Various examples of stairs

Stairs are a structure designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. Stairs may be straight, round, or may consist of two or more straight pieces connected at angles.

Types of stairs include staircases (also called stairways), ladders, and escalators. Some alternatives to stairs are elevators (also called lifts), stairlifts, inclined moving walkways, and ramps. A stairwell is a vertical shaft or opening that contains a staircase. A flight (of stairs) is an inclined part of a staircase consisting of steps (and their lateral supports if supports are separate from steps).[1]

Components and terms

This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2018) (Learn how and when to remove this template message)

A stair, or a stairstep, is one step in a flight of stairs.[2] In buildings, stairs is a term applied to a complete flight of steps between two floors. A stair flight is a run of stairs or steps between landings. A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades and additional parts. A stairwell is a compartment extending vertically through a building in which stairs are placed. A stair hall is the stairs, landings, hallways, or other portions of the public hall through which it is necessary to pass when going from the entrance floor to the other floors of a building. Box stairs are stairs built between walls, usually with no support except the wall strings.[2]

Stairs may be in a "straight run", leading from one floor to another without a turn or change in direction. Stairs may change direction, commonly by two straight flights connected at a 90 degree angle landing. Stairs may also return onto themselves with 180 degree angle landings at each end of straight flights forming a vertical stairway commonly used in multistory and highrise buildings. Many variations of geometrical stairs may be formed of circular, elliptical and irregular constructions.[2]

Stairs may be a required component of egress from structures and buildings. Stairs are also provided for convenience to access floors, roofs, levels and walking surfaces not accessible by other means. Stairs may also be a fanciful physical construct such as the "stairs that go nowhere" located at the Winchester Mystery House. Stairs are also a subject used in art to represent real or imaginary places built around impossible objects using geometric distortion, as in the work of artist M. C. Escher.

"Stairway" is also a common metaphor for achievement or loss of a position in the society; or as a metaphor of hierarchy (e.g. Jacob's Ladder, Battleship Potemkin).

Step

Steps with 2 anti-slip rubber lines and small nosings
Steps with 2 anti-slip rubber lines and small nosings

Each step is composed of a tread and a riser. Some include nosing.

Curtail step

A decorative step at the bottom of the staircase which usually houses the volute and volute newel turning for a continuous handrail. The curtail tread will follow the flow of the volute.[4]

The railing system

A multi-flight stairway with handrails
A multi-flight stairway with handrails
Neo-Baroque wooden stair in the House of scientists, in Lviv (Ukraine)
Neo-Baroque wooden stair in the House of scientists, in Lviv (Ukraine)
Two flights of stairs joined by a landing
Two flights of stairs joined by a landing
Example of winder stairs with a simple handrail supported by three newel posts
Example of winder stairs with a simple handrail supported by three newel posts

The balustrade is the system of railings and balusters that prevents people from falling over the edge.

Handrails may be continuous (sometimes called over-the-post) or post-to-post (or more accurately newel-to-newel). For continuous handrails on long balconies, there may be multiple newels and tandem caps to cover the newels. At corners, there are quarter-turn caps. For post-to-post systems, the newels project above the handrails.

Another, more classical, form of handrailing which is still in use is the tangent method. A variant of the Cylindric method of layout, it allows for continuous climbing and twisting rails and easings. It was defined from principles set down by architect Peter Nicholson in the 18th century.

The earliest spiral staircases appear in Temple A in the Greek colony Selinunte, Sicily, to both sides of the cella. The temple was constructed around 480–470 BC.[6]

Other terms

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2018) (Learn how and when to remove this template message)
Floating staircase in Minneapolis
Floating staircase in Minneapolis
Staircase in Ford plant in Los Angeles with double bullnose and two volutes. An intermediate landing is part of this U-shaped stair.
Staircase in Ford plant in Los Angeles with double bullnose and two volutes. An intermediate landing is part of this U-shaped stair.
Apron
This is a wooden fascia board used to cover up trimmers and joists exposed by stairwell openings. The apron may be moulded or plain, and is intended to give the staircase a cleaner look by cloaking the side view.[7]

