Green roofs: advantages and disadvantages of rooftop gardens
This article is also available here in Spanish.

Green roofs: advantages and disadvantages of rooftop gardens

My list

Author | Eduardo Bravo

Rooftop gardens have become increasingly popular in urban centers in recent years. This system does not mean simply installing plants in individual and removable pots, but rather a permanent facility, made with plant elements designed to form part of the building’s structure.

FIRA-AZOTEAS-SOSTENIBLES-ENG

Types of green roofs

There are also different types of green roofs depending on the vegetation used and whether they are physically accessible. Therefore, green roofs may be classified as:

  • Extensive: an eco-roof covered with a lightweight, thin layer of vegetation, low-maintenance and non-accessible.
  • Semi-intensive: these create an ornamental green space using plants that require more care and more soil depth that those above, however, on the other hand, people can access them.
  • Intensive: rooftop gardens that accept all types of plant species, including trees. People can access them, but they do require a solid structure to bear the weight of vegetation and people.

green-roofs-23

Benefits of green roofs

Apart from their ornamental effect, rooftop gardens have beneficial effects on the environment and health of people. For example:

Air purification

The photosynthesis process carried out by the rooftop plants absorbs carbon dioxide and releases oxygen, while capturing dust and reducing pollution.

Ambient noise reduction

Green roof substrates tend to neutralize low-frequency sounds, while the plants block high frequency sounds. This means a roof with twelve centimeters of vegetation can reduce noise by forty decibels, and can reduce it by fifty decibels if it has a width of more than twenty centimeters.

green-roofs-24

Temperature regulation

Rooftop gardens help to moderate the ambient temperature thanks to the ability of plants to evaporate water. Furthermore, as it is not a reflective material like glass, granite, marble, stone and other floor coverings, it cools the outside of buildings and, consequently, reduces the surrounding temperature.

Increased biodiversity

Green roofs attract birds, insects and other animals and help to increase biodiversity.

Improved emotional health

Green roofs have a natural appearance and go from being aesthetically hostile elements to attractive gardens. This has a positive effect on the mood of residents who, given the characteristics or location of their properties, are not normally able to see green areas.

green-roofs-25

Disadvantages of green roofs

Despite the undeniable benefits, there are also some disadvantages to green roofs that should be taken into account before installing them.

Maintenance costs

Compared with conventional roofs, they entail greater costs both in their execution and maintenance.

Increased weight on the structure

Not all buildings are suitable for these systems, given the extra weight on top of the structure.

Water filtration due to rainwater retention

The installation of green roofs requires specialist professionals who know exactly how to design the space, together withthe irrigation and drainage systems. It then requires a good design to prevent, among others, the accumulation of rainwater under the structure that could lead to damp and filtrations.

Images | tinseling, erdenebayar, Free-Photos

Related content

Recommended profiles for you

AA
Aurelia Dewi Aurel
Institut Technology Sepukuh Nopember
Freelancer
MJ
margit jeppesen
Felicity Smart Infrastructure
JB
Jan Barenhoff
placense
Customer Success Manager
NB
Natalia Bruhl
Ufsc
Student
LB
Leire Balzategui
Fundación Vitoria-Gasteiz Araba Mobility Lab
Innovation Technical Manager
HD
Heng rang DJQucikSystemagrianger
ONE DRAGON CORPORATION
YY
Yuta Yoshimoto
Deloitte Venture Japan
RT
Rahul Tomar
DigitalTwin Technology GmbH
Managing Director
AG
Anaclara Gutierrez
SF Service
SF Service is a specialist company in international development of companies, cities and services.
CD
Catalin Dumitrescu
Kone
SG
Stephanie Grischkat
Redevco
Portfolio Assistant
MM
Matheus Moura
Porto Velho City Hall
Engineer
CD
Cinthya Diaz
FUAA
MR
Marin Racic
3D ART d.o.o.
ME
Maria Esteves
Estudio
KM
Kfir Maccabee
bezalel academy
CD
Carmen Duran
ALE
Vertical Account Manager
LO
Leo Ortega
Parsons International
GIS Lead
MK
Mark Kozakiewicz
Y2Architecture
TS
Tanmay Sharma
Fuel Bar
Businessman