Quick Answer
Building a rammed earth greenhouse is feasible and can be a cost-effective and sustainable solution for growing plants in desert or arid climates. It leverages the thermal mass of rammed earth to regulate temperatures, reducing the need for heating or cooling systems. With proper design and construction, a rammed earth greenhouse can provide a stable and healthy environment for plants.
Design Considerations
To build a rammed earth greenhouse, it’s essential to consider the local climate, soil conditions, and plant requirements. In desert or arid climates, the rammed earth walls can help to reduce heat gain during the day and retain heat at night, creating a stable temperature range for plants. The walls can be designed with a thickness of 10-12 inches, which provides sufficient thermal mass to regulate temperatures.
Construction Techniques
Rammed earth construction involves compacting a mixture of soil, sand, and gravel into a formwork, typically made of wood or steel. The mixture can be a combination of 70-80% soil, 15-20% sand, and 5-10% gravel, with a small amount of water added to achieve the right consistency. The formwork is typically 4-6 inches wide, and the mixture is compacted in 2-3 inch layers, with each layer being manually tamped to achieve a density of 120-140 pounds per cubic foot.
Thermal Mass and Insulation
To maximize the thermal mass of the rammed earth walls, it’s essential to minimize gaps and cracks between the blocks. A 1-2 inch gap can be left between the blocks to allow for movement and to reduce the risk of cracking. The walls can be finished with a 1-2 inch thick layer of plaster or stucco to seal any gaps and provide additional insulation. The roof can be designed with a simple gable or a curved shape to allow for snow run-off and to maximize natural light.
Additional Considerations
In addition to the design and construction techniques, it’s essential to consider the type of plants that will be grown in the greenhouse. Plants that require high humidity and temperature stability, such as orchids or succulents, may thrive in a rammed earth greenhouse. However, plants that require high temperatures, such as tomatoes or peppers, may require additional heating systems to thrive. The greenhouse can be equipped with shading systems, such as overhangs or trellises, to reduce heat gain during the day and to provide additional support for climbing plants.
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