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"There are a lot of resources given by nature for free, all we need is our sensitivity to see them and our creativity to use them," says architect Anna Heringer.

Heringer uses low-tech materials like mud and bamboo to create structures from China to Switzerland, Bangladesh and beyond.

Visit an awe-inspiring school, an elegant office and cozy social spaces, all built from natural materials, in this delightful talk.

"When I was an architecture student about 13 years ago, I went to Bangladesh to a remote village called Rudrapur with the aim to design and build a school as my thesis project. I had lived in that village before when I was 19 and a volunteer at Dipshikha, a Bangladeshi NGO for rural development.

And what I had learned from them was that the most sustainable strategy for sustainable development is to cherish and to use your very own resources and potential, and not get dependent on external factors. And this is what I tried to do with my architecture as well."

Fumes - Wisdom of mud buildings

"In terms of suitable building materials for my school, I didn't have to look far. They were right under my feet: mud, earth, dirt, clay, however you call it ... and bamboo that was growing all around." Anna Heringer

Fumes - Wisdom of mud buildings

"Except a small team of consultants like my partner for realisation, Eike Roswag, and my basket-weaver cousin, Emmanuel, it was all built by craftsmen from the village. And this is the METI school after six months of construction.

Load-bearing earth walls that really ground the school, and large bamboo structures that bring the lightness in."

Fumes - Wisdom of mud buildings

"The children all signed with their names in Bengali the doors, and they did not only sign, they also helped building the school... The children loved it.

And can you imagine the feeling of a small boy or a girl or an illiterate day labourer standing in front of that school building and knowing that you built this out of the ordinary bamboo and just the dirt underneath your feet, using nothing but your hands? That gives such an enormous boost of trust and confidence in yourself and the community."

Fumes - Wisdom of mud buildings

"...the material. Especially mud has a very poor image. When we think of mud, we think of dirt -- it's ugly, it's nondurable -- and this is the image I want to change. In fact, it's the 11th rainy season for this school now, really harsh, horizontal monsoon rains, and the walls are standing strong." Anna Heringer

Fumes - Wisdom of mud buildings

"So how does it work? First rule, a good foundation that keeps the wall dry from the ground, and second rule, a good roof that protects from the top, and third rule, erosion control.

Mud walls need speed breakers so that the rainwater cannot run down the wall fast, and these speed breakers could be lines of bamboo or stones or straw mixed into the mud, just like a hill needs trees or rocks in order to prevent erosion. It works just the same way."

Fumes - Wisdom of mud buildings

"And people always ask me if I have to add cement to the mud, and the answer is no. There is no stabiliser, no coating on these walls, only in the foundation."

"Yeah, and the great thing is, if an earth wall is not needed anymore, it can go back to the ground it came from, turn into a garden, or get fully recycled without any loss of quality. There's no other material that can do this, and this is why mud is so excellent in terms of environmental performance."

Fumes - Wisdom of mud buildings

"...more and more countries, load-bearing earthen structures are not allowed to be built anymore although they're traditional and have lasted for hundreds of years, and not because the material is weak, but because there are no architects and engineers who know how to deal with that material. So education on all levels, for craftsmen, engineers and architects, is really strongly needed. "

Fumes - Wisdom of mud buildings

"Equally important is technological development, like prefabrication developed by my colleague Martin Rauch, who is an Austrian artist and expert in earthen structures.

And he has created technologies for rammed earth elements, for prefabrication of rammed earth elements that include insulation, wall heatings and coolings and all sorts of electrical fittings that can be layered to multi storied buildings, and this is important in order to scale up and in order to fasten up the processes, like in the Ricola Herb Center in Switzerland."

Fumes - Wisdom of mud buildings

"...we need good built projects that prove you can build with an ancient material in a very modern way. It is not a matter of how old a material is; it's a matter of our creative ability to use it today.

These, for example, are three hostels that I did in China in the village Baoxi, about six hours by bus from Shanghai. The outside shape is woven bamboo, and the inside core is stones and rammed earth. And it is a traditional building material. Even large parts of the Great Wall of China have been built with rammed earth, but it's getting replaced by concrete."

"All around us, and just below our feet ... are wonderful natural building materials. Let's use them. And I deeply believe our homes, our work spaces, our cities would become more healthy and sustainable and more humane and beautiful."

Why listen

Before she became an architect, a visit to a small village in Bangladesh immediately hooked Anna Heringer on an ancient and yet neglected building material, earth. With its easy availability, durability and endless recyclability, she realised, there was a reason its use has persisted for thousands of years.

In the 2014 book, The Future of Architecture, she and her coauthors argue for a future that is low-impact and adaptable.

Know more about Anna Heringer

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