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<h4>Geotextile</h4>
<h4>Geotextile</h4>
<p>The geotextile layer is included to prevent migration of the planting medium into the drainage layer. Current advice is to specify a free draining textile to prevent potential water-logging of the planting medium. Observations green roof assemblies have shown a reduction of flow from specifications owing to interactions of medium particles with the textile.</p>
<h4>Planting Medium</h4>
<h4>Planting Medium</h4>
<p> Some projects expect the low growing <em>Sedum</em> to remain in graphic designs according to species and flower color. This is not a realistic expectation without significant maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. Designs which incorporate both <em>Sedum </em> and native species can help with this. </p>
<p> Some projects expect the low growing <em>Sedum</em> to remain in graphic designs according to species and flower color. This is not a realistic expectation without significant maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. Designs which incorporate both <em>Sedum </em> and native species can help with this. </p>
See: [[Planting for Green Roofs]]
See: [[Planting for Green Roofs]]
<h4> Drains and Vegetation Free zones </h4>
<p>To prevent accumulation of sediment and migration of the vegetation, clear spaces should not be filled with decorative aggregate or river rock. Instead pavers or other surfaces that do not actively trap particles will reduce weeding maintenance</p>.
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