STB Forms

Other Geometries

STB Forms can be made from additional geometries and shapes such as arches, domes and trapezoids. Such geometries are — like the shell or vaulted structure — deformed in two planes in order to optimize concrete performance. Here are examples:

Top-down view of a green arched form showing its parallel ribs running along its length
End view of a green ribbed form with an arched cross-section, resting on a dark surface
Green arched form with longitudinal ribs on a wooden table, seen from one end
Close-up of the open end of a green ribbed arch form, showing the curved shell and rib edges
Top view of a long yellow form tray holding a row of raised pyramid- and dome-shaped sections
Side view of the yellow form tray showing six raised trapezoidal and domed sections in a row