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the jetty beams or joists which conform to the greater dimensions of the floor above but rest at right angles on the jetty-plates that conform to the shorter dimensions of the floor below. The jetty beams are morticed at 45° into the sides of the dragon beams. They are the main constituents of the
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Jettying was used for timber-framed buildings, but was succeeded by cantilever which are used for the same reason as jettying, to maximise space in buildings. This is often utilised on buildings which are on a narrow plot and space is at a premium.
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buildings in which an upper floor projects beyond the dimensions of the floor below. This has the advantage of increasing the available space in the building without obstructing the street. Jettied floors are also termed
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Jetties were popular in the 16th century but banned in Rouen in 1520 relating to air circulation and the plague, and London in 1667 relating to the great fire. They are considered a Gothic style.
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the more massive corner posts of the timber frame that support the dragon beam from the floor below and are supported in their turn by the dragon beam for the extended floor above.
473:
Ensminger, Robert F.. "Origin." The
Pennsylvania barn: its origin, evolution, and distribution in North America. 2nd ed. Baltimore: Johns Hopkins University Press, 2003.
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Noble, Allen George, and M. Margaret Geib. Wood, brick, and stone: the North
American settlement landscape. Amherst: University of Massachusetts Press, 1984. 22.
192:
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Davies, Nikolas, and Erkki
Jokiniemi. Dictionary of architecture and building construction. Amsterdam: Elsevier/Architectural Press, 2008. 144. false jetty.
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the jetty breastsummer (or bressummer), the sill on which the projecting wall above rests; the bressummer stretches across the whole width of the jetty wall
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the dragon-beam which runs diagonally from one corner to another, and supports the corner posts above and is supported in turn by the corner posts below
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system in which a horizontal beam, the jetty bressummer, supports the wall above and projects forward beyond the floor below (a technique also called
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The under-side of jetties in
Germany are sometimes decorated and called a windbrett (wind board). This is an example of a jetty supported on brackets.
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the jetty-plates, designed to carry the jetty-beams or joints. The jetty-plate itself is supported by the corner posts of the recessed floor below.
425:
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Garvan, Anthony N. B., Architecture and Town
Planning in Colonial Connectucut (New Haven: Yale University Press, 1957. 92.
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uses shorter timbers, a benefit due to timber shortages and difficult handling of long timbers especially in city streets.
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hewn jetty also called a false jetty: Framed on projections of the posts rather than on cantilevered beams (or brackets).
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the structural advantage of the jettied wall counteracting forces in the joists or tying a stone wall together
336:– modern buildings still use cantilevered floors, but the term jettying is rarely used. See for example
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Harris, Richard. Discovering timber-framed buildings. 2d ed. Aylesbury: Shire
Publications, 1979. 55–57.
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which are supported by jetty plates. Jetty joists in their turn were slotted sideways into the diagonal
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http://archaeologydataservice.ac.uk/catalogue/adsdata/arch-769-1/dissemination/pdf/vol17/17_100_125.pdf
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Harris, Richard. Discovering timber-framed buildings. 2d ed. Aylesbury: Shire
Publications, 1979. 56.
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house. Most jetties are external, but some early medieval houses were built with internal jetties.
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The origins of jettying are unclear but some reasons put forward for their purpose are:
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Alcock, N. A., Michael
Laithwaite. "Medieval Houses in Devon and Their Modernization".
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Boston, Massachusetts, US, built 1680. This is framed on a few cantilevered beams.
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This article is about the building technique. For the marine structures, see
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The overhanging corner posts are often reinforced by curved jetty brackets.
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in the U.S. has a distinctive cantilever called a forebay, not a jetty.
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488:. Council for British Archaeology, Practical Handbook in Archaeology.
111:(or breastsummer) itself rests on the ends of a row of jetty beams or
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often featured jetties. Contemporary examples still survive in the
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and may be decoratively carved; Prieuré de Saint-Arnoult, France
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cantilever system and they determine how far the jetty projects
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Alcock, N.W.; Barley, M.w.; Dixon, P.W.; Meeson, R.A. (1996).
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to shelter the lower walls of the house from the weather.
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The vertical elements of jetties can be summarized as:
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joists supporting the upper floors can easily be seen.
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373:Oxford English Dictionary, 2nd ed. 1989. Jetty
155:Structurally, jetties are of several types:
99:A jetty is an upper floor that depends on a
215:along the walls above and below the jetty.
75:. In the U.S., the most common surviving
236:The horizontal elements of jetties are:
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298:or supported overhang called a cumba.
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356:, brackets that may be under a jetty
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148:as a "symbol of wealth and status."
45:building. The ends of the multiple
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63:) is a building technique used in
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486:Recording Timber-Framed Buildings
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383:Illustration of a jettied house
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324:, has a supported cantilever.
320:, built before AD 79 in Roman
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228:Jetties in French are called
119:at angle of 45° by means of
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27:Medieval building technique
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305:, houses in medieval city
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159:framed on multiple joists.
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424:vol. 17 (1973), 100–125.
395:"Developments: Jettying"
349:Overhang (architecture)
520:Architectural elements
401:on September 22, 2021.
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162:framed on a few beams.
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525:Medieval architecture
301:In the North African
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207:the less substantial
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422:Medieval Archaeology
142:to simplify joinery.
56:(jetty, jutty, from
428:accessed 01/08/2013
220:Horizontal elements
169:added to the posts.
338:945 Madison Avenue
282:Mediterranean area
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311:Casbah of Algiers
276:Pennsylvania barn
186:Paul Revere House
177:Vertical elements
121:mortise and tenon
41:A double jettied
16:(Redirected from
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344:Machicolation
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318:Opus Craticum
316:The House of
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117:dragon beams
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68:timber-frame
61:getee, jette
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47:cantilevered
322:Herculaneum
290:house is a
105:oversailing
509:Categories
361:References
334:Cantilever
261:Cantilever
255:Cantilever
165:framed on
109:bressummer
101:cantilever
58:Old French
87:Structure
328:See also
167:brackets
123:joints.
81:garrison
65:medieval
54:Jettying
354:Corbels
307:kasbahs
303:Maghreb
288:Turkish
270:Forebay
211:of the
107:). The
73:jetties
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113:joists
209:studs
32:jetty
490:ISBN
274:The
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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