Quick Answer
Waterproofing rammed earth involves applying a breathable membrane, sealing joints and cracks, and using a durable soil mix with low porosity. A well-designed drainage system is also crucial to prevent water accumulation. Regular maintenance is essential to ensure the long-term integrity of the structure.
Preparing the Soil Mix
To create a waterproof rammed earth structure, it’s essential to use a soil mix with low porosity. A mix with a high sand content (around 60-70%) and minimal organic matter is ideal. Adding a small amount of cement or lime can help improve the mix’s durability and water resistance. The mix should also be compacted tightly to minimize pores and reduce water infiltration.
Applying a Breathable Membrane
A breathable membrane, such as a waterproofing agent (0.5-1 mm thick) or a specialized rammed earth coating (1-2 mm thick), should be applied to the exterior surface of the structure. This will help prevent water from entering the wall while allowing moisture to escape. The membrane should be applied according to the manufacturer’s instructions and sealed at joints and corners.
Sealing Joints and Cracks
To prevent water from entering the structure through joints and cracks, a flexible sealant (such as silicone or polyurethane) should be applied. The sealant should be flexible enough to accommodate thermal expansion and contraction of the structure. Joints should be sealed at regular intervals (around 1-2 meters apart) and at corners and edges. Regular maintenance is crucial to ensure the sealant remains effective and to prevent water accumulation.
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