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Timber framing (German:Fachwerkbauweise) and"post-and-beam" construction are traditional methods of building with heavytimbers, creating structures using squared-off and carefully fitted andjoined timbers with joints secured by large wooden pegs. If thestructural frame ofload-bearing timber is left exposed on the exterior of the building it may be referred to ashalf-timbered, and in many cases the infill between timbers will be used for decorative effect. The country most known for this kind of architecture is Germany, where timber-framed houses are spread all over the country.[1][2]
The method comes from working directly from logs and trees rather than pre-cutdimensional lumber.Hewing this withbroadaxes,adzes, anddraw knives and using hand-poweredbraces andaugers (brace and bit) and otherwoodworking tools, artisans or framers could gradually assemble a building.
Since this building method has been used for thousands of years in many parts of the world likeEurope[3] (Germany, France, Norway, Switzerland, etc.) andAsia,[4] many styles of historic framing have developed. These styles are often categorized by the type of foundation, walls, how and where the beams intersect, the use of curved timbers, and the roof framing details.
A simple timber frame made of straight vertical and horizontal pieces with a common rafter roof withoutpurlins. The termbox frame is not well defined and has been used for any kind of framing (with the usual exception ofcruck framing). The distinction presented here is that the roof load is carried by the exterior walls. Purlins are also found even in plain timber frames.
Acruck is a pair of crooked or curved timbers[5] which form abent (U.S.) or crossframe (UK); the individual timbers are each called a blade. More than 4,000 cruck frame buildings have been recorded in the UK. Several types of cruck frames are used; more information follows in English style below and at the main articleCruck.
Aisled frames have one or more rows of interior posts. These interior posts typically carry morestructural load than the posts in the exterior walls. This is the same concept of the aisle in church buildings, sometimes called ahall church, where the center aisle is technically called anave. However, a nave is often called an aisle, and three-aisledbarns are common in the U.S., theNetherlands, and Germany. Aisled buildings are wider than the simpler box-framed or cruck-framed buildings, and typically have purlins supporting the rafters. In northern Germany, this construction is known as variations of a Ständerhaus.
Half-timbering refers to a structure with a frame ofload-bearing timber, creating spaces between the timbers called panels (in GermanGefach orFächer = partitions), which are then filled-in with some kind of nonstructural material known asinfill. The frame is often left exposed on the exterior of the building.[6]
Gallery of infill types:
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The earliest known type of infill, calledopus craticum by the Romans, was awattle and daub type construction.[7]Opus craticum is now confusingly applied to a Roman stone/mortar infill as well. Similar methods to wattle and daub were also used and known by various names, such as clam staff and daub, cat-and-clay, ortorchis (French), to name only three.
Wattle and daub was the most common infill in ancient times. The sticks were not always technically wattlework (woven), but also individual sticks installed vertically, horizontally, or at an angle into holes or grooves in the framing. The coating of daub has many recipes, but generally was a mixture of clay and chalk with a binder such as grass or straw and water orurine.[8] When the manufacturing of bricks increased, brick infill replaced the less durable infills and became more common. Stone laid in mortar as an infill was used in areas where stone rubble and mortar were available.
Other infills includebousillage, firedbrick, unfired brick such asadobe ormudbrick, stones sometimes calledpierrotage, planks as in the Germanständerbohlenbau, timbers as inständerblockbau, or rarelycob without any wooden support.[9] The wall surfaces on the interior were often "ceiled" withwainscoting and plastered forwarmth and appearance.
Brick infill sometimes callednogging became the standard infill after the manufacturing of bricks made them more available and less expensive. Half-timbered walls may be covered by siding materials includingplaster,weatherboarding,tiles, or slate shingles.[10]
The infill may be covered by other materials, includingweatherboarding ortiles,[10] or left exposed. When left exposed, both the framing and infill were sometimes done in a decorative manner. Germany is famous for its decorative half-timbering and the figures sometimes have names and meanings. The decorative manner of half-timbering is promoted in Germany by theGerman Timber-Frame Road, several planned routes people can drive to see notable examples ofFachwerk buildings.
Gallery of some named figures and decorations:
The collection of elements in half timbering are sometimes given specific names:
According to Craven (2019),[11] the term:
was used informally to mean timber-framed construction in the Middle Ages. For economy, cylindrical logs were cut in half, so one log could be used for two (or more) posts. The shaved side was traditionally on the exterior and everyone knew it to be half the timber.
