweight construction, and composite systems that combine multiple materials for specific performance characteristics. Construction must address structural loads, thermal movement, water management, and integration with roofing and wall systems.

Fun Fact: The word “parapet” comes from the Italian “parapetto,” meaning “to protect the breast,” originally referring to defensive walls on medieval castles and fortifications that protected soldiers while allowing them to fire weapons.