![pub](https://upload.wikimedia.org/wikipedia/commons/8/81/Pub.williams.arp.750pix.jpg)
Thatching is the craft of building a
roof
A roof ( : roofs or rooves) 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 temper ...
with dry vegetation such as
straw
Straw is an agricultural byproduct consisting of the dry stalks of cereal plants after the grain and chaff have been removed. It makes up about half of the yield of cereal crops such as barley, oats, rice, rye and wheat. It has a number ...
,
water reed
Reed is a common name for several tall, grass-like plants of wetlands.
Varieties
They are all members of the order Poales (in the modern, expanded circumscription), and include:
In the grass family, Poaceae
* Common reed (''Phragmites austral ...
,
sedge
The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' wit ...
(''
Cladium mariscus
''Cladium mariscus'' is a species of flowering plant in the Cyperaceae, sedge family known by the common names swamp sawgrass, great fen-sedge, saw-sedge or sawtooth sedge. Previously it was known as elk sedge. It is native of temperate Europe an ...
''),
rushes,
heather, or
palm branch
The palm branch is a symbol of victory, triumph, peace, and eternal life originating in the ancient Near East and Mediterranean world. The palm ''(Phoenix)'' was sacred in Mesopotamian religions, and in ancient Egypt represented immortality. In ...
es, layering the vegetation so as to shed water away from the inner roof. Since the bulk of the vegetation stays dry and is densely packed—trapping air—thatching also functions as
insulation
Insulation may refer to:
Thermal
* Thermal insulation, use of materials to reduce rates of heat transfer
** List of insulation materials
** Building insulation, thermal insulation added to buildings for comfort and energy efficiency
*** Insulated ...
. It is a very old roofing method and has been used in both
tropical
The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in
the Southern Hemisphere at S. The tropics are also referred to ...
and
temperate climates
In geography, the temperate climates of Earth occur in the middle latitudes (23.5° to 66.5° N/S of Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ranges throughout t ...
. Thatch is still employed by builders in developing countries, usually with low-cost local vegetation. By contrast, in some developed countries it is the choice of some affluent people who desire a rustic look for their home, would like a more ecologically friendly roof, or who have purchased an originally thatched abode.
History
Thatching methods have traditionally been passed down from generation to generation, and numerous descriptions of the materials and methods used in
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...
over the past three centuries survive in archives and early publications.
In some equatorial countries, thatch is the prevalent local material for
roof
A roof ( : roofs or rooves) 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 temper ...
s, and often
wall
A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including:
* Walls in buildings that form a fundamental part of the supe ...
s. There are diverse building techniques from the
ancient Hawaiian
Ancient Hawaii is the period of Hawaiian history preceding the unification in 1810 of the Kingdom of Hawaii by Kamehameha the Great. Traditionally, researchers estimated the first settlement of the Hawaiian islands as having occurred sporadicall ...
''hale'' shelter made from the local
ti leaves (''Cordyline fruticosa''),
lauhala ''Lauhala'', ''lau'' meaning "leaf" in the Hawaiian language, refers to the leaves of the hala tree ''(Pandanus tectorius)''.
Uses
The hala tree is of great cultural, health and economic importance in many Pacific Islands. The fruit of the tree i ...
(''Pandanus tectorius'') or
pili grass (''Heteropogon contortus'').
![PrayerAtBesakih](https://upload.wikimedia.org/wikipedia/commons/f/fb/PrayerAtBesakih.jpg)
Palm leaves are also often used. For example, in Na Bure,
Fiji
Fiji ( , ,; fj, Viti, ; Fiji Hindi: फ़िजी, ''Fijī''), officially the Republic of Fiji, is an island country in Melanesia, part of Oceania in the South Pacific Ocean. It lies about north-northeast of New Zealand. Fiji consists ...
, thatchers combine fan palm leaf roofs with layered reed walls. Feathered palm leaf roofs are used in Dominica.
Alang-alang (''Imperata cylindrica'') thatched roofs are used in Hawaii and
Bali
Bali () is a province of Indonesia and the westernmost of the Lesser Sunda Islands. East of Java and west of Lombok, the province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan, and Nu ...