The term half-timbering is not as old as the German nameFachwerk or the French namecolombage, but it is the standard English name for this style. One of the first people to publish the term "half-timbered" wasMary Martha Sherwood (1775–1851), who employed it in her book,The Lady of the Manor, published in several volumes from 1823 to 1829. She uses the term picturesquely: "...passing through a gate in a quickset hedge, we arrived at the porch of an old half-timbered cottage, where an aged man and woman received us."[12] By 1842, half-timbered had found its way intoThe Encyclopedia of Architecture byJoseph Gwilt (1784–1863). Thisjuxtaposition of exposed timbered beams and infilled spaces created the distinctive "half-timbered", or occasionally termed, "Tudor" style, or "black-and-white".
The most ancient known half-timbered building is called the House ofopus craticum. It was buried by the eruption ofMount Vesuvius in 79 AD in Herculaneum, Italy.Opus craticum was mentioned byVitruvius in his books on architecture as a timber frame with wattlework infill.[13] However, the same term is used to describe timber frames with an infill of stone rubble laid in mortar the Romans calledopus incertum.[14]
A less common meaning of the term "half-timbered" is found in the fourth edition of John Henry Parker'sClassic Dictionary of Architecture (1873) which distinguishes full-timbered houses from half-timbered, with half-timber houses having a ground floor in stone[15] orlogs such as theKluge House which was a log cabin with a timber-framed second floor.
Traditional timber framing is the method of creating framed structures of heavy timber jointed together with various joints, commonly and originally withlap jointing, and then later peggedmortise and tenon joints.Diagonal bracing is used to prevent "racking", or movement of structural vertical beams or posts.[16]
Originally, German (and other) mastercarpenters wouldpeg the joints with allowance of about 1 inch (25 mm), enough room for the wood to move as it 'seasoned', then cut the pegs, and drive the beam home fully into its socket.[citation needed]
To cope with variable sizes and shapes of hewn (byadze or axe) and sawn timbers, two main carpentry methods were employed: scribe carpentry and square rule carpentry.
Scribing orcoping was used throughout Europe, especially from the 12th century to the 19th century, and subsequently imported to North America, where it was common into the early 19th century. In a scribe frame, timber sockets are fashioned or "tailor-made" to fit their corresponding timbers; thus, each timber piece must be numbered (or "scribed").
Square-rule carpentry was developed inNew England in the 18th century. It used housed joints in main timbers to allow for interchangeable braces and girts. Today, standardized timber sizing means that timber framing can be incorporated into mass-production methods as per the joinery industry, especially where timber is cut by precisioncomputer numerical control machinery.
A jetty is an upper floor which sometimes historically used a structural horizontal beam, supported on cantilevers, called abressummer or 'jetty bressummer' to bear the weight of the new wall, projecting outward from the preceding floor or storey.
In the city ofYork in the United Kingdom, the famous street known asThe Shambles exemplifies this, where jettied houses seem to almost touch above the street.
Historically, the timbers would have been hewn square using a felling axe and then surface-finished with abroadaxe. If required, smaller timbers were ripsawn from the hewn baulks using pitsaws or frame saws. Today, timbers are more commonly bandsawn, and the timbers may sometimes be machine-planed on all four sides.
The vertical timbers include:
The horizontal timbers include:
When jettying, horizontal elements can include:
The sloping timbers include:
Historically were two different systems of the position of posts and studs:
Ridge-post framing is a structurally simple and ancientpost and lintel framing where the posts extend all the way to the ridge beams. Germans call thisFirstsäule orHochstud.
In the 1930s a system of timber framing referred to as the "modern timber connector method"[17] was developed. It was characterized by the use of timber members assembled into trusses and other framing systems and fastened using various types of metal timber connectors. This type of timber construction was used for various building types including warehouses, factories, garages, barns, stores/markets, recreational buildings, barracks, bridges, and trestles.[18] The use of these structures was promoted because of their low construction costs, easy adaptability, and performance in fire as compared to unprotected steel truss construction.
During World War II, the United States Army Corps of Engineers and the Canadian Military Engineers undertook to construct airplane hangars using this timber construction system in order to conserve steel. Wood hangars were constructed throughout North America and employed various technologies includingbowstring,Warren, andPratt trusses,glued laminated arches, and lamella roof systems. Unique to this building type is the interlocking of the timber members of the roof trusses and supporting columns and their connection points. The timber members are held apart by "fillers" (blocks of timber). This leaves air spaces between the timber members which improves air circulation and drying around the members which improves resistance to moisture borne decay.
