Green rooftop systems: a South African perspective
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Date
2016-02-29
Authors
Labuschagne, Petronella Hendrina
Journal Title
Journal ISSN
Volume Title
Publisher
University of the Free State
Abstract
The purpose of this study is to determine the outcome of green rooftop systems in South
Africa. Cities in South Africa are expanding with new developments. With development and
expansion comes the increase in pollutants, undesirable living conditions and challenges to
overcome. Rooftop gardens are not getting the recognition for the value of it to the
environment, the citizens, the industry and the buildings as such in South Africa. This is due
to lack of knowledge and innovation. Green rooftop systems is a relatively new concept in
South Africa.
The study used a literature review followed by field notes and 68 questionnaires received
back from contractors, quantity surveyors, engineers, architects and citizens of
Johannesburg.
The respondents do not have experience regarding the construction of green rooftop
systems, and thus indicates why professional members of the construction industry do not
recommend the development thereof. This further indicates that there is a lack of knowledge
in the industry regarding the construction of green rooftop systems and the benefits that
accompanies green rooftop systems. Despite the lack of knowledge in the industry, the
materials needed to construct green rooftop systems are available in South Africa.
Johannesburg seems to benefit most from improved air quality and better insulated
buildings. Other benefits also includes job creation, aesthetics, eliminating the heat island
effect, stormwater management and economic growth. Respondents do not utilise existing
green areas due to crime and unsafeness and green rooftop systems provide a secure and safe green area. Green areas also provide health benefits such as promotion of health,
reducing stress, depression and anxiety.
Drainage and structural integrity seems to be important factors that may limit the
development of green rooftop systems due to the financial impact. Incentives seem to be
the best way to encourage the development of green rooftop systems according to the
respondents. Therefore finance is a concern for the development of green rooftop systems
in South Africa; however, there is a demand for it as the respondents are willing to pay more
rent for property with green areas. Property value thus increases with the development of
green rooftop systems and absorbs the financial impact thereof.
There are different types of green rooftop systems with different cost implications and
according to the respondents, the semi-intensive green rooftop system will be feasible for
South African circumstances. The field notes presented that the few existing green rooftop
systems in Johannesburg are semi-intensive green rooftop systems. Green rooftop systems
may conserve indigenous plant species and create habitats.
In conclusion, Johannesburg will benefit from green rooftop systems, despite the capital
cost. The professionals in the construction industry do not have experience in the
construction of green rooftop systems and have a lack of knowledge thereof, thus do not
recommend the development of green rooftop systems to developers.
The lack of knowledge regarding the construction of green rooftop systems and the benefits
provided by green rooftop systems should be addressed, not only the construction industry,
but also to the public.
Description
Keywords
Green rooftop systems in South Africa, The South African perspective of green rooftop systems, How to construct green rooftop systems, Effects of green rooftop systems, Green roofs (Gardening), Green roofs (Gardening) -- Envrionmental aspects, Dissertation (M.Sc.Q.S. (Quantity Surveying and Construction Management)) -- University of the Free State, 2016