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Hip roof

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A raised bungalow in Chicago with a hipped roof
A raised bungalow in Chicago with a hipped roof
A hip roof type house in Khammam city, India
A hip roof type house in Khammam city, India

A hip roof, hip-roof[1] or hipped roof, is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope (although a tented roof by definition is a hipped roof with steeply pitched slopes rising to a peak). Thus, a hipped roof has no gables or other vertical sides to the roof.

A square hip roof is shaped like a pyramid. Hip roofs on houses may have two triangular sides and two trapezoidal ones. A hip roof on a rectangular plan has four faces. They are almost always at the same pitch or slope, which makes them symmetrical about the centerlines. Hip roofs often have a consistent level fascia, meaning that a gutter can be fitted all around. Hip roofs often have dormer slanted sides.

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Roof

Roof

A roof is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. A roof is part of the building envelope.

Tented roof

Tented roof

A tented roof is a type of polygonal hipped roof with steeply pitched slopes rising to a peak. Tented roofs, a hallmark of medieval religious architecture, were widely used to cover churches with steep, conical roof structures.

Gable

Gable

A gable is the generally triangular portion of a wall between the edges of intersecting roof pitches. The shape of the gable and how it is detailed depends on the structural system used, which reflects climate, material availability, and aesthetic concerns. The term gable wall or gable end more commonly refers to the entire wall, including the gable and the wall below it. Some types of roof do not have a gable. One common type of roof with gables, the gable roof, is named after its prominent gables.

Pyramid

Pyramid

A pyramid is a structure whose outer surfaces are triangular and converge to a single step at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or of any polygon shape. As such, a pyramid has at least three outer triangular surfaces. The square pyramid, with a square base and four triangular outer surfaces, is a common version.

Fascia (architecture)

Fascia (architecture)

Fascia is an architectural term for a vertical frieze or band under a roof edge, or which forms the outer surface of a cornice, visible to an observer.

Dormer

Dormer

A dormer is a roofed structure, often containing a window, that projects vertically beyond the plane of a pitched roof. A dormer window is a form of roof window.

Construction

A hip roof construction in Northern Australia showing multinail truss construction. The blue pieces are roll-formed metal roof battens or purlins
A hip roof construction in Northern Australia showing multinail truss construction. The blue pieces are roll-formed metal roof battens or purlins
Common hip roof on a rectangular plan with pitches rising to a ridge.
Common hip roof on a rectangular plan with pitches rising to a ridge.
"Pavilion" hip roof on a square plan with pitches rising to a peak.
"Pavilion" hip roof on a square plan with pitches rising to a peak.

Hip roofs are more difficult to construct than a gabled roof, requiring more complex systems of rafters or trusses. Hip roofs can be constructed on a wide variety of plan shapes. Each ridge is central over the rectangle of the building below it. The triangular faces of the roof are called the hip ends, and they are bounded by the hips themselves. The "hips" and hip rafters sit on an external corner of the building and rise to the ridge. Where the building has an internal corner, a valley makes the join between the sloping surfaces (and is underlain by a valley rafter). Hip roofs have the advantage of giving a compact, solid appearance to a structure. The roof pitch (slope) may vary.

Use

In modern domestic architecture, hip roofs are commonly seen in bungalows and cottages, and have been integral to styles such as the American Foursquare. However, they have been used in many styles of architecture and in a wide array of structures.

Advantages and disadvantages

A hip roof on a varied plan, "h" denotes a hip, "v" denotes a valley
A hip roof on a varied plan, "h" denotes a hip, "v" denotes a valley

A hip roof is self-bracing, requiring less diagonal bracing than a gable roof. Hip roofs are thus much more resistant to wind damage than gable roofs. Hip roofs have no large, flat, or slab-sided ends to catch wind and are inherently much more stable than gable roofs. However, for a hurricane region, the roof also has to be steep-sloped; at least 35 degrees from horizontal or steeper in slope is preferred. When wind flows over a shallow sloped hip roof, the roof can behave like an airplane wing. Lift is then created on the leeward side. The flatter the roof, the more likely this will happen. A steeper pitched hip roof tends to cause the wind to stall as it goes over the roof, breaking up the effect. If the roof slopes are less than 35 degrees from horizontal, the roof will be subject to uplift. Greater than 35 degrees, and not only does wind blowing over it encounter a stalling effect, but the roof is actually held down on the wall plate by the wind pressure.