Timber members in this type of framing system were connected with ferrous timber connectors of various types. Loads between timber members were transmitted using split-rings (larger loads), toothed rings (lighter loads), or spiked grid connectors.[19] Split-ring connectors were metal rings sandwiched between adjacent timber members to connect them together. The rings were fit into circular grooves on in both timber members then the assembly was held together with through-bolts. The through-bolts only held the assembly together but were not load-carrying.[18] Shear plate connectors were used to transfer loads between timber members and metal. Shear plate connectors resembled large washers, deformed on the side facing the timber in order to grip it, and were through-fastened with long bolts or lengths of threaded rod. A leading manufacturer of these types of timber connectors was the Timber Engineering Company, or TECO, of Washington, DC. The proprietary name of their split-ring connectors was the "TECO Wedge-Fit".
Timber-framed structures differ from conventional wood-framed buildings in several ways. Timber framing uses fewer, larger wooden members, commonly timbers in the range of 15 to 30 cm (6 to 12 in), while common wood framing uses many more timbers with dimensions usually in the 5- to 25-cm (2- to 10-in) range. The methods of fastening the frame members also differ. In conventional framing, the members are joined usingnails or other mechanical fasteners, whereas timber framing uses the traditional mortise and tenon or more complex joints that are usually fastened using only wooden pegs.[citation needed] Modern complex structures and timber trusses often incorporate steel joinery such as gusset plates, for both structural and architectural purposes.
Recently, it has become common practice to enclose the timber structure entirely in manufactured panels such asstructural insulated panels (SIPs). Although the timbers can only be seen from inside the building when so enclosed, construction is less complex and insulation is greater than in traditional timber building. SIPs are "an insulating foam core sandwiched between two structural facings, typically oriented strand board" according to the Structural Insulated Panel Association.[20] SIPs reduce dependency on bracing and auxiliary members, because the panels span considerable distances and add rigidity to the basic timber frame.
An alternate construction method is with concrete flooring with extensive use of glass. This allows a solid construction combined with open architecture. Some firms have specialized in industrial prefabrication of such residential and light commercial structures such asHuf Haus aslow-energy houses or – dependent on location –zero-energy buildings.
Straw-bale construction is another alternative where straw bales are stacked for nonload-bearing infill with various finishes applied to the interior and exterior such as stucco and plaster. This appeals to the traditionalist and the environmentalist as this is using "found" materials to build.
Mudbricks also called adobe are sometimes used to fill in timber-frame structures. They can be made on site and offer exceptional fire resistance. Such buildings must be designed to accommodate the poor thermal insulating properties of mudbrick, however, and usually have deep eaves or a veranda on four sides for weather protection.
Timber design or wood design is a subcategory ofstructural engineering that focuses on the engineering of wood structures. Timber is classified by tree species (e.g., southern pine, douglas fir, etc.) and its strength is graded using numerous coefficients that correspond to the number of knots, the moisture content, the temperature, the grain direction, the number of holes, and other factors. There are design specifications for sawn lumber,glulam members, prefabricatedI-joists,composite lumber, and various connection types. In the United States, structural frames are then designed according to theAllowable Stress Design method or the Load Reduced Factor Design method (the latter being preferred).[21]
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The techniques used in timber framing date back toNeolithic times, and have been used in many parts of the world during various periods such as ancient Japan, continental Europe, and Neolithic Denmark, England, France,Germany, Spain, parts of theRoman Empire, and Scotland.[22] The timber-framing technique has historically been popular in climate zones which favour deciduoushardwood trees, such asoak. Its northernmost areas areBaltic countries and southern Sweden. Timber framing is rare in Russia, Finland, northern Sweden, and Norway, where tall and straight lumber, such as pine and spruce, is readily available andlog houses were favored, instead.
Half-timbered construction in the Northern European vernacular building style is characteristic of medieval and early modern Denmark, England, Germany, and parts of France and Switzerland, where timber was in good supply yet stone and associated skills to dress the stonework were in short supply. In half-timbered construction, timbers that wereriven (split) in half provided the complete skeletal framing of the building.
Europe is full of timber-framed structures dating back hundreds of years, including manors, castles, homes, and inns, whose architecture and techniques of construction have evolved over the centuries. In Asia, timber-framed structures are found, many of them temples.
Some Roman carpentry preserved inanoxic layers ofclay atRomano-Britishvilla sites demonstrate that sophisticated Romancarpentry had all the necessary techniques for this construction. The earliest surviving (French) half-timbered buildings date from the 12th century.[citation needed]
Important resources for the study and appreciation of historic building methods areopen-air museums.
