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Sash window

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A sash window
A sash window

A sash window or hung sash window is made of one or more movable panels, or "sashes".[A] The individual sashes are traditionally paned windows, but can now contain an individual sheet (or sheets, in the case of double glazing) of glass.

History

The oldest surviving examples of sash windows were installed in England in the 1670s, for example at Ham House.[1][2] The invention of the sash window is sometimes credited, without conclusive evidence, to Robert Hooke. Others see the sash window as a Dutch invention.[3] H.J. Louw believed that the sash window was developed in England, but concluded that it was impossible to determine the exact inventor.[1]

The sash window is often found in Georgian and Victorian houses, and the classic arrangement has three panes across by two up on each of two sash, giving a six over six panel window, although this is by no means a fixed rule. Innumerable late Victorian and Edwardian suburban houses were built in England using standard sash window units approximately 4 feet (1.2 m) in width, but older, hand-made units could be of any size.

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Ham House

Ham House

Ham House is a 17th-century house set in formal gardens on the bank of the River Thames in Ham, south of Richmond in the London Borough of Richmond upon Thames. The original house was completed in 1610 by Thomas Vavasour, an Elizabethan courtier and Knight Marshal to James I. It was then leased, and later bought, by William Murray, a close friend and supporter of Charles I. The English Civil War saw the house and much of the estate sequestrated, but Murray's wife Katherine regained them on payment of a fine. During the Protectorate his daughter Elizabeth, Countess of Dysart on her father's death in 1655, successfully navigated the prevailing anti-royalist sentiment and retained control of the estate.

Robert Hooke

Robert Hooke

Robert Hooke FRS was an English polymath active as a scientist, natural philosopher and architect, who is credited to be one of the first two scientists to discover microorganisms in 1665 using a compound microscope that he built himself, the other scientist being Antoni van Leeuwenhoek in 1674. An impoverished scientific inquirer in young adulthood, he found wealth and esteem by performing over half of the architectural surveys after London's great fire of 1666. Hooke was also a member of the Royal Society and since 1662 was its curator of experiments. Hooke was also Professor of Geometry at Gresham College.

Georgian architecture

Georgian architecture

Georgian architecture is the name given in most English-speaking countries to the set of architectural styles current between 1714 and 1830. It is named after the first four British monarchs of the House of Hanover—George I, George II, George III, and George IV—who reigned in continuous succession from August 1714 to June 1830. The so-called great Georgian cities of the British Isles were Edinburgh, Bath, pre-independence Dublin, and London, and to a lesser extent York and Bristol. The style was revived in the late 19th century in the United States as Colonial Revival architecture and in the early 20th century in Great Britain as Neo-Georgian architecture; in both it is also called Georgian Revival architecture. In the United States the term "Georgian" is generally used to describe all buildings from the period, regardless of style; in Britain it is generally restricted to buildings that are "architectural in intention", and have stylistic characteristics that are typical of the period, though that covers a wide range.

Victorian architecture

Victorian architecture

Victorian architecture is a series of architectural revival styles in the mid-to-late 19th century. Victorian refers to the reign of Queen Victoria (1837–1901), called the Victorian era, during which period the styles known as Victorian were used in construction. However, many elements of what is typically termed "Victorian" architecture did not become popular until later in Victoria's reign, roughly from 1850 and later. The styles often included interpretations and eclectic revivals of historic styles (see Historicism). The name represents the British and French custom of naming architectural styles for a reigning monarch. Within this naming and classification scheme, it followed Georgian architecture and later Regency architecture, and was succeeded by Edwardian architecture.