. In Southeast Asia, mangrove
nipa palm
''Nypa fruticans'', commonly known as the nipa palm (or simply nipa, from ms, nipah) or mangrove palm, is a species of palm native to the coastlines and estuarine habitats of the Indian and Pacific Oceans. It is the only palm considered adapte ...
leaves are used as thatched roof material known as
attap dwelling
An attap dwelling is traditional housing found in the kampongs of Brunei, Indonesia, Malaysia and Singapore. Named after the attap palm, which provides the wattle for the walls, and the leaves with which their roofs are thatched, these dwelling ...
. In Bali,
Indonesia
Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
, the black fibres of the
sugar palm Sugar palm is a common name for several species of palms used to produce sugar.
:Species used include:
*''Arenga pinnata'' (syn. ''A. saccharifera'')
*''Borassus flabellifer''
*''Caryota''
:*'' Caryota urens''
*''Cocos nucifera''
See also
*Toddy ...
, called ''ijuk'', is also used as thatching material, usually in
temple
A temple (from the Latin ) is a building reserved for spiritual rituals and activities such as prayer and sacrifice. Religions which erect temples include Christianity (whose temples are typically called churches), Hinduism (whose temples ...
roofs and meru towers.
Sugar cane
Sugarcane or sugar cane is a species of (often hybrid) tall, perennial grass (in the genus ''Saccharum'', tribe Andropogoneae) that is used for sugar production. The plants are 2–6 m (6–20 ft) tall with stout, jointed, fibrous stalks t ...
leaf roofs are used in Kikuyu tribal homes in
Kenya
)
, national_anthem = "Ee Mungu Nguvu Yetu"()
, image_map =
, map_caption =
, image_map2 =
, capital = Nairobi
, coordinates =
, largest_city = Nairobi
, ...
.
Wild vegetation such as water reed (''Phragmites australis''),
bulrush
Bulrush is a vernacular name for several large wetland grass-like plants
*Sedge family (Cyperaceae):
**''Cyperus''
**''Scirpus''
**'' Blysmus''
**''Bolboschoenus''
**''Scirpoides''
**''Isolepis''
**''Schoenoplectus''
**''Trichophorum''
*Typhacea ...
/cat tail (''Typha'' spp.), broom (''Cytisus scoparius''), heather (''Calluna vulgaris''), and rushes (''Juncus'' spp. and ''Schoenoplectus lacustris'') was probably used to cover shelters and primitive dwellings in Europe in the late Palaeolithic period, but so far no direct archaeological evidence for this has been recovered. People probably began to use straw in the Neolithic period when they first grew cereals—but once again, no direct archaeological evidence of straw for thatching in Europe prior to the early medieval period survives.
Many
indigenous people of the Americas
The Indigenous peoples of the Americas are the inhabitants of the Americas before the arrival of the European settlers in the 15th century, and the ethnic groups who now identify themselves with those peoples.
Many Indigenous peoples of the Ame ...
, such as the former Maya civilization, Mesoamerica, the Inca empire, and the Triple Alliance (Aztec), lived in thatched buildings. It is common to spot thatched buildings in rural areas of the Yucatán Peninsula as well as many settlements in other parts of Latin America, which closely resemble the method of construction from distant ancestors. The first Americans encountered by Europeans lived in structures roofed with bark or skin set in panels that could be added or removed for ventilation, heating, and cooling. Evidence of the many complex buildings with fiber-based roofing material was not rediscovered until the early 2000s. French and British settlers built temporary thatched dwellings with local vegetation as soon as they arrived in New France and New England, but covered more permanent houses with wooden shingles.
In most of England, thatch remained the only roofing material available to the bulk of the population in the countryside, in many towns and villages, until the late 1800s.
[.] Commercial distribution of Welsh slate began in 1820, and the mobility provided by
canals
Canals or artificial waterways are waterways or river engineering, engineered channel (geography), channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport watercraft, vehicles (e.g. ...
and then
railways
Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...
made other materials readily available. Still, the number of thatched properties actually increased in the UK during the mid-1800s as agriculture expanded, but then declined again at the end of the 19th century because of agricultural recession and rural depopulation. A 2013 report estimated that there were 60,000 properties in the UK with a thatched roof; they are usually made of long straw, combed wheat reed or water reed.
