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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 Palace House,^[1] and Ham House.^[2]^[3] The invention of the sash window is sometimes credited, without conclusive evidence, to Robert Hooke. Others see the sash window as a Dutch invention.^[4] H.J. Louw believed that the sash window was developed in England, but concluded that it was impossible to determine the exact inventor.^[2]

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.

Mechanism and application

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.^{[citation needed]}

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.^{[citation needed]}

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.^{[citation needed]}

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,^{[citation needed]} 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.^{[citation needed]}

Glazing

The glass in old windows can be the very early 'plate' or 'broad' glass to 'crown' or 'cylinder'.^[5] 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.^{[citation needed]}

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. ^{[citation needed]}

Issues

Traditional problems with solid wooden sash windows include rot, swelling or distortion of the woodwork^[6] or rattling in the wind (due to shrinkage of the wood).^[7] 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.^[8] 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^{[citation needed]}. 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.^[9]

References

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

^ "A. P. Baggs: The Earliest Sash-Window in Britain?" (PDF). The Georgian Group Journal, Vol. VII, 1997, pp. 168–171.
^ ^a ^b Louw, HJ, Architectural History, Vol. 26, 1983 (1983), pp. 49–72, 144–150 JSTOR, BBC
^ "The Gardens of Ham House". London Gardens Trust. Retrieved 25 April 2015.
^ Jardine, Lisa: Going Dutch: How England Plundered Holland's Glory, Harper Press, 2008
^ "Glass and Glazing". www.rmears.co.uk. 25 October 2014. Retrieved 7 February 2016.
^ Jackson, Albert; Day, Day (2009). Popular Mechanics Complete Home How-to. New York: Hearst Books. p. 181. ISBN 9781588168030.
^ "How to Fix Rattling Windows". SFGate. 18 April 2012. Retrieved 23 March 2017.
^ "Life of a PVC-U window". British Plastics Federation. Retrieved 3 July 2017.
^ "Building Code Commission Decision". Ontario Ministry of Municipal Affairs. Retrieved 3 July 2017.

External links

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

[2] "A. P. Baggs: The Earliest Sash-Window in Britain?" (PDF). The Georgian Group Journal, Vol. VII, 1997, pp. 168–171.

[Louw-3] Louw, HJ, Architectural History, Vol. 26, 1983 (1983), pp. 49–72, 144–150 JSTOR, BBC

[4] "The Gardens of Ham House". London Gardens Trust. Retrieved 25 April 2015.

[5] Jardine, Lisa: Going Dutch: How England Plundered Holland's Glory, Harper Press, 2008

[6] "Glass and Glazing". www.rmears.co.uk. 25 October 2014. Retrieved 7 February 2016.

[7] Jackson, Albert; Day, Day (2009). Popular Mechanics Complete Home How-to. New York: Hearst Books. p. 181. ISBN 9781588168030.

[8] "How to Fix Rattling Windows". SFGate. 18 April 2012. Retrieved 23 March 2017.

[Life-9] "Life of a PVC-U window". British Plastics Federation. Retrieved 3 July 2017.

[Building_Code_Decision-10] "Building Code Commission Decision". Ontario Ministry of Municipal Affairs. Retrieved 3 July 2017.

