A structural projection that extends beyond the supporting wall or foundation, such as roof eaves, balconies, or cantilevered elements.

An overhang is a structural projection or extension that extends beyond the supporting wall, foundation, or other vertical structural elements, creating a horizontal or angled projection that provides functional and aesthetic benefits to buildings. Common examples include roof eaves that extend beyond exterior walls, balconies that project from building facades, cantilevered floors or decks, and architectural features such as awnings or canopies. Overhangs serve multiple purposes including weather protection, shading, architectural enhancement, and functional space extension while requiring careful structural design to ensure adequate support and stability without compromising building integrity.

Overhangs are used in various architectural and structural applications including roof eaves that protect walls and foundations from water runoff while providing shade and weather protection, balconies and terraces that extend living space beyond the building envelope, cantilevered structural elements such as floors, beams, or entire building sections that create dramatic architectural effects, covered walkways and porches that provide protected outdoor spaces, and functional projections such as loading docks, equipment platforms, or service areas. Each type of overhang requires specific structural considerations based on the loads, span, and support conditions involved.

The materials and construction methods for overhangs depend on the application and structural requirements, commonly including wood framing with joists, beams, and decking for residential applications, steel construction using beams, trusses, or cantilever systems for larger spans and commercial applications, concrete construction including cast-in-place or precast elements for permanent and fire-resistant overhangs, and composite systems that combine multiple materials for optimal performance and cost effectiveness. Material selection considers factors such as span requirements, load capacity, weather resistance, maintenance needs, and architectural appearance.

Fun Fact: The ancient Greeks perfected the use of overhangs in their temple architecture, with the Parthenon featuring precisely calculated roof overhangs that have protected the structure’s marble columns from weathering for over 2,400 years.