Thetopping out ceremony is abuilders' rite, an ancient tradition thought to have originated in Scandinavia by 700 AD.[23] In the U.S., a bough or small tree is attached to the peak of the timber frame after the frame is complete as a celebration. Historically, it was common for the master carpenter to give a speech, make a toast, and then break the glass. In Northern Europe, a wreath made for the occasion is more commonly used rather than a bough. In Japan, the "ridge raising" is a religious ceremony called thejotoshiki.[24] In Germany, it is called theRichtfest.
Carpenters' marks are markings left on the timbers of wooden buildings during construction.
Many historic hand tools used by timber framers for thousands of years have similarities, but vary in shape. Electrically powered tools first became available in the 1920s in the U.S. and continue to evolve. See thelist of timber framing tools for basic descriptions and images of unusual tools (The list is incomplete at this time).
Some of the earliest known timber houses in Europe have been found inGreat Britain, dating toNeolithic times;Balbridie andFengate are some of the rare examples of these constructions.
Molded plaster ornamentation, pargetting[25] further enriched some EnglishTudor architecture houses. Half-timbering is characteristic of Englishvernacular architecture in East Anglia,[26] Warwickshire,[27][28] Worcestershire,[29] Herefordshire,[30][31] Shropshire,[32][33] and Cheshire,[34] where one of the most elaborate surviving English examples of half-timbered construction isLittle Moreton Hall.[35]
InSouth Yorkshire, the oldest timber house inSheffield, the "Bishops' House" (c. 1500), shows traditional half-timbered construction.
In theWeald ofKent and Sussex,[36] the half-timbered structure of theWealden hall house,[37] consisted of an openhall with bays on either side and oftenjettied upper floors.
Half-timbered construction traveled withBritish colonists to North America in the early 17th century but was soon abandoned inNew England and the mid-Atlantic colonies for clapboard facings (anEast Anglia tradition). The original English colonial settlements, such asPlymouth, Massachusetts andJamestown, Virginia had timber-framed buildings, rather than thelog cabins often associated with the American frontier.Living history programs demonstrating the building technique are available at both these locations.
One of the surviving streets lined with almost-touching houses is known asThe Shambles,York, and is a popular tourist attraction.
For Timber-framed houses in Wales see:Architecture of Wales
Historic timber-frame construction in England (and the rest of the United Kingdom) showed regional variation[38] which has been divided into the "eastern school", the "western school", and the "northern school", although the characteristic types of framing in these schools can be found in the other regions (except the northern school).[39] A characteristic of the eastern school isclose studding which is a half-timbering style of many studs spaced about the width of the studs apart (for example six-inch studs spaced six inches apart) until the middle of the 16th century and sometimes wider spacing after that time. Close studding was an elite style found mostly on expensive buildings. A principal style of the western school is the use of square panels of roughly equal size and decorative framing utilizing many shapes such aslozenges, stars, crosses,quatrefoils,cusps, and many other shapes.[39] The northern school sometimes used posts which landed on the foundation rather than on a sill beam, the sill joining to the sides of the posts and called an interrupted sill. Another northern style was to use close studding but in a herring-bone or chevron pattern.[39]
As houses were modified to cope with changing demands there sometimes were a combination of styles within a single timber-frame construction.[40] The major types of historic framing in England are'cruck frame',[40] box frame,[40] and aisled construction. From the box frame, more complex framed buildings such as the Wealden House and Jettied house developed.[citation needed]
The cruck frame design is among the earliest, and was[40] in use by the early 13th century, with its use continuing to the present day, although rarely after the 18th century.[40] Since the 18th century however, many existing cruck structures have been modified, with the original cruck framework becoming hidden.[citation needed] Aisled barns are of two or three aisled types, the oldest surviving aisled barn being the barley barn atCressing Temple[39] dated to 1205–1235.[41]
Jettying was introduced in the 13th century and continued to be used through the 16th century.[39]
Generally speaking, the size of timbers used in construction, and the quality of the workmanship reflect the wealth and status of their owners. Small cottages often used quite small cross-section timbers which would have been deemed unsuitable by others. Some of these small cottages also have a 'home-made' – even temporary – appearance. Many such example can be found in the English shires. Equally, some relatively small buildings can be seen to incorporate substantial timbers and excellent craftsmanship, reflecting the relative wealth and status of their original owners. Important resources for the study of historic building methods in the UK areopen-air museums.