Measurements

The measurements of a stair, in particular the rise height and going of the steps, should remain the same along the stairs.[11]

The following stair measurements are important:

Stairway Measurements.svg
A quite unusual "variable rise" stairway, which also distorts visual perspective (at The Duomo in Urbino, Italy)
A quite unusual "variable rise" stairway, which also distorts visual perspective (at The Duomo in Urbino, Italy)

Forms

Stairs with heavy pedestrian traffic
Stairs with heavy pedestrian traffic
Stairs going into a plane
Stairs going into a plane
The Cascade of Yerevan, a giant stairway made of limestone in Armenia
The Cascade of Yerevan, a giant stairway made of limestone in Armenia
Wooden stairs at the shores of Lake Iso-Melkutin in Loppi, Finland
Wooden stairs at the shores of Lake Iso-Melkutin in Loppi, Finland

Stairs can take a large number of forms, combining winders and landings.

The simplest form is the straight flight of stairs, with neither winders nor landings. These types of stairs were commonly used in traditional homes as they are relatively easy to build and only need to be connected at the top and bottom; however, many modern properties may not choose straight flights of stairs because:

Another form of straight staircase is the space saver staircase, also known as paddle stairs or alternating tread staircases, that can be used for a steeper rise, but these can only be used in certain circumstances and must comply with regulations.

However, a basic straight flight of stairs is easier to design and construct than one with landings or winders. Although the rhythm of stepping is not interrupted in a straight run, which may offset the increased fall risk by helping to prevent a misstep in the first place, many stairs will require landings or winders to comply with safety standards in the Building Regulations.[12]

Straight stairs can have a mid-landing incorporated, but it is probably more common to see stairs that use a landing or winder to produce a bend in the stairs as a straight flight with a mid-landing will require a lot of linear space and is more commonly found in commercial buildings. "L" shaped stairways have one landing and usually change in direction by 90 degrees. "U" shaped stairs may employ a single wider landing for a change in direction of 180 degrees, or two landings for two changes in direction of 90 degrees each. A Z-shaped staircase incorporates two parallel 90° turns, creating a shape similar to that of the letter ‘Z’ if seen from above. Use of landings and a possible change of direction have the following effects:

Other forms include stairs with winders that curve or bend at an acute angle, three flight stairs that join at a landing to form a T-shape, and stairs with balconies and complex designs can be produced to suit individual properties.

A mono string staircase is a term used for a steel spine staircase with treads.

A double string staircase has two steel beams on either side and treads in the center.

Spiral and helical stairs

This article or section appears to contradict itself on the difference between spiral and helical stairs. Please see the talk page for more information. (September 2021)

See also: List of ancient spiral stairs

"Spiral staircase" redirects here. For other uses, see Spiral staircase (disambiguation).

"Circular staircase" redirects here. For the novel, see The Circular Staircase.

Spiral stairs, sometimes referred to in architectural descriptions as vice, wind around a newel (also the central pole). In Scottish architecture, they are commonly known as a turnpike stair. They typically have a handrail on the outer side only, and on the inner side just the central pole. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps (larger where they extend into a corner of the square). A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area.

The earliest spiral stairs architectural image was shown on a white terra cotta pot discovered in Hunan China, 7400 years ago.

Spiral stairs have the disadvantage of being very steep if they are tight or are otherwise not supported by a centre column, for two reasons:

An example of perimeter support is the Vatican stairwell shown in the next section or the gothic stairwell shown to the left. That stairwell is only tight because of its design in which the diameter must be small. Many spirals, however, have sufficient width for normal size treads (8 inches) by being supported by any combination of a center pole, perimeter supports attaching to or beneath the treads, and a helical handrail. In this manner, the treads may be wide enough to accommodate low rises. In self-supporting stairs the spiral needs to be steep to allow the weight to distribute safely down the spiral in the most vertical manner possible. Spiral steps with centre columns or perimeter support do not have this limitation. Building codes may limit the use of spiral stairs to small areas or secondary usage if their treads are not sufficiently wide or have risers above nine and a half inches.[13]

The term "spiral" has a more narrow definition in a mathematical context, as a mathematical spiral lies in a single plane and moves towards or away from a central point. The mathematical term for motion where the locus remains at a fixed distance from a fixed line whilst moving in a circular motion about it is "helical". The presence or otherwise of a central pole does not affect the terminology applied to the design of the structure.

