Optimization of Energy in Sustainable Architecture and Green Roofs in Construction: A Review of Challenges and Advantages

Table 4

Advantages and limitations of the extensive system.

Limitations	Advantages
Less energy saving and retention of water	Lightweight: normally, the roof does not need reinforcing
Extremely limited plant variety	Appropriate for spacious areas
Commonly, no links to recreation with other uses	Suitable for roofs with a 0–3 degree celsius slope
Unattractive to others, in fall in particular	Low upkeep and high durability
	No need for specialized irrigation and drainage systems
	The need for fewer technological skills
	Reasonable for retrofit projects as well
	Vegetation may grow on its own
	Relatively inexpensive
	More common
	Easier to request a planning reference for approval