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<h4>Filter Layer</h4>
 
<h4>Filter Layer</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>
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<p>The [[Geotextiles: 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>
 
{{:Green_roof_media}}
 
{{:Green_roof_media}}
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