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@@ Line 1: / Line 1: @@
-{{short description|Window made of one or more movable panels}}
+{{Short description|Window made of one or more movable panels}}
 [[File:DETAIL_OF_(SINGLE_SASH)_WINDOW,_WEST-FRONT_FACADE_-_Moncure_Building,_1415_North_Court_House_Road,_Arlington,_Arlington_County,_VA_HABS_VA,7-ARL,7-7.tif|right|thumb|A sash window]]
-A '''sash window''' or '''hung sash window''' is made of one or more movable panels, or "sashes",{{efn-ua|Due to the word's etymology, "sash" (without ''-es'') is an alternative plural form, now used mostly by professionals.}} that form a frame to hold panes of glass, which are often separated from other panes (or "lights") by [[glazing in architecture|glazing]] bars, also known as [[muntin]]s in the US (moulded strips of [[wood]]).<ref>{{cite book | first = Francis | last = Ching | year = 1997 | title = A Visual Dictionary of Architecture | location = New York | publisher = Van Nostrand Reinhold | isbn = 0-442-02462-2}}</ref> Although any [[window]] with this style of glazing is technically a sash, the term is used almost exclusively to refer to windows where the glazed panels are opened by sliding vertically, or horizontally in a style known as a "[[Yorkshire]] light", sliding sash, or sash and case (so called because the weights are concealed in a box case).
+A '''sash window''' or '''hung sash window''' is made of one or more movable panels, or "sashes".{{efn-ua|Due to the word's etymology, "sash" (without ''-es'') is an alternative plural form, now used mostly by professionals.}} The individual sashes are traditionally [[paned window (architecture)|paned window]]s, 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]].<ref name="Louw">Louw, HJ, ''Architectural History'', Vol. 26, 1983 (1983), pp. 49–72, 144–150 [https://www.jstor.org/stable/1568434 JSTOR], [http://news.bbc.co.uk/1/hi/england/hampshire/4854554.stm BBC]</ref><ref>{{Cite web|url=http://www.londongardenstrust.org/features/ham.htm|title=The Gardens of Ham House|publisher=London Gardens Trust|accessdate=25 April 2015}}</ref> The invention of the sash window is sometimes credited, without conclusive evidence, to [[Robert Hooke]]. Others see the sash window as a Dutch invention.<ref>Jardine, Lisa: ''Going Dutch: How England Plundered Holland's Glory'', Harper Press, 2008</ref> H.J. Louw believed that the sash window was developed in England, but concluded that it was impossible to determine the exact inventor.<ref name="Louw"/>
+The oldest surviving examples of sash windows were installed in England in the 1670s, for example at [[Palace House]],<ref>{{cite web | title = A. P. Baggs: The Earliest Sash-Window in Britain?| publisher=The Georgian Group Journal, Vol. VII, 1997, pp. 168–171 | url = https://georgiangroup.org.uk/wp-content/uploads/2020/10/GGJ_1997_Vol_7_16_Baggs_0001.pdf}}</ref> and [[Ham House]].<ref name="Louw">Louw, HJ, ''Architectural History'', Vol. 26, 1983 (1983), pp. 49–72, 144–150 [https://www.jstor.org/stable/1568434 JSTOR], [http://news.bbc.co.uk/1/hi/england/hampshire/4854554.stm BBC]</ref><ref>{{Cite web|url=http://www.londongardenstrust.org/features/ham.htm|title=The Gardens of Ham House|publisher=London Gardens Trust|access-date=25 April 2015}}</ref> The invention of the sash window is sometimes credited, without conclusive evidence, to [[Robert Hooke]]. Others see the sash window as a Dutch invention.<ref>Jardine, Lisa: ''Going Dutch: How England Plundered Holland's Glory'', Harper Press, 2008</ref> H.J. Louw believed that the sash window was developed in England, but concluded that it was impossible to determine the exact inventor.<ref name="Louw"/>
 The sash window is often found in [[Georgian architecture|Georgian]] and [[Victorian architecture|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 period|Edwardian]] [[suburb]]an houses were built in England using standard sash window units approximately 4 feet (1.2&nbsp;m) in width, but older, hand-made units could be of any size.
@@ Line 11: / Line 11: @@
 [[File:BigSashWindowBromyard.jpg|thumb|300px|Exceptionally wide sash window (approximately {{convert|2|m|spell=in|ft|disp=or}} 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 balance]]s are sometimes used. Repairing a broken cord requires disassembling parts of the window frame.<ref>{{cite web| url=https://londonsashwindows.com/|title= Sash Window Repairs }} Monday, 7 January 2019 </ref>
+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 balance]]s are sometimes used. Repairing a broken cord requires disassembling parts of the window frame.{{Citation needed|date=November 2022}}
+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.{{Citation needed|date=November 2022}}
-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.
+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'''{{anchor|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]].{{Citation needed|date=November 2022}}
-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.
+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]],{{Citation needed|date=November 2022}} and these sashes were traditionally only single-glazed.
-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'''{{anchor|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]].{{citation needed|reason= [[Cottage window]] has no references at all.  |date=August 2016}}
+===Simplex hinges===
-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.
+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.{{Citation needed|date=November 2022}}
+===Glazing===