Suburb

Suburb

A suburb, more broadly suburban area, is an area within a metropolitan area that is primarily a residential area, though may also include commercial and mixed-use areas. A suburb can exist either as part of a larger city/urban area or as a separate political entity. The name describes an area which is not as densely populated as an inner city, yet more densely populated than a rural area in the countryside. In many metropolitan areas, suburbs exist as separate residential communities within commuting distance of a city Suburbs can have their own political or legal jurisdiction, especially in the United States, but this is not always the case, especially in the United Kingdom, where most suburbs are located within the administrative boundaries of cities. In most English-speaking countries, suburban areas are defined in contrast to central or inner city areas, but in Australian English and South African English, suburb has become largely synonymous with what is called a "neighborhood" in the US, and the term encompasses inner city areas.

Mechanism and application

Exceptionally wide sash window (approximately two metres or 6.6 feet wide) in a pub in Bromyard, Herefordshire, England
Exceptionally wide sash window (approximately two metres or 6.6 feet wide) in a pub in Bromyard, Herefordshire, England

Box sash window

To facilitate operation, the weight of the glazed panel is usually balanced by a heavy steel, lead, or cast-iron sash weight or counter-weight concealed within the window frame. The sash weight is connected to the window by a braided cotton sash cord, or a chain, that runs over a pulley at the top of the frame, although spring balances are sometimes used. Repairing a broken cord requires disassembling parts of the window frame.

The term "sash windows" is used interchangeably with the term "box sash windows" in the United Kingdom, and frequently used to describe the same thing. Historically box sash windows are heavier and more stately in nature than modern sash windows, but both terms are used within the industry when referring to the same type of window.

The name "hung sash window", which is more usual in the United States than in the United Kingdom, typically refers to a double-hung window with two sashes that can move up and down in the window frame. These windows are commonly found in older buildings in warmer climates, as they promote airflow and are easy to clean. A significant advantage of double-hung windows is that they provide efficient cooling of interiors during warm weather. Opening both the top and bottom of a sash window by equal amounts allows warm air at the top of the room to escape, thus drawing relatively cool air from outside into the room through the bottom opening. A double-hung window where the upper sash is smaller (shorter) than the lower is termed a cottage window.

A single-hung window has two sashes, but normally the top sash is fixed and only the bottom sash slides. Triple- and quadruple-hung windows are used for tall openings, common in New England churches. Construction is usually of softwood, and these sashes were traditionally only single-glazed.

Simplex hinges

Sash windows may be fitted with simplex hinges, which allow the window to be locked into hinges on one side while the counterbalance on the other side is detached, allowing the window to be opened for escape or cleaning.

Glazing

The glass in old windows can be the very early 'plate' or 'broad' glass to 'crown' or 'cylinder'.[4] Old glass is recognised by its imperfections ('ream') which result in optical distortion. Traditional cylinder glass is still made, but other sorts of antique glass are no longer available.

Modern double-glazed sash windows are available. These may have true muntins or "glazing bars", or may imitate them by applying them to the surface of the glazing, giving the appearance of multiple small panes, whereas each sash consists of only one large double-glazed unit.

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Bromyard

Bromyard

Bromyard is a town in Herefordshire, England, in the valley of the River Frome. It lies near the county border with Worcestershire on the A44 between Leominster and Worcester. Bromyard has a number of traditional half-timbered buildings, including some of the pubs, and the parish church is Norman. For centuries, there was a thriving livestock market. The town is twinned with Athis-de-l'Orne, Normandy.

Herefordshire

Herefordshire

Herefordshire is a county in the West Midlands of England, governed by Herefordshire Council. It is bordered by Shropshire to the north, Worcestershire to the east, Gloucestershire to the south-east, and the Welsh counties of Monmouthshire and Powys to the west.

England

England

England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea area of the Atlantic Ocean to the southwest. It is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight.

United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. The total area of the United Kingdom is 242,495 square kilometres (93,628 sq mi), with an estimated 2023 population of over 68 million people.

United States

United States

The United States of America, commonly known as the United States or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City.

Cottage window

Cottage window

A cottage window is a double-hung window — i.e., a window with two sashes sliding up and down, hung with one atop the other in the same frame — in which the upper sash is smaller (shorter) than the lower one.

