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Do green roofs have any disadvantage?

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In spite of mitigating the urban heat island phenomenon and offering numerous other benefits, green buildings have some potential disadvantages. Although they might be negligible or inconvenient to a particular group of people, these defects should be mentioned.

 

Green walls and green roofs may be more expensive compared to the traditional building envelope technologies due to higher installation and maintenance costs.  Moreover, they also require more frequent upkeep than traditional facades and roofs, especially during the establishment of the ecosystem. In addition, as the green infrastructure hosts an entire ecosystem, it also provides home to insects and rodents which is something that some people might find unpleasant. Furthermore, in contrast to green walls that cool the ground level, green roofs provide cooling effects on the roof level. Finally, extensive green roofs don’t cool effectively during heat waves in contrast to intensive roofs.