Did you know that when designing a green roof, drainage at edge conditions must be carefully considered? A green roof edge plays a critical role in retaining the green roof system while allowing excess water to drain properly from the roof assembly.
Roof penetrations and roof edges must be evaluated together when selecting the components needed for a complete green roof system.
Green roof edge details must be carefully designed to both retain the green roof layers and allow for proper drainage of water. Without adequate drainage openings, water can accumulate at the perimeter and compromise system performance.
Edge detailing must work in coordination with the roof drainage strategy to support long-term durability.
Green roof edges are typically bent at 90 degrees. The bottom horizontal leg may fasten to or rest on the roof deck depending on project requirements.
The vertical leg includes drainage opening slots, usually starting at the bend location. The overall height of the green roof edge depends on project-specific conditions, including green roof depth and drainage requirements.
A wide range of materials are available, including:
Stainless steel
Copper
Powder-coated aluminum
Corten steel
PVC
Product lengths and heights vary to accommodate different green roof system depths and design needs. Selecting the right material helps balance durability, aesthetics, and compatibility with the overall roof system.
Design TOgether with your product manufacturer or Green Roofing Consultant to select the appropriate green roof system and green roof edge detail for your project. Proper coordination ensures edge conditions support drainage, system retention, and long-term roof performance.
In summary, well-designed green roof edge detailing is essential to managing water at the perimeter while maintaining the integrity of the green roof assembly.
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