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Thatching

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Thatching is the traditional craft of constructing a roof using layers of dry vegetation. Builders use materials such as straw, water reed, sedge, rushes, heather, or palm branches. The primary goal is to layer these materials so they shed water away from the inner roof structure. Because the vegetation is densely packed, it traps air within the layers. This trapped air allows the thatch to function as natural insulation for a building.

pub.williams.arp.750pix
pub.williams.arp.750pix

This method is used in both tropical and temperate climates around the world.

The process of creating a thatch roof requires great skill and specific tools. A skilled thatcher first bundles the straw into groups known as yelms. These bundles are carried up to the roof to be installed. To secure the material, the worker uses staples called spars, which are made from twisted hazel sticks.

Moirlanich Longhouse thatched roof
Moirlanich Longhouse thatched roof

The longevity of the roof depends heavily on the depth of the thatch covering these fixings. If the horizontal wooden sways or the hair-pin spars become visible at the surface, the roof requires maintenance. In the United Kingdom, the maintenance cycle for thatch is typically between 12 and 15 years, at which time the ridge must be replaced.

Different regions utilize specific plants based on what is locally available. In Bali, Indonesia, builders use black fibres from the sugar palm called ijuk for temple roofs and meru towers.

PrayerAtBesakih
PrayerAtBesakih

In Hawaii, alang-alang grass is a common material, while Southeast Asian attap dwellings use nipa palm leaves. In Fiji, thatchers might combine fan palm leaf roofs with layered reed walls. In the southeastern United States, the Seminole and Miccosukee people use palmetto leaves for their chickees. Even in the UK, materials vary; while long straw and wheat reed are common, water reed is often used as a "one coat" material.

Korea south traditional house
Korea south traditional house

Because large reed beds are now uncommon in much of England, over 80% of UK water reed is imported from places like Turkey, China, and South Africa.

Thatching has a deep history that spans thousands of years. In Europe, wild vegetation like bulrush or heather was likely used during the late Palaeolithic period. As people began growing cereals during the Neolithic period, they likely started using straw.

Moirlanich Longhouse thatched roof 2
Moirlanich Longhouse thatched roof 2

In the Americas, great civilizations like the Maya, the Inca, and the Aztec lived in thatched structures. In the United Kingdom, thatch was the primary roofing material for most rural populations until the late 1800s. While the availability of materials like Welsh slate increased due to railways and canals, thatch remained common in the countryside. In the mid-1800s, the number of thatched properties in the UK actually increased as agriculture expanded.

Technological changes in farming have significantly impacted the availability of high-quality thatch. The introduction of the combine harvester in the late 1930s and 1940s reduced the supply of good quality straw. Additionally, the use of nitrogen fertilizer in the 1960s and 1970s weakened the straw, reducing its lifespan. To combat this, specialist growers have returned to planting "heritage" varieties of tall-stemmed wheat. These include varieties such as Squareheads Master, Rampton Rivet, and April Bearded.

Ogi Shirakawa06n3200
Ogi Shirakawa06n3200

However, in the UK, the Plant Variety and Seeds Act 1964 makes it illegal to trade certain older seed varieties, which can limit access to traditional materials.

There is a common perception that thatch is a major fire hazard, but the reality is more nuanced. Some people familiar with the material say that thatch burns slowly, comparing it to a closed book.

House river kwai
House river kwai

Most thatch fires are actually caused by faulty chimneys or wood burners rather than the thatch itself. Sparks from burning rubbish or degraded flues can ignite the surface. To prevent this, builders can strip thatch away from the immediate area of a chimney stack. Modern safety measures include installing smoke detectors in the roof space and using spray-on fire retardants to reduce the spread of flames.

Today, the status of thatching has shifted significantly in many places. In the UK, thatch was once seen as a mark of poverty, and its use declined during the agricultural recession of the late 19th century. However, over the last 30 years, it has become a symbol of wealth and a popular choice for those seeking an ecologically friendly or rustic look. There are approximately 60,000 thatched properties in the UK, and about 1,000 full-time thatchers remain in the profession. This renewed interest is driven by a desire to preserve historic buildings and use sustainable materials.

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🖼️ Images & Media (10)
File:pub.williams.arp.750pix.jpg
pub.williams.arp.750pix.jpg
File:87 - Machu Picchu - Juin 2009.jpg
87 - Machu Picchu - Juin 2009.jpg
File:PrayerAtBesakih.jpg
PrayerAtBesakih.jpg
File:Ogi Shirakawa06n3200.jpg
Ogi Shirakawa06n3200.jpg
File:Korea south traditional house.jpg
Korea south traditional house.jpg
File:House river kwai.jpg
House river kwai.jpg
File:Partially thatched roof.jpg
Partially thatched roof.jpg
File:Lucy in the sky.jpg
Lucy in the sky.jpg
File:Moirlanich Longhouse thatched roof 2.jpg
Moirlanich Longhouse thatched roof 2.jpg
File:Moirlanich Longhouse thatched roof.jpg
Moirlanich Longhouse thatched roof.jpg
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