Main string design
In the design of these types of Staircases, strings can be flat bar, beam, or even a central tubular spine. The ‘ sky’s the limit ‘ with design, & exotic applications can considered the norm !!!! Helical Staircases can be designed in an ‘ elliptical ‘ shape ………..this results in challenging manufacturing techniques but innovative design……….
Tread design
Commonly treads are made from folded ‘ pans ‘, this is a tray which can take a variety of finishes from timber, mosaic ,tiles, marble .........etc.. In some instances, only a tread support is provided which enables timber tread utilisation. Note : in the modern day, it is a mandatory building control requirement to incorporate ‘ closed risers ‘ in treads. Closed risers can be incorporated as part of the tread or a glass riser included……………
balustrade & handrail design
Helical/Spiral Staircase balustrades/handrails are in many cases designed to provide guarding as both a feature & edge protection for both adults & children.
This can be carried out by utilising different types of infill. Glass, perforated sheet, vertical round bar, etc., are just some of the types used quite commonly..........in real terms budget is a major influencing factor.
stair locating & building interfaces
Spiral /Helical Staircases are often designed to be free standing, however normally it is possible to design a first fix item into the main building slab or steel for connection purposes. When carried out externally, attention will be paid to waterproofing.