This glossary of staircase related terminology is by no means exhaustive but does detail the most common and basic terms used in staircase construction and balustrading installation.
Baluster/Spindle – the vertical member, plain or decorative, that acts as the infill between the handrail and baserail (or tread if cut string).
Balustrading – the collective name for the complete assembly of handrails, baserails, newels, spindles and caps.
Bullnose Step – usually at the bottom of the stairs with one or both ends of the step having a quarter circle design.
Closed String – a string with the face housed/trenched to accommodate treads and risers so their profile cannot be seen.
Continuous Handrail – using straight lengths of handrail connected to handrail fittings and ramps, the handrail flows over the tops of newel turnings creating a continuous run of handrail.
Curtail Step – a decoratively shaped step at the bottom of the stairs usually accommodating the volute and volute newel turning of the Continuous Handrail System.
Cut or Open String – a string with the upper edge cut away to the shape of the treads and risers so that their profile can be seen from the side.
Going – the going of a flight of stairs is the horizontal distance between the face of the first and last risers. The individual going of a step is measured from face of riser to face of riser and for domestic use should be a minimum of 220mm.
Newel – accommodates the strings, handrails and treads/risers of stairs.
Nosing – the edge of the tread projecting beyond the face of the riser and the face of a cut string.
OAS – OAS refers to the width of the Staircase = Width Overall Strings.
Pitch – the angle between the pitch line and the horizontal.
Pitch Line – the notional line connecting the nosings of all
treads in a flight of stairs.
Rake – the pitch of the stairs.
Riser – the board that forms the face of the step. The maximum individual rise for domestic flights is 220mm.
Staircase – the entire structure relating to a stair, comprising steps, treads, risers, strings, balustrading, landings etc.
Stairway/Stairwell – the space/void provided for the stairs.
Stelten – Stelten is the Handrail Fixing we use on our Staircases Stelten is Short for Steel Tenon
Step – the tread and riser combined.
String Margin – the distance between the top of the string and the pitch line measured at 90° to the pitch line.
Tread – the top or horizontal surface of a step.
Volute – The detail like a Scroll at the entry of a handrail, sometimes called a Monkey’s Tail, – New Ascending Volute
Wall String – the string of a staircase fixed flush with a wall.
Winders – are radiating steps narrower at one end that are used to change the direction of stairs through 90° or 180°.