When used in Roman architecture spiral stairs were generally restricted to elite structures. They were then adopted into Christian ecclesiastic architecture.[14] There is a common misconception that spiral staircases in castles rose in a clockwise direction to hinder right-handed attackers.[15][16] While clockwise spiral staircases are more common in castles than anti-clockwise, they were even more common in medieval structures without a military role such as religious buildings.[17] Studies of spiral stairs in castle have concluded that "the role and position of spirals in castles ... had a much stronger domestic and status role than a military function"[17] and that "there are sufficient examples of anticlockwise stairs in Britain and France in [the 11th and 12th centuries] to indicate that the choice must have depended both on physical convenience and architectural practicalities and there was no military ideology that demanded clockwise staircases in the cause of fighting efficiency or advantage".[15]

Developments in manufacturing and design have led to the introduction of kit form spiral stairs. Steps and handrails can be bolted together to form a complete unit. These stairs can be made out of steel, timber, concrete or a combination of materials.

Helical or circular stairs do not have a central pole and there is a handrail on both sides. These have the advantage of a more uniform tread width when compared to the spiral staircase. Such stairs may also be built around an elliptical or oval platform.

Both double spiral and double helix staircases are possible, with two independent helical stairs in the same vertical space, allowing one person to ascend and another to descend, without ever meeting if they choose different helices. For examples, the Pozzo di S. Patrizio allows one-way traffic so that laden and unladen mules can ascend and descend without obstruction, while Château de Chambord, Château de Blois, and the Crédit Lyonnais headquarters ensure separation for social purposes. Fire escapes, though built with landings and straight runs of stairs, are often functionally double helices, with two separate stairs intertwined and occupying the same floor space. This is often in support of legal requirements to have two separate fire escapes.

Both spiral and helical stairs can be characterized by the number of turns that are made. A "quarter-turn" stair deposits the person facing 90 degrees from the starting orientation. Likewise, there are half-turn, three-quarters-turn and full-turn stairs. A continuous spiral may make many turns depending on the height. Very tall multi-turn spiral staircases are usually found in old stone towers within fortifications, churches and in lighthouses.

Winders may be used in combination with straight stairs to turn the direction of the stairs. This allows for a large number of permutations.

Alternating tread stairs or 'Witches stairs'

Where there is insufficient space for the full run length of normal stairs, alternating tread stairs may be used. Alternating tread stairs allow for a safe forward-facing descent of very steep stairs. The treads are designed such that they alternate between treads for each foot: one step is wide on the left side; the next step is wide on the right side. There is insufficient space on the narrow portion of the step for the other foot to stand, hence the person must always use the correct foot on the correct step. The slope of alternating tread stairs can be as high as 65 degrees as opposed to standard stairs, which are almost always less than 45 degrees. The advantage of alternating tread stairs is that people can descend face forward. The only other alternative in such short spaces would be a ladder which requires backward-facing descent. Alternating tread stairs may not be safe for small children, the elderly or the physically challenged. Building codes typically classify them as ladders and will only allow them where ladders are allowed, usually basement or attic utility or storage areas not frequently accessed.

These stairs are nowadays commonly referred to as 'Witches stairs', in the belief that they were created during an earlier era in an attempt to repel witches who were thought to be unable to climb such stairs. Such an origin of the term has since been disproved however, with experts finding no mention in any historical literature of stairs that were believed to prevent access by witches.[18]

Alternating tread stairs have been in use since at least 1888.[19]

The blocks-model in the image illustrates the space efficiency gained by an alternating tread stair. The alternating tread stair appears in the image's center, with green-colored treads. The alternating stair requires one unit of space per step: the same as the half-width step on its left, and half as much as the full-width stair on its right. Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.

