Making Bamboo Houses Easier to Build

More than 1 billion people around the world lack decent shelter. Of these, the majority live in urban areas, usually in slums and informal settlements (UN-HABITAT). Latin America has a serious shortage of adequate housing: in Colombia, 43 percent of the population needs decent housing; in Brazil, 45 percent; Peru, 53 percent.

The challenge is to provide good quality homes without significantly harming the environment – and with constrained budgets. Bamboo – cheap, strong, quickly renewable and beautiful to look at (http://en.wikipedia.org/wiki/Bamboo) – is an ideal solution to replace traditional wood lumber. In Bolivia, pioneering work is underway to improve the quality of homes and buildings made with bamboo.

Bamboo is the fastest growing woody plant in the world, sometimes growing over 1 metre a day. Bolivia (http://en.wikipedia.org/wiki/Bolivia) has about 17 identified bamboo species, of which five have a significant economic value. Around the world, there are 1,000 species of bamboo. They grow in a wide variety of climates, from cold mountains to hot tropical regions.

Once called the “poor man’s timber” – a temporary building material to replace once there is more money – bamboo is now getting the respect it deserves. Bamboo for housing has a long history in Latin America, stretching back 4,500 years to ancient civilizations. In Asia, it has long been a traditional construction material. But most of the existing bamboo dwellings in Latin America are 50 to 100 years old.

The most popular species of bamboo used in South America is Guadua, which is known for being large, straight and attractive.

“In Bolivia, there is no other building material more competitive in costs,” said Jose Luis Reque Campero, coordinator of the Bolbambu Programme of the Architectural Research Institute, Universidad Mayor de San Simon, Bolivia (http://www.umss.edu.bo/).

“Bamboo is the material that requires less energy, followed by wood and concrete, with steel in last place, needing energy necessary for its production 50 times greater than that required by bamboo.”

Campero also says bamboo is much less expensive than traditional building materials.

“But the biggest advantage is certainly the possibility of planting bamboo, and then reaping houses,” he said.

Campero has focused his efforts on a key component of bamboo housing: the joints that bind the bamboo poles together. Driven by the desire to find ways to improve the ease of building bamboo homes and their strength, Campero came up with the Bamboo Bolivia Space Structures, Structural System: EVO (BBSS-EVO) (named after Bolivia’s president, Evo Morales – http://en.wikipedia.org/wiki/Evo_Morales).

Traditional joints took a long time to make and required power tools and complex instruction manuals. Simplifying the building techniques necessary for bamboo construction was important because, while bamboo was cheap, the labour costs were high.

The joint looks like a giant two-headed Q-Tip. Each end is made of four pieces of bamboo, connected by a long screw with bolts on each end taken from old cars. The joint is inserted inside the bamboo poles and snaps shut, joining poles tightly together and, as each piece is assembled, looking like a child’s building toy as the structure of the bamboo home takes shape.

The new joint was easier to assemble and was quickly adopted by local builders. It also allows for a vast range of structures and shapes to be built, limited only by imagination and physics.

Devising joints made from bamboo has the advantage of avoiding the weight and cost of bringing in concrete, especially to remote areas.

“The manufacturing process is fully in the workshop and indoors,” said Campero, “which in addition to allowing a degree of quality control in production, improves working conditions for staff and protects the material.”

The whole building process adheres to “the principles of the famous phrase: ‘do-it-yourself’.”

The Evo joint allows for flexibility and easy assembly and disassembly, enabling the builder to move around parts of the structure and not be wedded to the original structural plan. This has the advantage of customizing the building to its physical location.

Working in the tropical forests of Cochabamba (http://en.wikipedia.org/wiki/Cochabamba), Campero has been testing his designs with the local people, who were looking to improve the tourist infrastructure in the resort town of Cristal Mayu.

Costa Rica in Central America – ironically a country without indigenous bamboo plants – has used its National Bamboo Project of Costa Rica (http://www.unesco.org/most/centram1.htm) to prove it is possible to both cultivate bamboo and use it to provide housing for the poor, confirming the wisdom of millions of people: bamboo is economical, convenient, safe and looks great.

Campero has received a great deal of interest in his innovations and is looking for funding partners in 2009 to take his work further.