-Construction is usually of [[softwood]], and these sashes were traditionally only single-glazed.
+The glass in old windows can be the very early 'plate' or 'broad' glass to 'crown' or 'cylinder'.<ref>{{cite web| title=Glass and Glazing| date= 25 October 2014| url= http://www.rmears.co.uk/our-publications/glass-and-glazing/| publisher=www.rmears.co.uk| access-date=7 February 2016}}</ref> 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.{{Citation needed|date=November 2022}}
+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 [[Paned window (architecture)|panes]], whereas each sash consists of only one large double-glazed unit. {{Citation needed|date=November 2022}}
-The glass in old windows can be the very early 'plate' or 'broad' glass to 'crown' or 'cylinder'.<ref>{{cite web| title=Glass and Glazing| url= http://www.rmears.co.uk/our-publications/glass-and-glazing/| publisher=www.rmears.co.uk| accessdate=7 February 2016}}</ref> 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 [[paned window|panes]], whereas each sash consists of only one large double-glazed unit.
 == Issues ==
-Traditional problems with [[solid wood]]en sash windows include [[Dry rot|rot]], swelling or distortion of the woodwork<ref>{{cite book | last1 = Jackson| first1 = Albert | last2 = Day | first2 = Day| authorlink = | coauthors = | title = Popular Mechanics Complete Home How-to| publisher = Hearst Books| series = | volume = | edition = | date = 2009| location = New York| pages = 181| language = | url = https://books.google.com/books?id=RTC8yFaw7ioC&pg=PA181| doi = | id = | isbn = | mr = | zbl = | jfm = }}</ref> or rattling in the wind (due to shrinkage of the wood).<ref>{{cite web | last = | first = | authorlink = | coauthors = | title = How to Fix Rattling Windows| work = SFGate| publisher = | date = | url = http://homeguides.sfgate.com/fix-rattling-windows-25171.html| format = | doi = | accessdate = 23 March 2017 }}</ref> 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 window]]s. 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.
+Traditional problems with [[solid wood]]en sash windows include [[Dry rot|rot]], swelling or distortion of the woodwork<ref>{{cite book | last1 = Jackson| first1 = Albert | last2 = Day | first2 = Day| title = Popular Mechanics Complete Home How-to| publisher = Hearst Books| date = 2009| location = New York| pages = 181| isbn = 9781588168030 | url = https://books.google.com/books?id=RTC8yFaw7ioC&pg=PA181}}</ref> or rattling in the wind (due to shrinkage of the wood).<ref>{{cite web | title = How to Fix Rattling Windows| work = SFGate| date = 18 April 2012| url = http://homeguides.sfgate.com/fix-rattling-windows-25171.html| access-date = 23 March 2017 }}</ref> 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 window]]s. 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.
-{{Disputed-section|date=August 2019}}
+{{Disputed section|date=August 2019}}
-[[uPVC]] or vinyl sash windows have become available since the first PVC window frames were being introduced in Germany in the 1960s.<ref name=Life>{{Cite web |url= http://www.bpf.co.uk/enviromental_matters/Life_of_a_PVC_U_Window.aspx |title= Life of a PVC-U window |publisher=British Plastics Federation |accessdate=3 July 2017}}</ref> 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{{citation needed|reason= Source required.  |date=August 2019}}. Vinyl sashes offer many benefits to the manufacturer and are generally the least expensive type of window for the consumer. The waterproof nature of [[uPVC]] and ease of installation are also benefits. Problems include durability. 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.<ref name="Building Code Decision">{{Cite web |url= http://www.mah.gov.on.ca/Page7945.aspx |title=Building Code Commission Decision |publisher= Ontario Ministry of Municipal Affairs |accessdate=3 July 2017}}</ref>
+[[uPVC]] or vinyl sash windows have become available since the first PVC window frames were being introduced in Germany in the 1960s.<ref name=Life>{{Cite web |url= http://www.bpf.co.uk/enviromental_matters/Life_of_a_PVC_U_Window.aspx |title= Life of a PVC-U window |publisher=British Plastics Federation |access-date=3 July 2017}}</ref> 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{{citation needed|reason= Source required.  |date=August 2019}}. 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.<ref name="Building Code Decision">{{Cite web |url= http://www.mah.gov.on.ca/Page7945.aspx |title=Building Code Commission Decision |publisher= Ontario Ministry of Municipal Affairs |access-date=3 July 2017}}</ref>
 ==See also==
@@ Line 44: / Line 45: @@
 ==External links==
 {{Wiktionary}}
-{{Commons category|Sash windows|Sash window}}
+{{Commons category|position=left|Sash windows|Sash window}}
-* [https://www.historicenvironment.scot/advice-and-support/your-property/saving-energy-in-traditional-buildings/sash-windows-how-to-reduce-heat-loss/ Historic Scotland's guide for energy-efficient sash windows]
-* [https://www.historicengland.org.uk/images-books/publications/thermal-performance-traditional-windows/ Research into the thermal performance of traditional sash windows]
-* [http://www.buildingconservation.com/articles/stillintheframe/sash_window_repair.htm How to repair and upgrade sash windows sympathetically]
-* [http://www.fixingscreens.com/window-sashes.html Common repairs for window sashes]
-* [https://www.gowercroft.co.uk/problem-slim-double-glazing-in-heritage-windows/ The problem with slim double glazing in Sash windows]
 {{DEFAULTSORT:Sash Window}}