Rammed-Earth Houses: China Respects Traditions, Improves Designs
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 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.”
- The Rural Development Institute focuses on land rights for the poor and has a series of articles on China’s land reforms. Website: www.rdiland.org
- Rural DeveIopment Institute has recently been given an award from the World Bank’s Development Marketplace competition to create Legal Aid and Education Centres in China’s countryside. Website: www.rdiland.org/PDF/092808_WorldBankComp.pdf
- A blog gives more details on the Chinese rammed earth project.
- Earth Architecture, a book and blog on the practice of building with earth, including contemporary designs and projects.
- A Canadian company designs and builds rammed earth houses. Website: http://www.rammedearth.info/
This work is licensed under a
Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.