New England

New England

New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York to the west and by the Canadian provinces of New Brunswick to the northeast and Quebec to the north. The Atlantic Ocean is to the east and southeast, and Long Island Sound is to the southwest. Boston is New England's largest city, as well as the capital of Massachusetts. Greater Boston is the largest metropolitan area, with nearly a third of New England's population; this area includes Worcester, Massachusetts, Manchester, New Hampshire, and Providence, Rhode Island.

Softwood

Softwood

Softwood is wood from gymnosperm trees such as conifers. The term is opposed to hardwood, which is the wood from angiosperm trees. The main differences between hardwoods and softwoods is that the structure of hardwoods lack resin canals, whereas softwoods lack pores.

Paned window (architecture)

Paned window (architecture)

In architecture, a paned window is a window that is divided into panes of glass, usually rectangular pieces of glass that are joined to create the glazed element of the window. Window panes are often separated from other panes by lead strips, or glazing bars, moulded wooden strips known as muntins in the US.

Issues

Traditional problems with solid wooden sash windows include rot, swelling or distortion of the woodwork[5] or rattling in the wind (due to shrinkage of the wood).[6] These problems can be solved by careful repair and the introduction of draught stripping. It is also a common problem for painters to paint the sash stuck. The sliding mechanism makes sash windows more vulnerable to these problems than traditional casement windows. Sash windows are relatively high maintenance, but offer advantages in return (style, aesthetics, abides by laws (relating to older houses and buildings), natural resources etc.). However, well-maintained sash windows should last generations without needing parts replaced. It is also possible to clean all the glass from within the building by sliding the two panes to different positions.

uPVC or vinyl sash windows have become available since the first PVC window frames were being introduced in Germany in the 1960s.[7] They have come to dominate the window industry with more than 50% of all window sashes being made of vinyl in the USA as of 2017. The waterproof nature of uPVC and ease of installation are also benefits. Problems with uPVC include durability and the environmental issues. Over time the plasticizer chemicals used to make vinyl sashes flexible evaporate leaving the material brittle and prone to breaking. Vinyl is also weaker than wood and aluminum sashes and requires extra support in large window openings. Vinyl is also used on wood windows as an outside cladding to protect the wood from the weather but allow the inside of the window to take advantage of the appearance of fine wood. Vinyl is also available in a large range of colours and textures although white is by far the most common. Vinyl is limited mainly to residential usage and low rise commercial due to its flammability and the toxic fumes it produces when burned. In the future fire rated versions of UPVC windows may be used in high rise construction, but currently flammability and toxic fumes are a significant obstacle.[8]

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Source: "Sash window", Wikipedia, Wikimedia Foundation, (2023, February 27th), https://en.wikipedia.org/wiki/Sash_window.

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References
  1. ^ Due to the word's etymology, "sash" (without -es) is an alternative plural form, now used mostly by professionals.

  1. ^ a b Louw, HJ, Architectural History, Vol. 26, 1983 (1983), pp. 49–72, 144–150 JSTOR, BBC
  2. ^ "The Gardens of Ham House". London Gardens Trust. Retrieved 25 April 2015.
  3. ^ Jardine, Lisa: Going Dutch: How England Plundered Holland's Glory, Harper Press, 2008
  4. ^ "Glass and Glazing". www.rmears.co.uk. 25 October 2014. Retrieved 7 February 2016.
  5. ^ Jackson, Albert; Day, Day (2009). Popular Mechanics Complete Home How-to. New York: Hearst Books. p. 181. ISBN 9781588168030.
  6. ^ "How to Fix Rattling Windows". SFGate. Retrieved 23 March 2017.
  7. ^ "Life of a PVC-U window". British Plastics Federation. Retrieved 3 July 2017.
  8. ^ "Building Code Commission Decision". Ontario Ministry of Municipal Affairs. Retrieved 3 July 2017.
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