Difference between revisions of "General characteristics of extensive and intensive green roofs"
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Revision as of 12:31, 19 August 2013
General characteristics of extensive and intensive green roofs (adapted from Green Roofs for Healthy Cities and the Cardinal Group, 2006).
Link to this table.
| Characteristic | Extensive | Semi-intensive | Intensive |
|---|---|---|---|
| Growing medium depth | 6 inches or less | 25% of green roof area above or below 6 inches | More than 6 inches |
| Accessibility | Often inaccessible | May be partially accessible | usually accessible |
| Fully saturated weight | Low: 10 to 35 lb/ft2 (48.8 to 170.9 kg/m2) | Varies: 10 to 35 lb/ft2 (48.8 to 170.9 kg/m2) | High: 10 to 35 lb/ft2 (48.8 to 170.9 kg/m2) |
| Plant diversity | Lower | Greater | Greatest |
| Cost | Low | Varies | High |
| Maintenance | Varies, but generally lower than for intensive green roofs | Varies | Varies, but generally higher than for extensive green roofs |
| Stormwater management | Best cost-benefit balance | More growing medium and more vigorous plant growth provides marginally greater stormwater volume benfits | More growing medium and more vigorous plant growth provides marginally greater stormwater volume benefits |