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Senegal architects ditch concrete for earth in revival of old techniques

World52 minutes ago (May 17, 2021 10:49AM ET)

(C) Reuters. A worker carries a newly made brick at the Elementerre factory in Mbour, Senegal May 10, 2021. REUTERS/Zohra Bensemra


By Nellie Peyton and Christophe Van Der Perre

DAKAR (Reuters) – Construction is booming in Dakar, where unfinished apartment blocks tower over most streets, their exposed concrete bricks a dull uniform grey.

In one site, however, a building stands out – the bricks the workers are laying are made of raw, red earth.

Concrete is inexpensive and used with abandon in Senegal’s capital, but it is poorly suited to the West African heat. On summer days, when temperatures frequently reach 100 degrees fahrenheit (38?C), the buildings become furnaces, cooled only with blasts of air conditioning.

Earth naturally regulates heat and humidity, say the founders of Worofila, an architecture firm specializing in bioclimatic design.

Since 2016, they have been pushing for the material to make a comeback. They say it could reduce pollution from cement factories and electricity production – and keep people cool.

“Before air conditioning, people paid attention to materials and orientation for the natural regulation of heat,” said Worofila co-founder Nzinga Mboup, while workers laid bricks for the upper floors of what will be a family home with a pool.

“The moment A/C arrived, these considerations went out the window.”

Senegal’s traditional dwellings were made of mud, but that has been abandoned. Dakar’s sidewalks today are littered with piles of sand and stones that are mixed with cement to make cheap building blocks.

To make modern earth bricks, workers mix soil with smaller amounts of cement and water to create a mixture that they cut into blocks, compress with a hand-operated machine and leave to dry for 21 days.

Unlike concrete, earth bricks require little energy to produce. Cement, the main ingredient in concrete, accounts for 8% of carbon dioxide emissions, according to British think tank Chatham House.

Earth construction is niche. It costs more than concrete and many people are unaware of the option. Worofila has been longlisted for an Ashden Award, a British prize for climate solutions, which it hopes will raise visibility.

“At the start we were looking for clients. Today we don’t look for them. We have a lot of demand,” said Doudou Deme, who in 2010 founded Elementerre, which makes earth bricks in Senegal.

Elementerre and Worofila have partnered on private homes, offices and part of a train station, but have barely made a dent in Dakar’s construction scene.

Still, when Mboup explains the concept it resonates, she said. People remember that their grandmother’s mud house in the village was always the coolest.

Senegal architects ditch concrete for earth in revival of old techniques

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