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Plant Survival Rates Across Substrate Depths (%). 50 mm Depth: Sedum album 85, Delosperma cooperi 60, Festuca ovina 30, Allium schoenoprasum 20. 150 mm Depth: Sedum album 95, Delosperma cooperi 90, Festuca ovina 80, Allium schoenoprasum 75.
| Sedum album | Delosperma cooperi | Festuca ovina | Allium schoenoprasum | |
|---|---|---|---|---|
| 50 mm Depth | 85 | 60 | 30 | 20 |
| 150 mm Depth | 95 | 90 | 80 | 75 |
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Annual Maintenance Hours Over Ten Years (Hours per 100 m²). Extensive System: Year 1 40, Year 2 25, Year 4 15, Year 6 12, Year 8 10, Year 10 10. Semi-Intensive System: Year 1 70, Year 2 55, Year 4 45, Year 6 40, Year 8 38, Year 10 35.
| Year 1 | Year 2 | Year 4 | Year 6 | Year 8 | Year 10 | |
|---|---|---|---|---|---|---|
| Extensive System | 40 | 25 | 15 | 12 | 10 | 10 |
| Semi-Intensive System | 70 | 55 | 45 | 40 | 38 | 35 |
Engineered Green Roof Substrate Composition (%). Expanded Clay Aggregate 45, Crushed Pumice 25, Organic Compost 15, Coarse Sand 10, Zeolite Additives 5.
| Category | Value (%) |
|---|---|
| Expanded Clay Aggregate | 45 |
| Crushed Pumice | 25 |
| Organic Compost | 15 |
| Coarse Sand | 10 |
| Zeolite Additives | 5 |
Green Roof Retrofit Installation Sequence. Stage 1: Structural Deck Inspection. Stage 2: Root Barrier Membrane Laying. Stage 3: Drainage and Storage Layer Placement. Stage 4: Filter Geotextile Deployment. Stage 5: Growing Medium Installation. Stage 6: Drought-Tolerant Planting.
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