An analytical study on rooftop greening in Hong Kong

Abstract

Air pollution and urban heat island effect caused from the development of infrastructures are getting serious, in which air flow is reduced and heat is trapped among high-rise buildings. In order to mitigate these problems, various methods have been developed in previous studies. Green roof has been identified as one of the most important means to mitigate these problems and implement sustainable development principles in the building features. Governments world-wide have been introducing various policies and regulations for promoting green roof particularly for building projects. However, existing buildings in Hong Kong display limited green roof features, especially for old buildings. Hong Kong is one of the most densely populated cities with many high-rise buildings. This paper examines the major barriers encountered in promoting green roof systems for existing buildings in Hong Kong. A case study approach is adopted to investigate how and why the barriers hindered the implementation of green roof features. Research results showed that lack of promotion and incentives from government and lack of government coordination are the top barriers to the implementation. This research concludes by providing suggestions and actions that can help mitigate these barriers.