The horizontal distance between steps is reduced by a factor less than two if for construction reasons there are narrow "unused" steps.

There is often (here also) glide plane symmetry: the mirror image with respect to the vertical center plane corresponds to a shift by one step.

Ergonomics and building code requirements

On a rarely used staircase from before 1754, the Crown Princess of Sweden ascends from the Stockholm Palace garden with her husband and baby in 2013.
On a rarely used staircase from before 1754, the Crown Princess of Sweden ascends from the Stockholm Palace garden with her husband and baby in 2013.
Staircase
Staircase

Ergonomically and for safety reasons, stairs must have certain measurements so that people can comfortably use them. Building codes typically specify certain measurements so that the stairs are not too steep or narrow.

Nicolas-François Blondel in the last volume of his Cours d'architecture[20] (1675–1683) was the first known person to establish the ergonomic relationship of tread and riser dimensions.[21] He specified that 2 × riser + tread = step length.[22]

It is estimated that a noticeable misstep occurs once in 7,398 uses and a minor accident on a flight of stairs occurs once in 63,000 uses.[23] Stairs can be a hazardous obstacle for some, so some people choose to live in residences without stairs so that they are protected from injury.[24]

Stairs are not suitable for wheelchairs and other vehicles. A stairlift is a mechanical device for lifting wheelchairs up and down stairs. For sufficiently wide stairs, a rail is mounted to the treads of the stairs, or attached to the wall. A chair is attached to the rail and the person on the chair is lifted as the chair moves along the rail.

UK requirements

This section is written like a manual or guidebook. Please help rewrite this section from a descriptive, neutral point of view, and remove advice or instruction. (June 2021) (Learn how and when to remove this template message)
Staircase between levels at Cabot Circus shopping centre, Bristol, England, United Kingdom. A sitting area is provided on the right of the staircase proper.
Staircase between levels at Cabot Circus shopping centre, Bristol, England, United Kingdom. A sitting area is provided on the right of the staircase proper.

(overview of Approved document K – Stairs, Ladders and Ramps)[25]

The 2013 edition "approved document K" categorises stairs as private, utility and general access

When considering stairs for private dwellings all the specified measurements are in millimetres.

Building regulations are required for stairs used where the difference of level is greater than 600

Steepness of stairs – rise and going

Any rise between 150 and 220 used with any going between 220 and 300

Maximum rise 220 and minimum going 220 remembering that the maximum pitch of private stairs is 42°. The normal relationship between dimensions of the rise and going is that twice the rise plus the going (2R + G) should be between 550 and 700

Construction of steps

Steps should have level treads, they may have open risers but if so treads should overlap at least 16mm. Domestic private stairs are likely to be used by children under 5 years old so the handrail ballister spacing should be constructed so that a 100mm diameter sphere cannot pass through the opening in the risers in order to prevent children from sticking their heads through them and potentially getting stuck.

Headroom

A headroom of 2000mm is adequate. Special considerations can be made for loft conversions.

Width of flights

No recommendations are given for stair widths.

Length of flights

The approved document refers to 16 risers (steps) for utility stairs and 12 for general access. There is no requirement for private stairs. In practice there will be fewer than 16 steps as 16 x 220 gives over 3500 total rise (storey height) which is way above that in a domestic situation.

Landings

Level, unobstructed landings should be provided at the top and bottom of every flight. The width and length being at least that of the width of the stairs and can include part of the floor. A door may swing across the landing at the bottom of the flight but must leave a clear space of at least 400 across the whole landing

Tapered steps

There are special rules for stairs with tapered steps as shown in the image Example of Winder Stairs above

Alternate tread stairs can be provide in space saving situations

Guarding

Flights and landings must be guarded at the sides where the drop is more than 600mm. As domestic private stairs are likely to be used by children under 5 the guarding must be constructed so that a 100mm diameter sphere cannot pass through any opening or constructed so that children will not be able to climb the guarding. The height for internal private stairs should be at least 900 mm (35.4 in) and be able to withstand a horizontal force of 0.36|kN/m|.