Gradually, thatch became a mark of poverty, and the number of thatched properties gradually declined, as did the number of professional thatchers. Thatch has become much more popular in the UK over the past 30 years, and is now a symbol of wealth rather than poverty. There are approximately 1,000 full-time thatchers at work in the UK, and thatching is becoming popular again because of the renewed interest in preserving historic buildings and using more sustainable building materials.
File:Darß.6.JPG, Thatch works on a house in Mecklenburg, 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 betwe ...
File:Born.Zingst.1.JPG, Fishermen's Church in Born auf dem Darß
Born auf dem Darß is a municipality in the Vorpommern-Rügen district, in Mecklenburg-Western Pomerania, Germany. It is part of the peninsula Darß, to which also belong the villages of Prerow and Wieck. Born is situated at the southern shore of ...
municipality, Germany
File:Thatched cottage in the sand dunes by Denmark.jpg, Thatched cottages in the sand dunes
A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, fl ...
, Denmark
File:Ireland Victor Grigas 2011-29.jpg, Thatched roof house in Kilmore Quay
Kilmore Quay () is a fishing village near Kilmore, in County Wexford, Ireland. As of 2016, it has a population of 372. It is a fishing village, but its leisure facilities such as sailing, and sea angling charters are also of economic importanc ...
, Ireland
Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...
File:Cahire.JPG, Cahire Breton cottages at Plougoumelen
Plougoumelen () is a commune in the Morbihan department and Brittany region of north-western France. In French the inhabitants of Plougoumelen are known as ''Plougoumelenois''.
See also
*Communes of the Morbihan department
The following is a ...
, Brittany, France
File:Thatched roofs in Kerene.jpg, Thatched roofs in Kerene, Ethiopia
Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the ...
Material
![Korea south traditional house](https://upload.wikimedia.org/wikipedia/commons/5/57/Korea_south_traditional_house.jpg)
Thatch is popular in the United Kingdom, Germany, the Netherlands, Denmark, parts of France, Sicily, Belgium and Ireland. There are more than 60,000 thatched roofs in the
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
and over 150,000 in the Netherlands. Good quality straw thatch can last for more than 50 years when applied by a skilled thatcher. Traditionally, a new layer of straw was simply applied over the weathered surface, and this "spar coating" tradition has created accumulations of thatch over 7’ (2.1 m) thick on very old buildings. The straw is bundled into "yelms" before it is taken up to the roof and then is attached using staples, known as "spars", made from twisted hazel sticks. Over 250 roofs in Southern England have base coats of thatch that were applied over 500 years ago, providing direct evidence of the types of materials that were used for thatching in the medieval period. Almost all of these roofs are thatched with wheat, rye, or a "maslin" mixture of both. Medieval wheat grew to almost tall in very poor soils and produced durable straw for the roof and grain for baking bread.
Technological change in the
farming
Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to ...
industry
Industry may refer to:
Economics
* Industry (economics), a generally categorized branch of economic activity
* Industry (manufacturing), a specific branch of economic activity, typically in factories with machinery
* The wider industrial sector ...
significantly affected the popularity of thatching. The availability of good quality thatching straw declined in England after the introduction of the combine harvester in the late 1930s and 1940s, and the release of short-stemmed wheat varieties. Increasing use of nitrogen fertiliser in the 1960s–70s also weakened straw and reduced its longevity. Since the 1980s, however, there has been a big increase in straw quality as specialist growers have returned to growing older, tall-stemmed, "heritage" varieties of wheat such as Squareheads Master (1880), N59 (1959), Rampton Rivet (1937), Victor (1910) and April Bearded (early 1800s) in low input/organic conditions.
In the UK it is illegal under the
Plant Variety and Seeds Act 1964
The Plant Varieties and Seeds Act 1964 is an Act of Parliament, Act of the Parliament of the United Kingdom passed to allow regulation of the sale of plants. It was enacted for the UK to comply with its obligations as a member of International Un ...
