Construction using rammed earth has already been done for centuries by several civilizations. And in recent years, this building material has been getting back its well-deserved recognition, as people are now looking for more sustainable material options.
Rammed earth walls are made either by ramming soil into blocks which are then arranged to make walls, or by building whole walls themselves.
The process of making these walls involves the usage of completely natural materials like soil, chalk, lime and gravel. It also has an additional benefit of using the locally available soil which uses low energy and produces very little waste.
Rammed earth has the ability to absorb heat during the day and release it during the night. This property greatly reduces the need for air conditioning even during summers. It also helps regulate humidity.
Rammed earth is one of the most durable earth materials. Properly constructed rammed earth walls (with appropriate soil types and constitutions) can stand for thousands of years.
These walls can bear loads well, depending on the soil. Soil with less clay can bear more load. Additionally, adding cement can increase this property.
Once the technique is observed, it’s easy even for semi-skilled and unskilled laborers to work with.
The thickness of rammed earth walls vary based on local regulations and preferences. But compared to walls built using other materials, they are quite thick, making them suitable for sound-proofing.
Since rammed earth walls are mostly made up of earthen materials like soil and gravel, they are highly fire-resistant.
In case of cracks or blemishes, the soil mixture can be plastered and then sanded smooth. These walls are also termite-resistant.
Rammed earth walls have the natural texture and even colour of the earth. They have beautiful organic textures of the soil that was used to make the walls. Usually, coating or finishes are not given to preserve this look.
The durability, strength and load bearing capacity of a rammed earth wall highly depends on its soil type. Poor quality soil selection might affect the building.
Although rammed earth is an excellent option for hot and humid climates for its heat absorbing quality, it is not ideal for colder climates. These walls might need an additional layer of thermal insulation.
Rammed earth walls might not get washed away, but long exposure to excessive rains can cause erosion. These walls are mostly lifted 225 mm above ground to prevent water damage.
Since rammed earth walls are mostly made as one whole wall, they are not easy to modify or change later on, once the structure is built.
The process of construction of a rammed earth wall is simple but very tedious. Since modifications are hard to make, the room for experimentation and errors are very less.
Rammed earth is probably one of the most sustainable options in the market. Although it might not be the best option in cold or rainy climates, in a country like India, which is majorly hot and humid, it is a very good choice.
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