A disadvantage of a hip roof, compared with a gable roof on the same plan, is that there is less room inside the roof space; access is more difficult for maintenance; hip roofs are harder to ventilate; and there is not a gable with a window for natural light.[2][3] Elegant, organic additions are relatively difficult to make on houses with hip roofs.

Variants

Mansard roof

Mansard roof
Mansard roof

A mansard roof is a variation on a hip roof, with two different roof angles, the lower one much steeper than the upper.

Gablet roof or Dutch gable

Gablet roof
Gablet roof

Another variation is the gablet (UK terminology) or Dutch gable roof (U.S. and Australasian terminology), which has a hip with a small gable (the gablet) above it. This type simplifies the construction of the roof; no girder trusses are required, but it still has level walls and consistent eaves.

The East Asian hip-and-gable roof is similar in concept to the gablet roof.

Half-hip roof

Half-hip roof
Half-hip roof

A half-hip, clipped-gable or jerkin head roof has a gable, but the upper point of the gable is replaced by a small hip, squaring off the top of the gable. The lower edge of the half-hip may have a gutter which leads back on to the remainder of the roof on one or both sides. Both the gablet roof and the half-hipped roof are intermediate between the gabled and fully hipped types: the gablet roof has a gable above a hip, while a half-hipped roof has a hip above a gable.

Half-hipped roofs are very common in England, Denmark, Germany and especially in Austria and Slovenia. They are also typical of traditional timber-frame buildings in the Wealden area of South East England.

Half hip roofs are sometimes referred to as "Dutch hip", but this term is easily confused with "Dutch gable".

Pavilion roof

A roof with equally hipped pitches on a square or regular polygonal plan having a pyramidal or almost pyramidal form.[4] Low variants are typically found topping gazebos and other pavilion structures. Steep tower or church tower variants are known as pyramid roofs.

Rhenish helm or Helm roof

A pointed roof seen on a spire or a tower, oriented so that it has four gable ends. See the Church of St Mary the Blessed Virgin, Sompting in England, or Speyer Cathedral and Limburg Cathedral in Germany.

Tented roof

A tented roof is a type of polygonal hipped roof with steeply pitched slopes rising to a peak or intersection.

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Mansard roof

Mansard roof

A mansard or mansard roof is a multi-sided gambrel-style hip roof characterised by two slopes on each of its sides, with the lower slope at a steeper angle than the upper, and often punctured by dormer windows. The steep roofline and windows allow for additional floors of habitable space, and reduce the overall height of the roof for a given number of habitable storeys. The upper slope of the roof may not be visible from street level when viewed from close proximity to the building.

Eaves

Eaves

The eaves are the edges of the roof which overhang the face of a wall and, normally, project beyond the side of a building. The eaves form an overhang to throw water clear of the walls and may be highly decorated as part of an architectural style, such as the Chinese dougong bracket systems.

East Asian hip-and-gable roof

East Asian hip-and-gable roof

The East Asian hip-and-gable roof also known as 'resting hill roof', consists of a hip roof that slopes down on all four sides and integrates a gable on two opposing sides. It is usually constructed with two large sloping roof sections in the front and back respectively, while each of the two sides is usually constructed with a smaller roof section.

