Accessory components work with other precast concrete elements to provide a more unified system. They offer single-source responsibility that ensures interfaces align and no material interference arises in the field. The variety of precast concrete products available can address virtually any need for the structural shell of the building.
Balcony slabs can be either hollow-core flooring planks or solid planks. They typically cantilever off the main structural wall, providing additional floor space at little cost on multifamily, hotel and office buildings. They can be made in a wide range of shapes and sizes.
They typically are cast in widths of 2, 4 and 8 feet, although some precasters offer 10- and 12-ft widths. Six typical depths are used: 6, 8, 10, 12, 15 and 16 inches. Typical span-to-depth rations for floors range between 30 and 40, while for roofs they are 40 to 50.
Shaft walls are solid wall panels designed to provide fire protection and other necessities as dictated by the local building code. They are typically used around elevator shafts and stairwells.
As with precast panels, the walls typically are 4 to 15 feet wide and 8 to 50 feet tall, depending on the application and benefits desired.
Wall panels can be made in a long-line pretensioning facility and reinforced with prestressing strand or cast in individual forms with either prestressing strand or conventional rebar. They are cast in a horizontal position and rotated to their final position at the jobsite by the erection crew.
Since wall panels are cast in a flat orientation, the form side is typically the side that will be exposed to view in the final construction. This face can be made with virtually any type of finish. The back face is typically troweled smooth or may have a light broom finish.
Mullions are thin, often decorative pieces that fill open space in a building façade. They typically are isolated elements forming a long vertical line, requiring them to be cast perfectly straight to avoid any visual deformities. To some degree, these variations can be handled by precast concrete connections with adjustability.
They can be made in a long-line pretensioning facility and reinforced with prestressing strand or cast in individual forms with either prestressing strand or conventional rebar. They are cast in a horizontal position and rotated to their final position at the jobsite by the erection crew.
Sizes and shapes can vary to satisfy both architectural and structural requirements. They typically are square or rectangular in shape and extend up to one story tall, but longer mullions can be made.
Three of the four sides are created with a form, as they are cast in a horizontal position. They can be finished in a variety of ways, depending on the application and the architectural purpose.
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