He has this advice for other builders and designers: “Stick to developing local technologies, use what you have and innovate, use native materials and the local environment for the development of elements, components and construction systems. Don’t rely on advanced technology tools for manufacture, and stay in harmony with the human need for creativity.”

By David South, Development Challenges, South-South Solutions

Published: December 2008

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP's South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South's innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.  

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Rammed-Earth Houses: China Shows how to Improve and Respect Traditional Homes

The pace of change across the South has been blistering. Over the past decade, the overall population has moved from being primarily rural to majority urban. In the process, rural communities have suffered, as they have seen their young and ambitious leave in droves seeking a better life in cities.

More than 200 million Chinese farmers have moved to cities in recent years. It’s easy to see why. Chinese farms are tiny, with the average rural household farming just 0.6 hectares. And incomes are low compared to the cost of living: average annual income was just US$606 in 2007, a third of city salaries.

But it is possible to improve the quality of life in rural areas and in turn boost economic fortunes.

In China, projects that upgrade homes to modern standards while respecting traditional designs and architecture are breathing new life into rural communities. A return to the age-old technique of using earth as the principal building material is saving energy and keeping house costs low.

The tradition of packing earth to build a wall dates back to some of the earliest stretches of the Great Wall of China in 220 BC.

Currently it is estimated that half the world’s population-approximately 3 billion people on six continents – lives or works in buildings constructed of earth.

This traditional building technique is being used in the reconstruction effort to build new homes after the May 12, 2008 earthquake in Sichuan Province. The earthquake left millions of people homeless in the country’s worst natural disaster in 30 years, and has made low-cost but efficient house building critical.

In western China, villages have been entirely rebuilt from scratch. The application of research and science to the traditional designs – roofs in the pagoda style, with buildings arranged around courtyards – enabled the development of homes that are energy efficient to run, and are more hygienic and earthquake safe. In Yongren County of Yunnan Province, over 7,000 mountain dwellers were moved to better farming land and over 2,000 homes were built in the new village of BaLaWu. Over 30 of the homes were built using rammed earth by the Xi-an team.

“The original homes had very low living quality,” said team member Hu Rong Rong of the Green Building Research Centre of Xi’an University of Architecture and Technology (http://www.xauat.edu.cn/jdeg/about.html), which oversees building of the new homes. “The architecture layout of the indoor space and courtyard was not reasonable. In the courtyard the areas for living, raising livestock, storing and processing crops were mixed up. The indoor environment was not comfortable. It was cold in the houses during winter and hot during summer. Most of the rooms lacked natural lighting and were dark in the daytime.

“In the poor areas, many people still live in earth houses because of the low cost. However, most of the earth houses have low living quality.

“After we finished the project, through our design, the living quality was improved very much. The dwellers were satisfied with their new houses.”

Land reform in China has brought more hope to the country’s 750 million rural poor, many of whom live on less than US$1 a day. It is hoped that giving the rural poor more control over their lives will bring an improvement in agricultural production, food security and economic prosperity. Reforms also mean the poor have more secure land rights.

Hu said gaining the trust and buy-in of the villagers was critical to the success of the project.

“We built the first home as a demonstration. After we finished, the villagers could experience the advantages of the new home. Most of them decided to use our design and they could choose the one they liked from several proposals.”

Poverty is a big problem in the villages. Incomes are very low, at 2000 RMB per year (US $290). Hu said “families were given a house-building allowance of 8000 RMB (US $1,160) to meet the cost of building materials – and the land was free for them to use.”

“The villagers built the houses by self-help. We helped them to design and build the houses for free,” Hu said.

The houses are pioneering in using natural sources to provide light, heat, waste disposal and gas for cooking and heating.

“We used natural material like earth as a main building material to get good thermal mass and also to reduce CO2 emission,” Hu said.

“We designed a simple family sewage-purge-pool and marsh-gas-well system to reduce pollution and get energy from wastes.”

Using rammed earth has a long history in China. Across Western China, there are many buildings constructed with rammed earth. And using earth has many advantages when resources are scarce or expensive: “Earth buildings avoid deforestation and pollution, and can achieve low energy costs throughout their lifetime,” said Hu.

“With living standards increasing, more and more people would like to use burned bricks and concrete to build new houses, which will consume more energy and bring pollution,” said Hu.

