• Welcome
• What is green roofing?
  • Why install a green roof?
    What are the benefits?
• Is your roof suitable for a green roof?
• Basic design requirements
• Structural requirements
  • Loading
  • Roof deck
  • Falls and drainage
  • Drainage design - diagrams
• Aspect and exposure
• Construction
  • Build up - layers explained
  • Build up - diagram of layers
  • Protection against wind uplift
  • Wind uplift - edging diagrams
  • Detailing
• Safe access and maintenance
• Caring for your green roof
  • Feeding
• FAQs
• More about Enviromat sedum matting
• Sourcing materials
• Contact us
• Back to Wildlife & Countryside Services

Structural Requirements: Good Design for Drainage Falls

Roof with straight falls to a valley gutter

Ponding occures between the outlets

Roof falls and cross-falls to internal outlets