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From Wikipedia, the free encyclopedia

Roofs with "beaver tail" tiles in Dinkelsbühl, Germany
Roofs with "beaver tail" tiles in Dinkelsbühl, Germany
Spanish Colonial style ceramic tile roof in Texas, US
Spanish Colonial style ceramic tile roof in Texas, US

Roof tiles are designed mainly to keep out rain, and are traditionally made from locally available materials such as terracotta or slate. Modern materials such as concrete and plastic are also used and some clay tiles have a waterproof glaze.

Roof tiles are 'hung' from the framework of a roof by fixing them with nails. The tiles are usually hung in parallel rows, with each row overlapping the row below it to exclude rainwater and to cover the nails that hold the row below. There are also roof tiles for special positions, particularly where the planes of the several pitches meet. They include ridge, hip and valley tiles. These can either be bedded and pointed in cement mortar or mechanically fixed.

Similarly to roof tiling, tiling has been used to provide a protective weather envelope to the sides of timber frame buildings. These are hung on laths nailed to wall timbers, with tiles specially molded to cover corners and jambs. Often these tiles are shaped at the exposed end to give a decorative effect. Another form of this is the so-called mathematical tile, which was hung on laths, nailed and then grouted. This form of tiling gives an imitation of brickwork and was developed to give the appearance of brick, but avoided the brick taxes of the 18th century.[1]

Slate roof tiles were traditional in some areas near sources of supply, and gave thin and light tiles when the slate was split into its natural layers. It is no longer a cheap material, however, and is now less common.

YouTube Encyclopedic

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  • ✪ Roofing - Slating
  • ✪ How to fit Clay roofing tiles using dry installation system - Tejas Borja
  • ✪ Spicer Tiles - British Handmade Clay Roof Tiles Production Video
  • ✪ 6 Roof and Pavement Tiles from Plastic Waste

Transcription

In this video you will see how slates are secured, how lead is used to construct a valley, and how ridge tiles are installed Slates are laid in alternating rows to ensure that the roof acts as a one complete unit, similar to how a block wall is constructed Slates are secured to the row below them using copper disc rivets, and are also being secured to the wooden battens using nails Here we see how lead is used to seal up the valley of a common roof As lead is highly malleable, it is easily moulded into the required profile Lead is also used to seal the roof around a chimney. The lead is secured to the blocks, then plastered over as seen Once the slate or tiles have been secured, the lead flashing can then be unfolded and moulded into place The lead in a valley is laid in strips, this allows the lead to expand and contract, depending on the weather As soon as the valley has been finished, slating can continue once again Slates are laid in rows, starting at the eaves. Note the double batten near the eaves, these are used to secure a row of 'undereaves' slates Eaveslates ensure that rain water will not seep through the joints of the bottom row of slates and enter the roof Slates are measured and cut to suit the valley of the particular roof Eaveslates are normal slates which are shortened on-site and are secured to the battens as normal Two rows of eaveslates are installed before a full-length slate can be fitted in place An aluminium flashing is also used to overlap the slate at verge level to ensure the roof remains water-tight Vents are installed to supply ventillation to the attic-space to prevent a build-up of moisture Vents help to prevent wood-rot in the roof structure by allowing moisture in the attic space to escape Vents are installed in the same way as slates, by securing them to the battens underneath Once all slates are in place, the ridge tiles can be installed. Ridge tiles overlap the slates and prevent water from entering the roof structure Ridge tiles are secured to the ridge board as shown The roof is now complete

Contents

Shapes (profiles)

Ancient Greek roof tiles
Ancient Greek roof tiles

A large number of shapes (or "profiles") of roof tiles have evolved. These include:

  • Flat tiles – the simplest type, which are laid in regular overlapping rows. An example of this is the clay-made "beaver-tail" tile (German Biberschwanz), common in Southern Germany. Flat roof tiles are usually made of clay but also may be made of stone, wood, plastic, concrete, or solar cells.
  • Plain Clay Tiles - The size of the plain clay tile 10.5"x6.5" or 265mm x 165mm was originally defined by statue in 1477 during the reign of Edward IV. These are double lap tiles made originally from clay but more recently in concrete. They are specified generally for their aesthetic properties. The colour were generated through the control of the kiln atmosphere to generate either red, brown or blue tiles depending on the degree of reduction in the kiln. Dreadnought Tiles still manufacture tiles in this traditional way.
  • Imbrex and tegula – an ancient Roman pattern of curved and flat tiles that make rain channels on a roof.
  • Roman tiles – flat in the middle, with a concave curve at one end and a convex curve at the other, to allow interlocking.
  • Pantiles – with an S-shaped profile, allowing adjacent tiles to interlock. These result in a ridged pattern resembling a ploughed field. An example of this is the "double Roman" tile, dating from the late 19th century in England and US.
  • Monk and Nun tiles, also called mission or barrel tiles – semi-cylindrical tiles laid in alternating columns of convex and concave tiles. Originally they were made by forming clay around a curved surface, often a log or the maker's thigh. Today barrel tiles are mass-produced from clay, metal, concrete or plastic.
  • Interlocking roof tiles – similar to pantiles with side and top locking to improve protection from water and wind.
  • Antefixes – vertical blocks which terminate the covering tiles of a tiled roof.