(with many amendments) for an individual or organisation to give, trade or sell seed of an older variety of wheat (or any other agricultural crop) to a third party for growing purposes, subject to a significant fine. Because of this legislation, thatchers in the UK can no longer obtain top quality thatching straw grown from traditional, tall-stemmed varieties of wheat.
All evidence indicates that water reed was rarely used for thatching outside of East Anglia.
It has traditionally been a "one coat" material applied in a similar way to how it is used in continental Europe. Weathered reed is usually stripped and replaced by a new layer. It takes 4–5 acres of well-managed reed bed to produce enough reed to thatch an average house, and large reed beds have been uncommon in most of England since the Anglo-Saxon period. Over 80% of the water reed used in the UK is now imported from
Turkey
Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a list of transcontinental countries, transcontinental country located mainly on the Anatolia, Anatolian Peninsula in Western Asia, with ...
,
Eastern Europe
Eastern Europe is a subregion of the Europe, European continent. As a largely ambiguous term, it has a wide range of geopolitical, geographical, ethnic, cultural, and socio-economic connotations. The vast majority of the region is covered by Russ ...
, China and South Africa. Though water reed might last for 50 years or more on a steep roof in a dry climate, modern imported water reed on an average roof in England does not last any longer than good quality wheat straw. The lifespan of a thatched roof also depends on the skill of the thatcher, but other factors must be considered—such as
climate
Climate is the long-term weather pattern in an area, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteorologic ...
, quality of materials, and the roof pitch.
In areas where
palms are abundant, palm leaves are used to thatch walls and roofs. Many species of palm trees are called "
thatch palm Thatch palm is a common name for several different species of palm trees that are used for thatching, and may refer to:
*''Coccothrinax'', many species native to the Caribbean
*''Howea'', two species native to Lord Howe Island, Australia
*''Thrin ...
", or have "thatch" as part of their common names. In the
southeastern United States
The Southeastern United States, also referred to as the American Southeast or simply the Southeast, is a geographical region of the United States. It is located broadly on the eastern portion of the southern United States and the southern por ...
, Native and pioneer houses were often constructed of
palmetto-leaf thatch. The
chickee
Chikee or Chickee ("house" in the Creek and Mikasuki languages spoken by the Seminoles and Miccosukees) is a shelter supported by posts, with a raised floor, a thatched roof and open sides. Chickees are also known as chickee huts, stilt houses, ...
s of the
Seminole
The Seminole are a Native American people who developed in Florida in the 18th century. Today, they live in Oklahoma and Florida, and comprise three federally recognized tribes: the Seminole Nation of Oklahoma, the Seminole Tribe of Florida, an ...
and
Miccosukee
The Miccosukee Tribe of Indians of Florida is a federally recognized Native American tribe in the U.S. state of Florida. They were part of the Seminole nation until the mid-20th century, when they organized as an independent tribe, receiving fed ...
are still thatched with palmetto leaves.
Makuti thatching
Makuti is thatching made from the sun-dried leaves of the coconut palm Cocos nucifera
The coconut tree (''Cocos nucifera'') is a member of the palm tree family (Arecaceae) and the only living species of the genus ''Cocos''. The term "cocon ...
in
East Africa
East Africa, Eastern Africa, or East of Africa, is the eastern subregion of the African continent. In the United Nations Statistics Division scheme of geographic regions, 10-11-(16*) territories make up Eastern Africa:
Due to the historical ...
uses
Cocos nucifera
The coconut tree (''Cocos nucifera'') is a member of the palm tree family (Arecaceae) and the only living species of the genus ''Cocos''. The term "coconut" (or the archaic "cocoanut") can refer to the whole coconut palm, the seed, or the f ...
.
File:Sandager Havn 01.JPG, A thatching silvergrass (''Miscanthus'') field in Sandager, Denmark
File:Grassland on Imba Abba Salama.jpg, Grassland with thatching grass on Imba Abba Salama Mt. in Haddinnet
Haddinnet, also transliterated as Hadnet, is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. The ''tabia'' centre is in Addi Idaga village, located approximately 6.5 km to the northeast of the ''w ...
