ROOFSCAPING: CREATING GREEN ROOFS

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Intensive vs. extensive Green Roofs

Please note that this table is only a guide.

Characteristic	Extensive Green Roof	Intensive Green Roof
Vegetation	vegetative ground covers and grasses	large trees, shrubs, and well-maintained gardens

Soil	Requires only 25 -130mm of soil/ pebbles depth	Requires minimum of at least 300mm of soil/ pebbles depth

Drainage	simple irrigation and drainage systems	complex irrigation and drainage systems

Load	Adds only 0.5-2kg per square metre depending on soil characteristics and the type of substrate	Adds 3-7kg per square metre of load to building structure

Maintenance	annual maintenance	significant maintenance required

Access	usually not designed for public accessibility	regular access allowed

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