Rammed earth is still popular as a sustainable solution
In response to some of the challenges of climate change, the building industry is turning to some throwback techniques to reduce site impact, but also create “thermal” structures that promote passive temperature control. Heat is not the only environmental challenge that we face. There are also major considerations on how structures can endure wildfires, earthquakes, hurricanes and tornadoes.
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One such ancient technique is rammed earth. This uses a subsoil mixture poured into a braced form in layers. It is then compacted by 50% of its volume with a tamping device before the next layer is added until each multiple batches forms a wall. Similar to a poured concrete wall, compacting the material and reducing air pockets and its drying time are part of what forms its strength.
Related: This rammed earth tiny house has a green solar roof
Modern day rammed earth builds employ traditional footings or a reinforced slab as the foundation. Additionally, it utilizes the soil that has been excavated from the site as part of the mixture poured into the forms that use plywood or timber to form the walls. The wood is removed after the desired height is achieved and must be worked with immediately if a texture is to be applied. This is because the soil mixture dries quickly and becomes too hard to work with if hardened.
Ancient builds
Rammed earth is a technique that has been excavated by archaeologists on almost every continent and in regions that range from arid desert to tropical. Examples of these structures surviving for thousands of years are a tribute to the endurance of this technique. A watchtower in China used in the Silk Road trade routes formed with the rammed earth technique in early 200 B.C. can still be seen today.
Many examples of these inspiring buildings using this technique have endured for thousands of years and have been found in Neolithic sites such as the Fertile Crescent. Much is being done to protect these sites so they can be studied to inform us about their longevity and durability.
Despite its ancient roots, the rammed earth technique has been employed in building some modern masterpieces all over the world. Whether as a portion of the structure or to create all the walls, this technique is growing in popularity.