US requirements

American building codes, while varying from State to State and County to County, generally specify the following parameters:[26][27][28]

Stairs and art

A staircase in Aarhus City Hall, Denmark. The dark grey, kidney-shaped capstone seen at the bottom of the stairwell contains the three foundation stones of the building and was used as the reference point for height adjustment during the entire building period
A staircase in Aarhus City Hall, Denmark. The dark grey, kidney-shaped capstone seen at the bottom of the stairwell contains the three foundation stones of the building and was used as the reference point for height adjustment during the entire building period
This section may need to be rewritten to comply with Wikipedia's quality standards, as it does not describe the topic of the section meaningfully. You can help. The talk page may contain suggestions. (June 2021)

As much as stairs are very functional, stairs can be very decorative and an impressive part of a building. Especially at the entrance of a large building stairs play an important role in the first impression of a building. In large buildings such as banks this is very popular. Modern companies and construction utilize the opportunities of functional stairs to actually upgrade buildings. Large utilities such as banks as well as residential buildings such as penthouses (e.g. in St George Wharf Tower) have modern and luxurious installations.

Notable sets of stairs

The world's longest stairway at the Niesenbahn funicular in Switzerland has 11,674 steps
The world's longest stairway at the Niesenbahn funicular in Switzerland has 11,674 steps
A wide shot of the massacre on the "Odessa Steps" from the 1925 silent film Battleship Potemkin
A wide shot of the massacre on the "Odessa Steps" from the 1925 silent film Battleship Potemkin

