| System Classification |
Type: |
Standard Extensive Green Roof |
|
Most Budget-Friendly: |
Ideal where budget and structural capacity are the primary limitations; focuses purely on high-impact environmental performance. |
| Structural & Logistics |
Saturated Weight: |
15 – 25 lbs/ft² (Very lightweight). |
| Total System Weight (Saturated): |
61,440 – 102,400 lbs (30.7 – 51.2 tons). |
| Stormwater Compliance |
Annual Water Retention: |
40% to 60% of annual rainfall. |
| Meets Minimum Compliance: |
Effectively captures and retains smaller, more frequent storm events required for WQv (Water Quality Volume) credits. |
| Max Single-Event Retention: |
Retains approximately 0.6 to 0.75 inches of rainfall depth. () |
| Energy & Asset Life |
Thermal Performance: |
Reduces HVAC cooling costs by 10-20% and blocks UV rays. |
| Urban Heat Island Effect: |
Surface temperature reduction of up to (). |
| Horticulture & Installation |
Plant Palette & Health: |
Limited to hardy, drought-tolerant plants, primarily Sedum cuttings and low-growing succulents. |
| Installation Method: |
Sedum Cuttings/Blankets over a drainage layer |