, Ethiopia
File:Closeup of thatching Ben W Bell 31 7 2005.jpg, A closeup of English thatching
File:Thatching Knots.jpg, Bundling technique used in straw thatching
File:Thatched Roof Inside View.jpg, Inside view of a straw-thatched house
File:Thatched roof with snow in Oga City Akita Prefecture March 2017.jpg, Thatched roof with snow, Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
File:Thatched Roof Moss.jpg, Outside layer of moss and lichen growing on thatch
File:Thatching - Jheel Meel - Kolkata 2011-12-22 7659.JPG, Thatching by hay for making Pandal
A ''pandal'' in India and neighbouring countries, is a fabricated structure, either temporary or permanent, that is used at many places such as either outside a building or in an open area such as along a public road or in front of a house. This ca ...
s at Kolkata
File:Besakih Bali Indonesia Pura-Besakih-04.jpg, Thatched roof made of ''ijuk'', or black sugar palm Sugar palm is a common name for several species of palms used to produce sugar.
:Species used include:
*''Arenga pinnata'' (syn. ''A. saccharifera'')
*''Borassus flabellifer''
*''Caryota''
:*'' Caryota urens''
*''Cocos nucifera''
See also
*Toddy ...
fibres, at Besakih
Besakih Temple ( Balinese: ᬧᬸᬭᬩᭂᬲᬓᬶᬄ) is a ''pura'' complex in the village of Besakih on the slopes of Mount Agung in eastern Bali, Indonesia. It is the most important, the largest and holiest temple of Balinese Hinduism, an ...
, Bali
Bali () is a province of Indonesia and the westernmost of the Lesser Sunda Islands. East of Java and west of Lombok, the province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan, and Nu ...
File:Heather thatching on Leanach Cottage, Culloden.jpg, Heather thatching at Culloden, Scotland
Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...
Maintenance in temperate climates
Good thatch does not require frequent maintenance. In England a ridge normally lasts 8–14 years, and re-ridging is required several times during the lifespan of a thatch. Experts no longer recommend covering thatch with wire netting, as this slows evaporation and reduces longevity.
Moss
Mosses are small, non-vascular flowerless plants in the taxonomic division Bryophyta (, ) '' sensu stricto''. Bryophyta (''sensu lato'', Schimp. 1879) may also refer to the parent group bryophytes, which comprise liverworts, mosses, and hor ...
can be a problem if very thick, but is not usually detrimental, and many species of moss are actually protective. , remains the most widely used reference book on the techniques used for thatching. The thickness of a layer of thatch decreases over time as the surface gradually turns to compost and is blown off the roof by wind and rain. Thatched roofs generally need replacement when the horizontal wooden 'sways' and hair-pin 'spars', also known as 'gads' (twisted hazel staples) that fix each course become visible near the surface. It is not total depth of the thatch within a new layer applied to a new roof that determines its longevity, but rather how much weathering thatch covers the fixings of each overlapping course. “A roof is as good as the amount of correctly laid thatch covering the fixings.”
Flammability
Thatch is not as flammable as many people believe. It burns slowly, "like a closed book," thatchers say. The vast majority of fires are linked to the use of wood burners and faulty chimneys with degraded or poorly installed or maintained flues. Sparks from paper or burned rubbish can ignite dry thatch on the surface around a chimney. Fires can also begin when sparks or flames work their way through a degraded chimney and ignite the surrounding semi-charred thatch. This can be avoided by ensuring that the chimney is in good condition, which may involve stripping thatch immediately surrounding the chimney to the full depth of the stack. This can easily be done without stripping thatch over the entire roof. Insurance premiums on thatched houses are higher than average in part because of the perception that thatched roofs are a fire hazard, but also because a thatch fire can cause extensive smoke damage and a thatched roof is more expensive to replace than a standard tiled or slate roof. Workmen should never use open flame near thatch, and nothing should be burnt that could fly up the chimney and ignite the surface of the thatch.
Spark arrestor
A spark arrester (sometimes spark arrestor) is any device which prevents the emission of flammable debris from combustion sources, such as internal combustion engines, fireplaces, and wood burning stoves.