It is often claimed that timber-framed buildings in Britain contain reused ships' timbers. This belief is dismissed by experts, who point out that curved timbers are rarely suitable, that salt is destructive to cellulose in the wood, and that ships' timbers are generally slight compared to cruck trusses.[42]
Elaborately half-timbered houses of the 13th through 18th centuries still remain inBourges,Tours,Troyes,Rouen,Thiers,Dinan,Rennes, and many other cities, except inProvence andCorsica. Timber framing in French is known colloquially aspan de bois and half-timbering ascolombage. Alsace is the region with the most timbered houses in France.
TheNormandy tradition features two techniques: frameworks were built of four evenly spaced regularly hewn timbers set into the ground (poteau en terre) or into a continuous wooden sill (poteau de sole) and mortised at the top into the plate. The openings were filled with many materials including mud and straw, wattle and daub, or horsehair and gypsum.[43]
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Germany has several styles of timber framing, but probably the greatest number of half-timbered buildings in the world are to be found in Germany and in Alsace (France). There are many small towns which escaped both war damage and modernisation and consist mainly, or even entirely, of half-timbered houses.
TheGerman Timber-Frame Road (Deutsche Fachwerkstraße) is a tourist route that connects towns with remarkablefachwerk. It is more than 2,000 km (1,200 mi) long, crossing Germany through the states ofLower Saxony,Saxony-Anhalt,Hesse,Thuringia,Bavaria, andBaden-Württemberg.[16][44]
Some of the more prominent towns (among many) include:Quedlinburg, aUNESCO-listed town, which has over 1200 half-timbered houses spanning five centuries;Goslar, another UNESCO-listed town;Hanau-Steinheim (home of theBrothers Grimm);Bad Urach;Eppingen ("Romance city" with a half-timbered church dating from 1320);Mosbach;Vaihingen an der Enz and nearby UNESCO-listedMaulbronn Abbey;Schorndorf (birthplace ofGottlieb Daimler);Calw;Celle; andBiberach an der Riß with both the largest medieval complex, theHoly Spirit Hospital and one of Southern Germany's oldest buildings, now theBraith-Mali-Museum, dated to 1318.
Germanfachwerk building styles are extremely varied with a huge number of carpentry techniques which are highly regionalized. German planning laws for the preservation of buildings and regional architecture preservation dictate that a half-timbered house must be authentic to regional or even city-specific designs before being accepted.[45][46]
A brief overview of styles follows, as a full inclusion of all styles is impossible.
In general the northern states havefachwerk similar to that of the nearby Netherlands and England while the more southerly states (most notablyBavaria and Switzerland) have more decoration using timber because of greater forest reserves in those areas. During the 19th century, a form of decorative timber-framing calledbundwerk became popular in Bavaria, Austria andSouth Tyrol.
The Germanfachwerkhaus usually has a foundation of stone, or sometimes brick, perhaps up to several feet (a couple of metres) high, which the timber framework is mortised into or, more rarely, supports an irregular wooden sill.
The three main forms may be divided geographically:
The most characteristic feature is the spacing between the posts and the high placement of windows. Panels are enclosed by asill,posts, and aplate, and are crossed by two rails between which the windows are placed—like "two eyes peering out".[45][46]
In addition there is a myriad of regional scrollwork and fretwork designs of the non-loadbearing large timbers (braces) peculiar to particularly wealthy towns or cities.
A unique type of timber-frame house can be found in the region where the borders of Germany, the Czech Republic, and Poland meet – it is called theUpper Lusatian house (Umgebindehaus, translates asround-framed house). This type has a timber frame surrounding a log structure on part of the ground floor.[citation needed]
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Several half-timbered houses can be found in Northern Italy, especially inPiedmont,Lombardy, in the city ofBologna, inSardinia in theBarbagia region and in the Iglesiente mining region.
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Historically, the majority of Polish cities as well as their central marketplaces possessed timber-framed dwellings and housing.[47] Throughout theMiddle Ages it was customary in Poland to use either bare brick orwattle and daub (Polish:szachulec) as filling in-between the timber frame.[47] However, the half-timbered houses which can be observed nowadays have been built in regions that were historically German or had significant German cultural influence. As these regions were at some point parts of GermanPrussia, half-timbered walls are often calledmur pruski (lit. Prussian wall) in Polish. A distinctive type of house associated with mostlyMennonite immigrant groups fromFrisia and the Netherlands, known as theOlędrzy, is called an "arcade house" (dom podcieniowy). The biggest timber-framed religious buildings in Europe are theChurches of Peace in southwestern Poland.[48] There are also numerous examples of timber-framed secular structures such as thegranaries inBydgoszcz.