History

Roof fragment of Roman bath in Bath, Somerset, England
Roof fragment of Roman bath in Bath, Somerset, England
Roman roof tile fragment (78 mm wide by 97 mm high) found in York, England, with the impression of a kitten's paw
Roman roof tile fragment (78 mm wide by 97 mm high) found in York, England, with the impression of a kitten's paw
A tomb mural of Xinzhou, China dated to the Northern Qi (550-577 AD) period, showing a hall with a tiled roof, dougong brackets, and doors with giant door knockers (perhaps made of bronze)
A tomb mural of Xinzhou, China dated to the Northern Qi (550-577 AD) period, showing a hall with a tiled roof, dougong brackets, and doors with giant door knockers (perhaps made of bronze)

Tiled roofs first replaced thatched roofs in ancient Mesopotamia.[2] Fired roof-tiles occur from as early as the 3rd millennium BC in the Early Helladic House of the tiles in Lerna, Greece.[3][4] Debris found at the site contained thousands of terracotta tiles which had fallen from the roof.[5] In the Mycenaean period, roof tiles are documented for Gla and Midea.[6]

The earliest finds of roof tiles in archaic Greece are documented from a very restricted area around Corinth, where fired tiles began to replace thatched roofs at two temples of Apollo and Poseidon between 700 and 650 BC.[7] Spreading rapidly, roof tiles were within fifty years in evidence at a large number of sites around the Eastern Mediterranean, including Mainland Greece, Western Asia Minor, and Southern and Central Italy.[8] Early roof-tiles showed an S-shape, with the pan and cover tile forming one piece. They were rather bulky affairs, weighing around 30 kg (66 lb) apiece[9] - more expensive and labour-intensive to produce than thatch. Their introduction has been explained by their greatly enhanced fire-resistance, which gave desired protection to the costly temples.[10]

The spread of the roof-tile technique has to be viewed in connection with the simultaneous rise of monumental architecture in ancient Greece.[citation needed] Only the newly appearing stone walls, which were replacing the earlier mudbrick and wood walls, were strong enough to support the weight of a tiled roof.[11] As a side-effect, it has been assumed that the new stone and tile construction also ushered in the end of 'Chinese roof' (Knickdach) construction in Greek architecture, as they made the need for an extended roof as rain protection for the mudbrick walls obsolete.[12]

Production of Dutch roof tiles started in the 14th century when city rulers[where?] (Holland) required the use of fireproof materials. At the time, most houses were made of wood and had thatch roofing, which would often cause fires to spread quickly. To satisfy demand, many small roof-tile makers began to produce roof tiles by hand. Many of these small factories were built near rivers where there was a ready source of clay and cheap transport.

Tilehanging

Tilehanging in Weybridge, Surrey
Tilehanging in Weybridge, Surrey

Tilehanging or vertical tiling is the construction of a building with roof tiles hung vertically on the sides of the building.[13] It is a popular style used in vernacular and neo-vernacular architecture in Britain.[14]

In China

A roof in Hainan tiled using imbrices and tegulae
A roof in Hainan tiled using imbrices and tegulae

In China, roof tiles are in use throughout the country on temples and village houses. Both imbrex and tegula and mission tiles are used.

Temples typically use glazed, often ornate tiles and antefixes. The most common traditional colour is orange-yellow.

Old buildings mainly have simple, clay tiles that have been fired in a kiln. Tiled roofs, while once ubiquitous in China, are now used less. One reason for this is that the majority of new houses and apartment buildings in China are built with flat roofs.

Solar tiles

Dow Chemical Company began producing solar roof tiles in 2005, and several other manufacturers followed suit. They are similar in design to conventional roof tiles but with a photovoltaic cell within in order to generate renewable electricity. A collaboration between the companies SolarCity and Tesla produced a hydrographically printed tile which appears to be a regular tile from street level but is transparent to sunlight when viewed straight on.[15]

Gallery

See also

References

  1. ^ RW Brunskill, Illustrated Handbook of Vernacular Architecture (1970:58-61)
  2. ^ Woods, Michael; Woods, Mary B. (2000). Ancient Construction: From Tents to Towers. Ancient technology. Minneapolis: Twenty-First Century Books. p. 25. ISBN 9780822529989. Retrieved 2018-10-18. Because of the thatched roof's drawbacks, the development of clay roofing tiles was a great advance in building technology. The advance happened in Mesopotamia. Clay tiles, fired like pottery, were longer lasting and more waterproof than thatch.
  3. ^ Joseph W. Shaw, The Early Helladic II Corridor House: Development and Form, American Journal of Archaeology, Vol. 91, No. 1. (Jan. 1987), pp. 59–79 (59)
  4. ^ John C. Overbeck, “Greek Towns of the Early Bronze Age”, The Classical Journal, Vol. 65, No. 1. (Oct. 1969), pp. 1–7 (5)
  5. ^ J. L. Caskey, "Lerna in the Early Bronze Age", American Journal of Archaeology, Vol. 72, No. 4. (Oct. 1968), pp. 313-316 (314)
  6. ^ Ione Mylonas Shear, "Excavations on the Acropolis of Midea: Results of the Greek-Swedish Excavations under the Direction of Katie Demakopoulou and Paul åström", American Journal of Archaeology, Vol. 104, No. 1. (Jan. 2000), pp. 133–134
  7. ^ Örjan Wikander, p. 285
  8. ^ Örjan Wikander, p. 286
  9. ^ William Rostoker; Elizabeth Gebhard, p. 212
  10. ^ Örjan Wikander, p. 289
  11. ^ Marilyn Y. Goldberg, p. 309
  12. ^ Marilyn Y. Goldberg, p. 305
  13. ^ Stephen Emmitt; Christopher A. Gorse (5 February 2013). Barry's Introduction to Construction of Buildings. John Wiley & Sons. p. 208. ISBN 978-1-118-65858-1.
  14. ^ Paul Hymers (2004). Home Renovations. New Holland Publishers. pp. 123–4. ISBN 978-1-84330-696-2.
  15. ^ Becker, Rachel. "Check out Tesla's four different glass solar roofs". The Verge.

External links

This page was last edited on 3 December 2019, at 14:53
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