Quick Answer
Plants with high thermal mass and low evapotranspiration rates, such as succulents and cacti, are ideal for enhancing rammed earth's thermal properties. These plants help to absorb and release heat slowly, reducing temperature fluctuations. They also require minimal watering, making them suitable for desert and arid climates.
Choosing the Right Plants
When selecting plants for enhancing rammed earth’s thermal properties, it’s essential to choose species that thrive in desert and arid climates. Succulents and cacti are excellent options, as they have a high thermal mass and low evapotranspiration rates. For example, the ‘Desert Rose’ (Adenium obesum) has a high thermal mass due to its thick, fleshy stems, while the ‘Prickly Pear’ (Opuntia spp.) has a low evapotranspiration rate, requiring minimal watering.
Planting Techniques
To maximize the thermal benefits of these plants, it’s crucial to plant them in a way that allows them to absorb and release heat slowly. One technique is to plant the succulents and cacti in shallow trenches or depressions, about 1-2 feet deep and 3-4 feet wide. This allows the plants to absorb heat from the surrounding soil and release it slowly, reducing temperature fluctuations.
Soil Mix and Formwork Considerations
When building rammed earth walls, it’s essential to consider the soil mix and formwork to ensure optimal thermal performance. A soil mix with a high clay content (around 20-30%) is ideal for absorbing and releasing heat slowly. Additionally, using a formwork with a rough texture can help to increase the surface area of the rammed earth, allowing it to absorb and retain heat more effectively.
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