TheUmgebindehaus rural housing tradition of southSaxony (Germany) is also found in the neighboring areas of Poland, particularly in theSilesian region.
Another world-class type of wooden building Poland shares with some neighboring countries are itswooden church buildings.
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The Spanish generally follow the Mediterranean forms of architecture with stone walls and shallow roof pitch. Timber framing is often of thepost and lintel style.Castile and León, par exampleLa Alberca, and theBasque Country have the most representative examples of the use of timber framing in the Iberian Peninsula.
Most traditional Basque buildings withhalf-timbering elements are detached farm houses (in Basque:baserriak). Their upper floors were built withjettied box frames inclose studding. In the oldest farmsteads and, if existing, in the third floor the walls were sometimes covered with verticalweatherboards. Big holes were left in the gable of the main façade for ventilation. The wooden beams were painted over, mostly in dark red. The vacancies were filled in withwattle and daub or rubble laid in a clay mortar and then plastered over with white chalk or nogged with bricks. Although the entire supporting structure is made of wood, the timbering is only visible on the main façade, which is generally oriented to the southeast.
Although the typical Basque house is now mostly associated with half-timbering, the outer walls and the fire-walls were built in masonry (rubble stone, bricks or, ideally,ashlars) whenever it could be afforded. Timber was a sign of poverty. Oak-wood was cheaper than masonry: that is why, when the money was running out, the upper floor walls were mostly built timbered. Extant baserriak with half-timbered upper-floor façades were built from the 15th to 19th centuries and are found in all Basque regions withoceanic climate, except inZuberoa (Soule), but are concentrated inLapurdi (Labourd).
Some medieval Basquetower houses (Dorretxe [eu]) feature an overhanged upper floor in half-timbering.
To a lesser extent timbered houses are also found in villages and towns asrow houses, as the photo from theUztaritz village shows.
Currently, it has again become popular to buildNéobasque [fr] houses resembling old Basque farmsteads, with more or less respect for the principles of traditional half-timbered building.
Switzerland has many styles of timber framing which overlap with its neighboring countries.
Nowadays, timber framing is primarily found in theprovinces ofLimburg,Liège, andLuxembourg. In urban areas, the ground floor was formerly built in stone and the upper floors in timber framing. Also, as timber framing was seen as a cheaper way of building, often the visible structures of noble houses were in stone and bricks, and the invisible or lateral walls in timber framing. The open-air museums ofBokrijk andSaint-Hubert (Fourneau Saint-Michel) show many examples of Belgian timber framing. Many post-and-beam houses can be found in cities and villages, but, unlike France, the United Kingdom, and Germany, there are few fully timber framed cityscapes.
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Timber frame (bindingsværk, literally "binding work") is the traditional building style in almost all of Denmark, making it the only Nordic country where this style is prevalent in all regions. Along the west coast of Jutland, houses built entirely of bricks were traditionally more common due to lack of suitable wood. In the 19th and especially in the 20th century, bricks have been the preferred building material in all of Denmark, but traditional timber-frame houses remain common both in the towns and in the countryside. Different regions have different traditions as to whether the timber frame should be tarred and thus clearly visible or be limewashed or painted in the same colour as the infills.
The Swedish mostly built log houses but they do have traditions of several types of timber framing: Some of the following links are written in Swedish. Most of the half-timbered houses in Sweden were built during the Danish time and are located in what until 1658 used to be Danish territory in southern Sweden, primarily in the provinceSkåne and secondarily inBlekinge andHalland. In Swedish half-timber is known askorsvirke.
Norway has at least two significant types of timber-framed structures: thestave church andGrindverk [no]. The termstave (a post or pole) indicates that astave church essentially means a framed church, a distinction made in a region wherelog building is common. All but one surviving stave churches are in Norway, one in Sweden. Replicas of stave churches and other Norwegian building types have been reproduced elsewhere, e.g. at theScandinavian Heritage Park inNorth Dakota, United States.
Grindverk translates astrestle construction, consisting of a series of transversal frames of two posts and a connecting beam, supporting two parallelwall plates bearing therafters. Unlike other types of timber framing in Europe, the trestle frame construction uses no mortise and tenon joints. Archaeological excavations have uncovered similar wooden joints from more than 3,000 years ago, suggesting that this type of framing is an ancient unbroken tradition. Grindverk buildings are only found on part of the western coast of Norway, and most of them are boathouses and barns.
