A hammerbeam roof is a decorative, open timber roof truss typical of English Gothic architecture and has been called "...the most spectacular endeavour of the English Medieval carpenter". [1] They are traditionally timber framed, using short beams projecting from the wall on which the rafters land, essentially a tie beam which has the middle cut out. These short beams are called hammer-beams [2] and give this truss its name. A hammerbeam roof can have a single, double or false hammerbeam truss.
A hammer-beam is a form of timber roof truss, allowing a hammerbeam roof to span greater than the length of any individual piece of timber. In place of a normal tie beam spanning the entire width of the roof, short beams – the hammer beams – are supported by curved braces from the wall, and hammer posts or arch-braces are built on top to support the rafters and typically a collar beam. The hammerbeam truss exerts considerable thrust on the walls or posts that support it. [3] Hammerbeam roofs can be highly decorated including ornamented pendants and corbels, with church roofs often including carved angels.
A roof with one pair of hammer beams is a single hammerbeam roof. Some roofs have a second pair of hammer beams and are called double hammerbeam roofs (truss).
A false hammerbeam roof (truss) has two definitions:
Possibly the earliest hammer-beamed building still standing in England, built in about 1310 [8] and located in Winchester Cathedral Close, is the Pilgrims' Hall, now part of The Pilgrims' School.
The roof of Westminster Hall (1395–1399) is a fine example of a hammerbeam roof. The span of Westminster Hall is 20.8 metres (68 ft. 4 in.), and the opening between the ends of the hammer beams 7.77 metres (25 ft. 6 in). The height from the paving of the hall to the hammerbeam is 12.19 m (40 ft.), and to the underside of the collar beam 19.35 metres (63 ft. 6 in.), so that an additional height in the centre of 7.16 m (23 ft. 6 in.) has been gained. In order to give greater strength to the framing, a large arched piece of timber is carried across the hall, rising from the bottom of the wall piece to the centre of the collar beam, the latter also supported by curved braces rising from the end of the hammerbeam. [9]
Other important examples of hammerbeam roofs exist over the halls of Hampton Court and Eltham palaces, and Burghley House near Stamford. There are also numerous examples of smaller dimensions in churches throughout England, particularly in the eastern counties. The ends of the hammerbeams are usually decorated with winged angels holding shields; the curved braces and beams are richly moulded, and the spandrels in the larger examples filled in with tracery, as can be seen in Westminster Hall. Sometimes, but rarely, the collar beam is similarly treated, or cut through and supported by additional curved braces, as in the hall of the Middle Temple, London. [9]
Recently, as part of an extensive restoration project undertaken by Historic Scotland, the hammerbeam roof of the Great Hall at Stirling Castle was completely restored. Green oak from 350 Perthshire trees was used to fabricate and erect 57 hammerbeam trusses spanning approximately 15 metres. Since its construction around 1502 by King James IV of Scotland, structural loads from the roof had caused the walls of the hall to deflect outwards. To ensure that the ridge of the roof would be level and straight, the trusses were each made with a slightly different pitch and span. The restoration started in 1991 and was completed in 1999. [10]
Other examples are in the Parliament Hall in Edinburgh, the Great Hall in Edinburgh Castle, the chapel of New College, Oxford, the Great Hall of Athelhampton House, Dorchester, Dorset the Great Hall of Darnaway Castle in Moray, and the Great Hall of Dartington Hall, Totnes.
A spectacular modern example of a hammer-beam roof is the new Gothic roof of St George's Hall at Windsor Castle, designed by Giles Downe and completed in 1997. This replaced the previous flatter roof which was destroyed in the 1992 Windsor Castle fire.
It is incorrectly believed by some that the widest hammerbeam roof in England at 72 ft (22 m) wide is in the train shed at Bristol Temple Meads railway station by Isambard Kingdom Brunel . [11] In fact, the station roof uses modern cantilever construction; the hammerbeam style elements are purely decorative. The hammer posts and brackets support nothing, as all the weight of the roof is braced and supported by the massive side walls via the main timber ribs of the roof and the pillars inside the train shed. [12]
Timber framing and "post-and-beam" construction are traditional methods of building with heavy timbers, creating structures using squared-off and carefully fitted and joined timbers with joints secured by large wooden pegs. If the structural frame of load-bearing timber is left exposed on the exterior of the building it may be referred to as half-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.
A rafter is one of a series of sloped structural members such as steel beams that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof shingles, roof deck, roof covering and its associated loads. A pair of rafters is called a couple. In home construction, rafters are normally made of wood. Exposed rafters are a feature of some traditional roof styles.
A cruck or crook frame is a curved timber, one of a pair, which support the roof of a building, historically used in England and Wales. This type of timber framing consists of long, generally naturally curved, timber members that lean inwards and form the ridge of the roof. These posts are then generally secured by a horizontal beam which then forms an "A" shape. Several of these "crooks" are constructed on the ground and then lifted into position. They are then joined together by either solid walls or cross beams which aid in preventing 'racking'.