Spark arresters play a critical role in t ...
s usually cause more harm than good, as they are easily blocked and reduce air flow. All thatched roofs should have smoke detectors in the roof space. Spray-on fire retardant or pressure impregnated fire retardants can reduce the spread of flame and radiated heat output.
On new buildings, a solid fire retardant barrier over the rafters can make the thatch sacrificial in case of fire. If fireboards are used, they require a ventilation gap between boarding and thatch so that the roof can breathe, as condensation can be a significant problem in thin, single layer thatch. Condensation is much less of a problem on thick straw roofs, which also provide much better insulation since they do not need to be ventilated.
Performance
The performance of thatch depends on roof shape and design, pitch of roof, position—its
geography
Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and ...
and
topography
Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the land forms and features themselves, or a description or depiction in maps.
Topography is a field of geoscience and planetary sci ...
—the quality of material and the expertise of the thatcher.
Advantages
Thatch has some natural properties that are advantageous to its performance. It is naturally weather-resistant, and when properly maintained does not absorb a lot of water. There should not be a significant increase to roof weight due to water retention. A roof pitch of at least 50 degrees allows precipitation to travel quickly down slope so that it runs off the roof before it can penetrate the structure.
Thatch is also a natural insulator, and air pockets within straw thatch insulate a building in both warm and cold weather. A thatched roof ensures that a building is cool in summer and warm in winter.
Thatch also has very good resistance to wind damage when applied correctly.
Thatching materials range from plains grasses to waterproof leaves found in equatorial regions. It is the most common roofing material in the world, because the materials are readily available.
Because thatch is lighter, less timber is required in the roof that supports it.
Thatch is a versatile material when it comes to covering irregular roof structures. This fact lends itself to the use of second-hand,
recycled
Recycling is the process of converting waste materials into new materials and objects. The recovery of energy from waste materials is often included in this concept. The recyclability of a material depends on its ability to reacquire the p ...
and natural materials that are not only more
sustainable
Specific definitions of sustainability are difficult to agree on and have varied in the literature and over time. The concept of sustainability can be used to guide decisions at the global, national, and individual levels (e.g. sustainable livin ...
, but need not fit exact standard dimensions to perform well.
Disadvantages
Thatched houses are harder to insure because of the perceived fire risk. In the UK, 50–80 thatched roofs are destroyed in house fires yearly. Because thatching is labor-intensive, it is much more expensive to thatch a roof than to cover it with slate or tiles. Birds can damage a roof while they are foraging for grubs, and rodents are attracted by residual grain in straw.
New thatched roofs were forbidden in London in 1212 following a
major fire, and existing roofs had to have their surfaces plastered to reduce the risk of fire. The modern
Globe Theatre
The Globe Theatre was a theatre in London associated with William Shakespeare. It was built in 1599 by Shakespeare's playing company, the Lord Chamberlain's Men, on land owned by Thomas Brend and inherited by his son, Nicholas Brend, and gra ...
is one of the few thatched buildings in London (others can be found in the suburb of
Kingsbury Kingsbury may refer to:
Places United Kingdom
* Kingsbury, London, a district of northwest London in the borough of Brent
** Kingsbury tube station, London Underground station
* Kingsbury, Warwickshire, a village and civil parish in Warwickshi ...
), but the Globe's modern, water reed thatch is purely for decorative purpose and actually lies over a fully waterproofed roof built with modern materials. The Globe Theatre, opened in 1997, was modelled on the original Globe, which was destroyed by a fire on a dry June night in 1613 when a burning wad of cloth ejected from a special effects cannon during a performance set light to the surface of the thatch. The nearby Rose Theatre was actually thatched with cereal straw, a sample of which was recovered by Museum of London archaeologists during the excavation of the site in the 1980s.
Some claim thatch cannot cope with regular snowfall but, as with all roofing materials, this depends on the strength of the underlying roof structure and the pitch of the surface. A law passed in 1640 in
outlawed the use of thatched roofs in the colony for this reason. Thatch is lighter than most other roofing materials, typically around , so the roof supporting it does not need to be so heavily constructed, but if snow accumulates on a lightly constructed thatched roof, it could collapse. A thatched roof is usually pitched between 45–55 degrees and under normal circumstances this is sufficient to shed snow and water. In areas of extreme snowfall, such as
parts of Japan, the pitch is increased further.