Log building was the common construction used for housing humans andlivestock in Norway from theMiddle Ages until the 18th century. Timber framing of the type used in large parts of Europe appeared occasionally in late medieval towns, but never became common, except for the capitalChristiania. After a fire in 1624 in Oslo, KingChristian IV ordered the town to be relocated to a new site. He outlawed log building to prevent future conflagrations and required wealthy burghers to usebrickwork and the less affluent to use timber framing in the Danish manner. During the next two centuries, 50 per cent of the houses were timber framed.
All of these buildings disappeared as a consequence of this small provincial town of Christiania becoming the capital of independent Norway in 1814. This caused a rapid growth, with the population rising from 10 000 to 250 000 by 1900. Increasing prices caused a massiveurban renewal, which resulted in all wooden structures being replaced with office blocks.
The Netherlands is often overlooked for its timbered houses, yet many exist, including windmills. It was inNorth Holland where the import of cheaper timber, combined with the Dutch innovation ofwindmill-poweredsawmills, allowed economically viable widespread use of protective wood covering over framework. In the late 17th century the Dutch introduced verticalcladding also known in Eastern England as clasp board and in western England as weatherboard, then as more wood was available more cheaply, horizontal cladding in the 17th century. Perhaps owing to economic considerations, vertical cladding returned to fashion.[49] Dutch wall framing is virtually always built in bents and the three basic types of roof framing are the rafter roof, purlin roof, and ridge-post roof.[50]
Half-timbered houses can be found in Romania mostly in areas once inhabited byTransylvanian Saxons, in cities, towns and villages with Germanic influence such asBistrița,Brașov,Mediaș,Sibiu andSighișoara. However the number of half-timbered houses is small. InWallachia there are few examples of this type of architecture, most of those buildings being located inSinaia, such as thePeleș Castle.
As the result of centuries of German settlement and cultural influence, towns in the Baltic states such asKlaipėda andRiga also preserve German-style Fachwerkhäuser.
Most "haft-timbered" houses existing in Missouri, Pennsylvania, and Texas were built by German settlers.[43]Old Salem North Carolina has fine examples of German fachwerk buildings.[51]: 42–43 Many are still present inColonia Tovar (Venezuela),Santa Catarina andRio Grande do Sul (Brazil), where Germans settled. Later, they chose more suitable building materials for local conditions (most likely because of the great problem of tropical termites.)
In the historical region of North America known asNew France,colombage pierroté, also calledmaçonnerie entre poteaux,[52] half-timbered construction with the infill between the posts and studs of stone rubble and lime plaster orbousillage[52] and simply calledcolombage in France. Colombage was used from the earliest settlement until the 18th century but was known asbousillage entre poteaus sur solle inLower Louisiana. The style had its origins in Normandy, and was brought to Canada by early Norman settlers. The Men's House atLower Fort Garry is a good example. The exterior walls of such buildings were often covered over with clapboards to protect the infill from erosion. Naturally, this required frequent maintenance, and the style was abandoned as a building method in the 18th century in Québec. For the same reasons, half-timbering in New England, which was originally employed by the English settlers, fell out of favour soon after the colonies had become established.
Other variations of half-timbering arecolombage à teurques (torchis), straw coated with mud and hung over horizontal staves (or otherwise held in place), colombage an eclisses, and colombage a lattes.[52]
Poteaux-en-terre (posts in ground) is a type of timber framing with the many vertical posts or studs buried in the ground calledpost in ground or "earthfast" construction. The tops of the posts are joined to a beam and the spaces between are filled in with natural materials called bousillage orpierrotage.
Poteaux-sur-sol (posts on a sill) is a general term for any kind of framing on a sill. However, sometimes it specifically refers to "vertical log construction" like poteaux-en-terre placed on sills with the spaces between the timbers infilled.
Piece-sur-piece, also known asPost-and-plank style or "corner post construction" (and many other names) in which wood is used both for the frame and horizontal infill; for this reason it may be incorrect to call it "half-timbering". It is sometimes a blend of framing and log building with two styles: the horizontal pieces fit into groves in the posts and can slide up and down or the horizontal pieces fit into individual mortises in the posts and are pegged and the gaps between the pieces chinked (filled in with stones or chips of wood covered with mud or moss briefly discussed inLog cabin.)