But like any technology, the application of modern science and environmental knowledge to the traditional designs, can reap huge improvements in the quality of the homes and comfort levels. And win people back to the benefits of rammed earth dwellings.

“Building with earth materials can be a way of helping with sustainable management of the earth’s resources,” said Hu.

And Hu is adamant the new, environmentally designed homes respect the wisdom of traditional design.

“The new earth house design should consider the local culture. It should be proved that both the house style and the construction technique can be accepted by the users.”

By David South, Development Challenges, South-South Solutions

Published: December 2008

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP's South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South's innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.  

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A New House Kit for Slum Dwellers that is Safe and Easy to Build

 

By 2030, some 5 billion people around the world will live in cities. Next year, 2008, is predicted to be the tipping point, when urban dwellers (3.3 billion people) will outnumber rural residents for the first time. These are the conclusions of UNFPA’s State of the World Population 2007 Report. Even more strikingly, the cities of Africa and Asia are growing by a million people a week. And 72 percent of the population in sub-Saharan Africa live in slum conditions.

But as populations grow — and most will be poor, unemployed and under 25 — it becomes critical that effective solutions are found to ensure people can live with dignity and comfort. And design is being used more and more to overcome this challenge.

George Martine, author of the UNFPA report, is blunt: “We’re at a crossroads and can still make decisions which will make cities sustainable. If we don’t make the right decisions the result will be chaos,” he told the UK newspaper The Independent.

Guatemala-born architect Teddy Cruz of Estudio Teddy Cruz in San Diego, California, joins a small but growing number of socially responsible architects. He applies a concept more associated with middle class shoppers at the furniture design emporium Ikea to the world’s estimated one billion urban slum dwellers (UN-Habitat). Without legal title to the land they live on, packed tightly into densely overcrowded shantytowns, most squatters and slum dwellers live in makeshift homes made from whatever they can get their hands on. This is estimated to include half the urban population of Africa, a third of Asia and a fourth of Latin America and the Caribbean (Click here for more information).

The ad-hoc shelters and houses they build can be dangerously unstable, and vulnerable to natural disaster from flash floods to earthquakes. Cruz had noticed that while building supplies and materials were plentiful, nobody was selling safe and affordable housing frames for slum dwellers. According to the International Labor Organization, formal housing markets in developing countries rarely supply more than 20 percent of housing stock.

Cruz’s solution was to design a simple kit for building the frames for a house or a business that he now sells in Mexico. Each customer receives a manual, a snap-in water tank, and 36 frames that can be assembled in many configurations, or serve as a frame for poured concrete. These sturdy frames can also be added to with locally found materials. Cruz said he was inspired by “the resourcefulness of poverty” and by the cheap and affordable pre-fabricated homes that once were sold by catalogue by the American retailer Sears.

Cruz has been testing the structures in Tijuana, Mexico – a rapidly growing city on the border with the United States and a destination for Mexico’s poor. His work as an architect has centred on exploring how informal settlements grow faster than the cities they surround. These settlements, he says, break the rules and blur the boundaries between what is urban, suburban and rural. Cruz’s frame kits can be used to build a home, or combination of home and business, acknowledging the fact many people need to use their home as a business for a livelihood.

“These start-up communities gradually evolve,” said Cruz., ”or violently explode out of conditions of social emergency, and are defined by the negotiation of territorial boundaries, the ingenious recycling of materials, and human resourcefulness.”

By David South, Development Challenges, South-South Solutions

Published: July 2007

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP's South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South's innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.  

Follow @SouthSouth1

Like this story? Here is a dirty secret: this website is packed with stories about global South innovators. We spent 7 years researching and documenting these stories around the world. We interviewed the innovators to learn from them and we visited them to see how they did it. Why not use the Search bar at the top and tap in a topic and see what stories come up? As for my work, I have been involved with start-ups and media ventures since the early 1990s. While most tech entrepreneurs were either still in their nappies in the 1990s (or just a drunken night away from being conceived in the 2000s), I was developing content for this new thing they called the "Internet". In the years since I have learned a great deal about innovation and digital and have shared these insights in the stories on this website as well as in the 5 issues of Southern Innovator magazine. So, stick around and read some more!    

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