Archaeology
![Moirlanich Longhouse thatched roof](https://upload.wikimedia.org/wikipedia/commons/2/28/Moirlanich_Longhouse_thatched_roof.jpg)
Some thatched roofs in the UK are extremely old and preserve evidence of traditional materials and methods that had long been lost. In northern Britain this evidence is often preserved beneath corrugated sheet materials and frequently comes to light during the development of smaller rural properties.
Historic Scotland
Historic Scotland ( gd, Alba Aosmhor) was an executive agency of the Scottish Office and later the Scottish Government from 1991 to 2015, responsible for safeguarding Scotland's built heritage, and promoting its understanding and enjoyment. ...
have funded several research projects into thatching techniques and these have revealed a wide range of materials including broom, heather, rushes, cereals, bracken, turf and clay and highlighted significant regional variation.
More recent examples include the
Moirlanich Longhouse
Moirlanich Longhouse is a rare example of a cruck frame Scottish cottage. It is located at in Glen Lochay near Killin in the Stirling council area, Scotland. It is owned by the National Trust for Scotland and is open to visitors from May to Sep ...
,
Killin
Killin (; (Scottish Gaelic: ''Cill Fhinn'') is a village in Perthshire in the central highlands of Scotland. Situated at the western head of Loch Tay, it is administered by the Stirling Council area. Killin is a historic conservation village an ...
owned by the
National Trust for Scotland
The National Trust for Scotland for Places of Historic Interest or Natural Beauty, commonly known as the National Trust for Scotland ( gd, Urras Nàiseanta na h-Alba), is a Scottish conservation organisation. It is the largest membership organ ...
(rye, bracken & turf) and Sunnybrae Cottage,
Pitlochry
Pitlochry (; gd, Baile Chloichridh or ) is a town in the Perth and Kinross council area of Scotland, lying on the River Tummel. It is historically in the county of Perthshire, and has a population of 2,776, according to the 2011 census.Scotla ...
owned by
Historic Scotland
Historic Scotland ( gd, Alba Aosmhor) was an executive agency of the Scottish Office and later the Scottish Government from 1991 to 2015, responsible for safeguarding Scotland's built heritage, and promoting its understanding and enjoyment. ...
(rye, broom & turf).
[Holden, T G and Walker, B 2013 Sunnybrae Cottage, Pitlochry. Edinburgh: Historic Scotland Research report.]
Examples
*
Attap dwelling
An attap dwelling is traditional housing found in the kampongs of Brunei, Indonesia, Malaysia and Singapore. Named after the attap palm, which provides the wattle for the walls, and the leaves with which their roofs are thatched, these dwelling ...
, Southeast Asia
*
Blackhouse
A blackhouse ( ga, teach dubh ; gd, t(a)igh-dubh ) is a traditional type of house which used to be common in Ireland, the Hebrides, and the Scottish Highlands.
Origin of the name
The origin of the name blackhouse is of some debate. On the Is ...
, Scotland, Ireland
*
Chickee
Chikee or Chickee ("house" in the Creek and Mikasuki languages spoken by the Seminoles and Miccosukees) is a shelter supported by posts, with a raised floor, a thatched roof and open sides. Chickees are also known as chickee huts, stilt houses, ...
, Seminole
*
Palapa
Palapa is a series of Communications satellites owned by Indosat, an Indonesian telecommunications company (formerly by Perumtel and then by PT Satelit Palapa Indonesia/Satelindo). Starting with the first in July 1976, at which time Indones ...
, Mexico
*
Roundhouse (dwelling)
A roundhouse is a type of house with a circular plan, usually with a conical roof. In the later part of the 20th century, modern designs of roundhouse eco-buildings were constructed with materials such as cob, cordwood or straw bale walls and ...
