Nonwoven Geotextile Filter Layer for Green Roofs

A nonwoven geotextile filter layer helps prevent fine growing-media particles from entering and clogging the drainage layer. It remains permeable to water and is installed with appropriate overlaps above drainage components as part of a coordinated green roof assembly.

Green Roof Geotextile Filter Layer

Role in the Green Roof Build-Up

This component is normally installed above the drainage layer and below the growing medium. It should be treated as one part of a coordinated roof build-up rather than a standalone waterproofing or structural solution. The final assembly must maintain drainage continuity and allow roof outlets and inspection points to remain accessible.

Design and Installation Considerations

• Confirm required filtration performance, water permeability, roll overlap, protection at outlets and compatibility with adjacent layers.
• Prepare the substrate and adjacent layers so they are clean, stable and free from sharp projections.
• Follow the project drawings for orientation, overlaps, edge details and outlet treatment.
• Protect completed areas during the placement of subsequent layers and growing medium.
• Inspect the assembly before covering it and retain records of concealed work where required.

Typical Applications

Nonwoven Geotextile Filter Layer for Green Roofs can be considered for extensive or intensive green roofs, roof gardens, podium landscapes and other planted build-ups where its stated function matches the project design. Selection should be based on the complete system specification, roof geometry, vegetation, growing-medium depth, rainfall, drainage strategy and maintenance plan.

Project Support

For product selection and quantity planning, provide the roof plan, build-up detail, total area, outlet layout and project performance requirements. We can then coordinate the product format, packing and supply information while the project designer confirms the complete waterproofing, drainage and structural design.