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

MM
Miguel Martinez
CMI SA de CV
Sales Engineer
LB
Lineker Bis Hoffmann
Soma Urbanismo
Project Manager
RD
Richard Davis
TMP
Transforming Dead Malls into EPIC CENTER Smart Cities
ML
Márton Lugosi
Phoenix Contact
AD
Aashna Dodhia
KPMG
DD
DEFRY NUR MUHDI DHANA
UNIVERSITAS MERDEKA MADIUN INDONESIA
college student
FT
Farhad Tavakkol Hamedani
vapps
SC
SHUOTAO CHIANG
NIKKEN SEKKEI
SC
Sudipta Chakraborty
Innovative Consultancy
Proprietor
AP
Adarsh Patil
Infosys
Designer works in urban design
SM
Samuel Mabala
Cities Alliance
Country Urban Advisor
KK
Ka-Adilobari Kari
Heri Homes and Properties
GS
Gonçalo Serra
Optimeyes Energy
Energy Consultant
CH
Carlos Andrés Hernández Arriagada
Universidade Presbiteriana Mackenzie / Laboratório de Estratégias Projetuais - LABSTATEGY / FAUMACK
Researcher and Teacher in Design Strategies for Degraded Urban/Port Areas
GK
GEORGIA KOKOLAKI
Technical university of Crete
I am an architecture student
CB
Craig Brew
See.Sense
CA
Cynthia Aguirre
-
Architecture Student
BR
Bernd Reitmeier
Startup Factory (Kunshan) Co., Ltd.
Managing Director
NM
NILSON ANUBAL MENDOZA MENDOZA
BERIA INGENIEROS Y ARQUITECTOS
JJ
Jorge Jimenez
ICE
O&M buildings Manager