, Iron Age European
*
Teito
Teito (also Palhoça in Portugal and Palloza in Galicia) is an Asturian term that designates a type of stone dwelling with a thatched straw or broom roof, found in western Asturias, especially in the Somiedo and Oscos area, and also in Galici ...
s e pallozas, Asturias and Galicia, Spain
*
Historic Villages of Shirakawa-gō and Gokayama
The Historic Villages of Shirakawa-gō and Gokayama are one of Japan's UNESCO World Heritage Sites. The cultural property consists of three historic mountain villages over an area of in the remote Shogawa river valley, stretching across the borde ...
* ''
Shinmei-zukuri
is an ancient Japanese architectural style typical of Ise Grand Shrine's ''honden'', the holiest of Shinto shrines.Encyclopedia of Shinto It is most common in Mie Prefecture.JAANUS
History
Ancient shrines were constructed according to the styl ...
''
*
Normandy
Normandy (; french: link=no, Normandie ; nrf, Normaundie, Nouormandie ; from Old French , plural of ''Normant'', originally from the word for "northman" in several Scandinavian languages) is a geographical and cultural region in Northwestern ...
,
Brittany
Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known ...
, France
See also
*
Dethatcher
A dethatcher or lawn scarifier is a device that removes thatch from lawns. Types of dethatchers include motorized dethatchers or those that can be pulled behind a garden tractor.
Thatch removal (dethatching)
Scarification or de-thatching of ...
, for lawns
*
Houses at Auvers
''Houses at Auvers'' is an oil painting by Vincent van Gogh. It was created towards the end of May or beginning of June 1890, shortly after he had moved to Auvers-sur-Oise, a small town northwest of Paris, France.
His move was prompted by his di ...
, depiction in art
*
Swiss cottage, Cahir Thatched cottage orné in
Cahir
Cahir (; ) is a town in County Tipperary in Ireland. It is also a civil parish in the barony of Iffa and Offa West.
Location and access
For much of the twentieth century, Cahir stood at an intersection of two busy national roadways: the Dublin ...
,
Ireland
Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...
.
*
Vernacular architecture
Vernacular architecture is building done outside any academic tradition, and without professional guidance. This category encompasses a wide range and variety of building types, with differing methods of construction, from around the world, bo ...
*
Woodway House
Woodway House is in Teignmouth, South Devon, England. It was at one time a farm on lands held by the Bishops of Exeter. In around 1815 a thatched "cottage" in the " cottage ornée" style of Horace Walpole's (1717–1797) Thames-side villa,Evans, ...
A thatched cob
cottage orné
Cottage orné () dates back to a movement of "rustic" stylised cottages of the late 18th and early 19th centuries during the Romantic movement, when some sought to discover a more natural way of living as opposed to the formality of the preceding ...
in
Devon
Devon ( , historically known as Devonshire , ) is a ceremonial and non-metropolitan county in South West England. The most populous settlement in Devon is the city of Plymouth, followed by Devon's county town, the city of Exeter. Devon is ...
,
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 to the southwest. It is separated from continental Europe b ...
.
*
Withy
A withy or withe (also willow and osier) is a strong flexible willow stem, typically used in thatching, basketmaking, gardening and for constructing woven wattle hurdles. A thatching material from willows
*
The House of the Five Senses
The House of the Five Senses is the main entrance of amusement park Efteling in the Netherlands. It was designed by Ton van de Ven and went operational in 1996, a year later than planned due to a general strike in the construction sector.
Detai ...
the largest thatch roof in the world in
Kaatsheuvel
Kaatsheuvel () is a town in the province of North Brabant, Netherlands situated along highways N261 and N628. With a population of roughly 16,600, it is the largest town in and the capital of the municipality of Loon op Zand, which also consists o ...
,
Netherlands
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, subdivision_type = Sovereign state
, subdivision_name = Kingdom of the Netherlands
, established_title = Before independence
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References
Bibliography
* .
Further reading
* Cox, Jo and Thorp, John R. L. (2001). ''Devon Thatch: An Illustrated History of Thatching and Thatched Buildings in Devon''. Tiverton: Devon Books.
*
External links
* .
* .
* .
Devon County Council (2003). ''Thatch in Devon''
{{Authority control
Building materials
Natural materials
Energy conservation
Sustainable technologies
Cereals
Roofs
Roofing materials
Straw products