This technique of a timber frame walls filled in with horizontal planks or logs proved better suited to the harsh climates of Québec and Acadia, which at the same time had abundant wood. It became popular throughout New France, as far afield as southern Louisiana. TheHudson's Bay Company used this technique for many of its trading posts, and this style of framing becoming known as Hudson Bay style or Hudson Bay corners. Also used by theRed River Colony this style also became known as "Red River Framing". "The support of horizontal timbers by corner posts is an old form of construction in Europe. It was apparently carried across much of the continent from Silesia by the Lausitz urnfield culture in the late Bronze Age."[53] Similar building techniques are apparently not found in France[51]: 121 but exist in Germany and Switzerland known asBohlenstanderbau when planks are used orblockstanderbau when beams are used as the infill. In Sweden the technique is known assleppvegg orskiftesverk and in Denmark asbulhus.
A particularly interesting example in the U.S. is theGolden Plough Tavern (c. 1741), York, York County, Pennsylvania, which has the ground level of corner-post construction with the second floor of fachwerk (half timbered) and was built for a German with other Germanic features.[54]
Settlers in New France also built horizontal log, brick, and stone buildings.
Characteristics of traditional timber framing in the parts of the U.S. formerly known asNew Netherland are H-framing also known as dropped-tie framing in the U.S. and the similar anchor beam framing as found in the New WorldDutch barn.
Some time periods/regions withinNew England contain certain framing elements such as commonpurlin roofs, five sided ridge beams, plank-frame construction and plank-wall construction. TheEnglish barn always contains an "English tying joint" and the laterNew England style barn were built usingbents.
Japanese timber framing is believed to be descended from Chinese framing (seeAncient Chinese wooden architecture). Asian framing is significantly different from western framing, with its predominant use ofpost and lintel framing and an almost complete lack of diagonal bracing.
When half-timbering regained popularity in Britain after 1860 in the various revival styles, such as theQueen Anne style houses byRichard Norman Shaw and others, it was often used to evoke a "Tudor" atmosphere (seeTudorbethan), though in Tudor times half-timbering had begun to look rustic and was increasingly limited to village houses (illustration, above left).
In 1912, Allen W. Jackson publishedThe Half-Timber House: Its Origin, Design, Modern Plan, and Construction, and rambling half-timbered beach houses appeared on dune-front properties inRhode Island or under palm-lined drives ofBeverly Hills. During the 1920s increasingly minimal gestures towards some half-timbering in commercial speculative housebuilding saw the fashion diminish.
In the revival styles, such asTudorbethan (Mock Tudor), the half-timbered appearance is superimposed on the brickwork or other material as an outside decorativefaçade rather than forming the main frame that supports the structure.
The style was used in many of the homes built inLake Mohawk, New Jersey, as well as all of the clubhouse, shops, and marina.
For information about "roundwood framing" see the bookRoundwood Timber Framing: Building Naturally Using Local Resources by Ben Law (East Meon, Hampshire: Permanent Publications; 2010.ISBN 1856230414)
The use of timber framing in buildings offers various aesthetic and structural benefits, as the timber frame lends itself to open plan designs and allows for complete enclosure in effective insulation for energy efficiency. In modern construction, a timber-frame structure offers many benefits:
In North America, heavy timber construction is classified Building Code Type IV: a special class reserved for timber framing which recognizes the inherent fire resistance of large timber and its ability to retain structural capacity in fire situations. In many cases this classification can eliminate the need and expense of fire sprinklers in public buildings.[58]
In terms of the traditional half-timber orfachwerkhaus there are maybe more disadvantages than advantages today. Such houses are notoriously expensive to maintain let alone renovate and restore, most commonly owing to local regulations that do not allow divergence from the original, modification or incorporation of modern materials.Additionally, in such nations as Germany, where energy efficiency is highly regulated, the renovated building may be required to meet modern energy efficiencies, if it is to be used as a residential or commercial structure (museums and significant historic buildings have no semi-permanent habitade exempt). Many framework houses of significance are treated merely to preserve, rather than render inhabitable – most especially as the required heavy insecticidal fumigation is highly poisonous.
In some cases, it is more economical to build anew using authentic techniques and correct period materials than restore. One major problem with older structures is the phenomenon known asmechano-sorptive creep or slanting: where wood beams absorb moisture whilst undercompression ortension strains and deform, shift position or both. This is a major structural issue as the house may deviate several degrees from perpendicular to its foundations (in the x-axis, y-axis, and even z-axis) and thus be unsafe and unstable or so out of square it is extremely costly to remedy.[59]
A summary of problems withFachwerkhäuser or half-timbered houses includes the following, though many can be avoided by thoughtful design and application of suitable paints and surface treatments and routine maintenance. Often, though when dealing with a structure of a century or more old, it is too late.[49]
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