Roofing in Spain

Spain's roofs follow its climate and geology. The rainy Atlantic north-west is the heartland of natural slate, the drier centre, east and south are roofed with curved clay tiles, and flat roof terraces are common in low-rainfall areas and on modern apartment blocks. Spanish tile and building traditions also travelled with Spanish settlement to the Americas and Asia.

Climate and hazards

A Spanish roof may need to cope with Atlantic rain and wind in Galicia and Asturias, winter snow in the mountains, and long, hot, dry summers in the interior and the Mediterranean south and east. Traditional building answered these conditions directly: the thatched pallozas of the Ancares range sit at around 1,200 m (3,900 ft) and were built to withstand severe winters, while the flat azotea is typical of places with little rain. Structural actions such as snow, wind and earthquake loads are dealt with under the national building code and the Eurocodes (see below).

Roofing history

The oldest roof form traceable in the north-west is the round, thatched house. Ethnographers link the stone-walled, straw-roofed palloza to the circular buildings of the pre-Roman Castro culture and other Atlantic Iron Age peoples, although the palloza is larger and housed animals as well as people.

Fired clay tiles came with Roman rule. The curved tile now called teja árabe ("Arab tile") is, despite its name, of Roman origin; it is named after its very wide use in al-Andalus, the Muslim-ruled Iberian Peninsula. Glazed tiles were later used decoratively, for example in Aragonese Mudéjar work. Raised granaries (hórreos) are documented in the north from the 9th century, the oldest written use of the word dating from the year 800, and the oldest surviving examples from the 15th century.

With Spanish colonisation, tile roofing spread to the Americas and Asia. In California, clay tiles were first produced at Mission San Antonio de Padua in 1780, and colonial churches in Central America, such as Santa Lucía in Honduras, still carry Roman-style pan-and-cover roofs. In Catalonia and Valencia the thin brick "Catalan vault", laid in layers of flat bricks without formwork, became famous through Antoni Gaudí and Rafael Guastavino; the name was coined at an architectural congress in Madrid in 1904.

Traditional and vernacular roofs

• Teja árabe: a single tapered half-cone of fired clay that can serve as channel (canal), cover (cobija), ridge (cumbrera) and valley or hip (lima). Rows of channels collect rain and the covers seal the joints.
• Teja a la segoviana: a Castilian variant using only channel tiles bedded on clay, with no covers.
• Laying methods: teja vana tiles rest loose on battens over rafters, which ventilates well but needs yearly maintenance after storms; a la provenzal adds triangular timber supports under the channels; the modern method sets tiles on a solid deck, with channels nailed or every sixth or seventh row of covers bedded in mortar.
• Slate: in Galicia and neighbouring León, local slate is the traditional covering.
• Palloza: circular or oval stone houses 10-20 m (33-66 ft) across with conical rye-straw thatch and no chimney, found in the Ancares, El Bierzo and western Asturias.
• Azotea: a flat, accessible roof used for drying laundry, water tanks and, today, solar equipment.

Roofing today

New houses typically use clay or concrete interlocking tiles on pitched roofs, or flat roofs waterproofed with membranes. Slate remains common in the north-west.

Codes, standards and regulation

The Código Técnico de la Edificación (CTE) was approved by Royal Decree 314/2006 of 17 March. Its basic documents cover structural safety, fire safety, safety in use and accessibility, energy saving, noise protection and health and moisture (salubridad), which together govern roof structure, fire behaviour, insulation and waterproofing. A draft royal decree modifying the CTE, partly transposing EU Directive 2024/1275 on the energy performance of buildings, went to public consultation in late 2025. As an EU member, Spain also applies the Eurocodes for structural design.

Industry

Spain is the world's largest producer and exporter of natural roofing slate and the source of about 90% of the natural slate used for roofing in Europe. Most comes from Galicia, where the larger producers are concentrated in Valdeorras (Ourense), with other workings at Quiroga, Ortigueira and Mondoñedo. The Palaeozoic deposits are more than 500 million years old, and good Spanish slate absorbs less than 0.4% water, which gives strong frost resistance. It is usually fixed with hooks rather than nails. The traditional tile works is a tejar or tejería.

Notable roofs

• Hórreo of Carnota (A Coruña): one of the longest hórreos, about 35 m (115 ft).
• Pallozas of Piornedo (Lugo): a group of 14 pallozas listed as a Bien de Interés Cultural; one has been an ethnographic museum since the 1970s.
• Catalan vaults: the thin-tile vaults of Gaudí and Guastavino.

Local roofing terms

• tejado - pitched tiled roof; cubierta - roof (general)
• teja árabe / teja curva - curved clay tile
• canal / cobija - channel tile / cover tile
• cumbrera - ridge; lima - hip or valley
• azotea - flat roof terrace
• teito - thatch (Galician-Asturian), as in casa de teito
• hórreo, panera - raised granaries with tiled, slate, thatched or slab roofs

Sources and gaps

Census data on roof materials and information on Spanish clay-tile manufacturers: published information is limited.