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<td>Fully saturated weight</td>
 
<td>Fully saturated weight</td>
 
<td>Low: 10 to 35 lb/ft<sup>2</sup> (48.8 to 170.9 kg/m<sup>2</sup>)</td>
 
<td>Low: 10 to 35 lb/ft<sup>2</sup> (48.8 to 170.9 kg/m<sup>2</sup>)</td>
<td>Varies: 10 to 35 lb/ft<sup>2</sup> (48.8 to 170.9 kg/m<sup>2</sup>)</td>
+
<td>Varies: 35 to 50 lb/ft<sup>2</sup> (170.9 to 244.1 kg/m<sup>2</sup>)</td>
<td>High: 10 to 35 lb/ft<sup>2</sup> (48.8 to 170.9 kg/m<sup>2</sup>)</td>
+
<td>High: 35 to 300 lb/ft<sup>2</sup> (170.9 to 1464.7 kg/m<sup>2</sup>)</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>

Revision as of 13:01, 9 April 2014

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: 35 to 50 lb/ft2 (170.9 to 244.1 kg/m2) High: 35 to 300 lb/ft2 (170.9 to 1464.7 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