Framing, in construction, is the fitting together of pieces to give a structure support and shape. Framing materials are usually wood, engineered wood, or structural steel. The alternative to framed construction is generally called mass wall construction, where horizontal layers of stacked materials such as log building, masonry, rammed earth, adobe, etc. are used without framing.
A purlin is a longitudinal, horizontal, structural member in a roof. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin, and common purlin.
Domestic roof construction is the framing and roof covering which is found on most detached houses in cold and temperate climates. Such roofs are built with mostly timber, take a number of different shapes, and are covered with a variety of materials.
The Great Hall of the University of Sydney, is one of the principal structures of The University of Sydney, New South Wales, Australia, with a public interior used for formal ceremonies, conferences, recitals and dinners. The Hall, located in the Main Quadrangle on the Camperdown campus, is a symbol of the university's stately history and an excellent example of Victorian Academic Gothic revival architecture. Completed in July 1859, the Great Hall soon became a tourist attraction; the writer Anthony Trollope wrote home in 1874 that the Hall was "the finest chamber in the colonies", and that no college of Oxford or Cambridge possessed a hall "of which the proportions are so good".
In architecture, a vault is a self-supporting arched form, usually of stone or brick, serving to cover a space with a ceiling or roof. As in building an arch, a temporary support is needed while rings of voussoirs are constructed and the rings placed in position. Until the topmost voussoir, the keystone, is positioned, the vault is not self-supporting. Where timber is easily obtained, this temporary support is provided by centering consisting of a framed truss with a semicircular or segmental head, which supports the voussoirs until the ring of the whole arch is completed.
A king post is a central vertical post used in architectural or bridge designs, working in tension to support a beam below from a truss apex above.
A collar beam or collar is a horizontal member between two rafters and is very common in domestic roof construction. Often a collar is structural but they may be used simply to frame a ceiling. A collar beam is often called a collar tie but this is rarely correct. A tie in building construction is an element in tension rather than compression and most collar beams are designed to work in compression to keep the rafters from sagging. A collar near the bottom of the rafters may replace a tie beam and be designed to keep the rafters from spreading, thus are in tension: these are correctly called a collar tie.
English Gothic is an architectural style that flourished from the late 12th until the mid-17th century. The style was most prominently used in the construction of cathedrals and churches. Gothic architecture's defining features are pointed arches, rib vaults, buttresses, and extensive use of stained glass. Combined, these features allowed the creation of buildings of unprecedented height and grandeur, filled with light from large stained glass windows. Important examples include Westminster Abbey, Canterbury Cathedral and Salisbury Cathedral. The Gothic style endured in England much longer than in Continental Europe.
The history of construction embraces many other fields, including structural engineering, civil engineering, city growth and population growth, which are relatives to branches of technology, science, history, and architecture. The fields allow both modern and ancient construction to be analyzed, as well as the structures, building materials, and tools used.
Charles Jones was Ealing's first architect, engineer and surveyor. He held these posts for fifty years, and is known for his work on civic buildings.
A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between each truss is known as a bay.
A post is a main vertical or leaning support in a structure similar to a column or pillar but the term post generally refers to a timber but may be metal or stone. A stud in wooden or metal building construction is similar but lighter duty than a post and a strut may be similar to a stud or act as a brace. In the U.K. a strut may be very similar to a post but not carry a beam. In wood construction posts normally land on a sill, but in rare types of buildings the post may continue through to the foundation called an interrupted sill or into the ground called earthfast, post in ground, or posthole construction. A post is also a fundamental element in a fence. The terms "jack" and "cripple" are used with shortened studs and rafters but not posts, except in the specialized vocabulary of shoring.
The hall house is a type of vernacular house traditional in many parts of England, Wales, Ireland and lowland Scotland, as well as northern Europe, during the Middle Ages, centring on a hall. Usually timber-framed, some high status examples were built in stone.
A balloon flange girder or (colloquially) balloon topper is a form of vertical I-beam wrought iron plate girder, where the top flange, instead of being a simple flat plate, is extended into a hollow tube. When a girder is subjected to a positive bending moment the top flange acts in compression making a flat plate flange more susceptible to local buckling than the balloon flange is.
Whitefriar or Akrill's Court is a 16th century timber-framed building in Lincoln. It now has a late 20th century shop front, but the timber-framed building survives with the southern front facing the narrow Akrill’s passage, on the east side of the High Street and just to the south of the railway crossing.
The Priest House is a Grade II* listed fifteenth century timber framed hall house in the centre of West Hoathly, in West Sussex, England. It is close to The Cat Inn and St Margaret's Church. It is now a museum, open to the public six days a week from March to October.
British industrial architecture has been created, mainly from 1700 onwards, to house industries of many kinds in Britain, home of the Industrial Revolution in this period. Both the new industrial technologies and industrial architecture soon spread worldwide. As such, the architecture of surviving industrial buildings records part of the history of the modern world.
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