England

England

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

Denmark

Denmark

Denmark is a Nordic constituent country in Northern Europe. It is the most populous and politically central constituent of the Kingdom of Denmark, a constitutionally unitary state that includes the autonomous territories of the Faroe Islands and Greenland in the North Atlantic Ocean. Metropolitan Denmark is the southernmost of the Scandinavian countries, lying south-west and south of Sweden, south of Norway, and north of Germany, with which it shares a short land border, its only land border.

Germany

Germany

Germany, officially the Federal Republic of Germany, is a country in Central Europe. It is the second-most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated between the Baltic and North seas to the north, and the Alps to the south; it covers an area of 357,022 square kilometres (137,847 sq mi), with a population of over 84 million within its 16 constituent states. Germany borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr.

Austria

Austria

Austria, formally the Republic of Austria, is a landlocked country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous city and state. Austria is bordered by Germany to the northwest, the Czech Republic to the north, Slovakia to the northeast, Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west. The country occupies an area of 83,871 km2 (32,383 sq mi) and has a population of 9 million.

Regular polygon

Regular polygon

In Euclidean geometry, a regular polygon is a polygon that is direct equiangular and equilateral. Regular polygons may be either convex, star or skew. In the limit, a sequence of regular polygons with an increasing number of sides approximates a circle, if the perimeter or area is fixed, or a regular apeirogon, if the edge length is fixed.

Gazebo

Gazebo

A gazebo is a pavilion structure, sometimes octagonal or turret-shaped, often built in a park, garden or spacious public area. Some are used on occasions as bandstands.

Pavilion

Pavilion

In architecture, pavilion has several meanings:It may be a subsidiary building that is either positioned separately or as an attachment to a main building. Often it is associated with pleasure. In palaces and traditional mansions of Asia, there may be pavilions that are either freestanding or connected by covered walkways, as in the Forbidden City, Topkapi Palace in Istanbul, and in Mughal buildings like the Red Fort. As part of a large palace, pavilions may be symmetrically placed building blocks that flank a main building block or the outer ends of wings extending from both sides of a central building block, the corps de logis. Such configurations provide an emphatic visual termination to the composition of a large building, akin to bookends.

Church of St Mary the Blessed Virgin, Sompting

Church of St Mary the Blessed Virgin, Sompting

The Church of St Mary the Blessed Virgin, also known as St Mary the Virgin Church and St Mary's Church, is the Church of England parish church of Sompting in the Adur district of West Sussex. It stands on a rural lane north of the urban area that now surrounds the village, and retains much 11th- and 12th-century structure. Its most important architectural feature is the Saxon tower topped by a Rhenish helm, a four-sided pyramid-style gabled cap that is uncommon in England. English Heritage lists the church at Grade I for its architecture and history.

Limburg Cathedral

Limburg Cathedral

Limburg Cathedral (German: Limburger Dom, also known as Georgsdom after its dedication to Saint George, is located above the old town of Limburg in Hesse, Germany. It is the cathedral of the Catholic Diocese of Limburg. Its high location on a rock above the river Lahn provides its visibility from far away. It is the result of an Early Gothic modernization of an originally Early Romanesque building and therefore shows a Romanesque-Gothic transitional style.

Source: "Hip roof", Wikipedia, Wikimedia Foundation, (2022, October 27th), https://en.wikipedia.org/wiki/Hip_roof.

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References
  1. ^ Curl, James Stevens (2006). Oxford Dictionary of Architecture and Landscape Architecture, 2nd ed., OUP, Oxford and New York, p. 364. ISBN 978-0-19-860678-9.
  2. ^ "Design and Construction Guidance for Community Safe Rooms". FEMA. Archived from the original on 13 June 2013. Retrieved 8 April 2013.
  3. ^ Grazulis, Thomas P. (1993). Significant tornadoes, 1680-1991. St. Johnsbury, Vt.: Environmental Films. p. 106. ISBN 1-879362-03-1.
  4. ^ "Pavilion roof". A Dictionary of Construction, Surveying and Civil Engineering. Oxford University Press. 18 April 2013. ISBN 978-0-19-953446-3.
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