Gallery

See also

References

  1. ^ "U.S. Access Board Guide to ADA Standards Chapter 4: Ramps and Curb Ramps". United States Access Board.
  2. ^ a b c R.E. Putnam and G.E. Carlson, Architectural and Building Trades Dictionary, Third Edition, American Technical Publishers, Inc., 1974, ISBN 0-8269-0402-5
  3. ^ "Stair Nosing". www.amstep.com. Retrieved 2018-01-26.
  4. ^ "Stair Part Terminology 2 - Useful Words To Know". Blueprint Joinery. Retrieved 2018-11-02.
  5. ^ "Banister". Merriam Webster dictionary. Retrieved 2 November 2010.
  6. ^ Ruggeri, Stefania (2006) Selinunt, Affinità Elettive, Messina, ISBN 88-8405-079-0, p. 77
  7. ^ "Staircase glossary". www.wonkeedonkeerichardburbidge.co.uk.
  8. ^ "flight". www.lexico.com.
  9. ^ Hsu, Tiffany (28 October 2016). "Floating staircases make their work look light and easy". Los Angeles Times. Retrieved 2018-01-26.
  10. ^ Terminology. Stairplace.co.uk. Retrieved on 2013-11-11.
  11. ^ a b c d Neufert, Ernst; Neufert, Peter (2000). Architects' Data (3rd ed.). Blackwell Science. p. 191. ISBN 0-632-05771-8.
  12. ^ "Info" (PDF). www.legislation.gov.uk. 2010.
  13. ^ "2018 International Residential Code Section R311 Means of Egress". International Code Council (ICC). 2018.
  14. ^ Ryder, Charles (2011). The spiral stair or vice: its origins, role and meaning in medieval stone castles (PhD). University of Liverpool. p. 120. open access
  15. ^ a b Guy, Neil (2011–2012), "The Rise of the Anticlockwise Newel Stair" (PDF), The Castle Studies Group Journal, 25: 114, 163 open access
  16. ^ Wright, James (9 October 2019), Guest Post: Busting Mediaeval Building Myths: Part One, History... the interesting bits!, retrieved 24 February 2020
  17. ^ a b Ryder, Charles (2011). The spiral stair or vice: its origins, role and meaning in medieval stone castles (PhD). University of Liverpool. p. 293–294. open access
  18. ^ "Fact Check-Alternating tread stairs were not historically built to ward off witches". Reuters Fact Check. Reuters. 9 March 2021. Archived from the original on 5 February 2022. Retrieved 5 February 2022.
  19. ^ James H. Monckton (1891). Moncktons One Plane Method Of Hand Railing and Stair Building, Copyright 1888. John Wiley & Sons. p. Plate 2, Figure 4.
  20. ^ Blondel, François (1698). Cours D'Architecture Enseigné Dans L'Academie Royale D'Architecture. Vol. 4 & 5. pp. 692 & 693. doi:10.11588/DIGLIT.1567. Retrieved 14 August 2012.
  21. ^ Bartlett, James (1911). "Staircase" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 25 (11th ed.). Cambridge University Press. p. 763.
  22. ^ "Generativeart.com Koutamanis, GA". Retrieved 2019-11-22.
  23. ^ "Stair Safety: A Review of the Literature and Data Concerning Stair Geometry and Other Characteristics". Archived from the original on 23 September 2006. Retrieved 2 November 2010.
  24. ^ Haggerty, Maryann (2010-08-14). "Stairs can pose a problem as you get older, so take steps now to ease the climb". The Washington Post. ISSN 0190-8286. Retrieved 2018-01-26.
  25. ^ The Building Regulations 2000: Protection from falling, collision and impact. Office of the Deputy Prime Minister. inbalance-energy.co.uk
  26. ^ "A-Mezz Engineered IBC Stairs". Retrieved 2 November 2010.
  27. ^ Codes. Amezz.com. Retrieved on 2013-11-11.
  28. ^ Stairway Manufacturers' Association. Stairways.org. Retrieved on 2013-11-11.
  29. ^ Section 3231(c) of the State of California Building Code specifies a rise between 4 and 7.5 inches (100 and 190 mm) and a minimum run of 10 inches (250 mm).
  30. ^ "Popular Mechanics homepage". Archived from the original on 22 April 2009. Retrieved 2 November 2010.
  31. ^ NFPA 101 Life Safety Code Handbook Tenth Edition 2006, Coté and Harrington, ISBN 0-87765-697-5, pg.167
  32. ^ "Architectural Barriers Texas Accessibility Standards". Texas Department of Licensing & Regulation. 2012.
  33. ^ "Information and Technical Assistance on the Americans with Disabilities Act 504 Stairways". ADA.gov United States Department of Justice Civil Rights Division. 2010.
  34. ^ "Science and Technology/Structures/Long Stairway". Guinness World Records. Archived from the original on 2005-11-19. Retrieved 2019-11-19.
  35. ^ "Srivari Mettu: Shorter, arduous path to Tirumala".
  36. ^ http://www.ndtv.com/convergence/ndtv/story.aspx?id=NEWEN20070026005[bare URL]
  37. ^ http://epaperbeta.timesofindia.com/Article.aspx?eid=31809&articlexml=273-cr-devotees-visited-Tirumala-last-year-TTD-07012017010041[bare URL]
  38. ^ http://www.hindu.com/2003/09/30/stories/2003093003080300.htm[bare URL]
  39. ^ "Alipiri | Reach Tirumala by Walk | Tirumala Foot Steps Timings, Luggage Counter". 25 March 2020.
  40. ^ "Srivari Mettu: Distance | Location | Timings | History | Steps Count | Starting Point". 6 April 2020.
  41. ^ Suetonius, The Lives of Twelve Caesars, Life of Tiberius 61
  42. ^ "Welcome to Lysefjord". Archived from the original on 7 May 2007. Retrieved 2 November 2010.
  43. ^ Misaka Promenade, Japan's Longest Stone Steps Misato Town Office
  44. ^ National Commission on Terrorist Attacks (July 22, 2004). The 9/11 Commission Report (first ed.). W. W. Norton & Company. p. 294. ISBN 0-393-32671-3.
  45. ^ "Monument". www.cityoflondon.gov.uk. City of London. 28 April 2009. Archived from the original on 20 June 2009. Retrieved 28 April 2009.
  46. ^ The Cascade Complex. Cmf.am. Retrieved on 2013-11-11.