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How does geotextile fabric improve drainage board performance?
Geotextile fabric improves drainage board performance by acting as a filtration layer. It is commonly attached to the dimpled HDPE sheet so that water can pass through while soil particles are restricted from entering the drainage channels. This is important because fine sand, silt, and other soil materials can gradually block drainage pathways if they enter the system. When channels become clogged, water movement may decrease, affecting the drainage arrangement. The geotextile layer helps reduce this possibility by separating surrounding soil from the drainage cavity. Its filtration properties depend on fabric thickness, pore size, permeability, and the characteristics of the surrounding soil. Different projects may require different geotextile specifications. For example, drainage systems installed in fine-grained soil may need carefully selected filtration properties to maintain suitable water flow. The fabric must also be positioned correctly during installation to prevent gaps or damage. When the HDPE sheet and geotextile work together, they create a more complete drainage solution for foundations, retaining walls, and other underground applications.
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