Green Roof System Advantages And Disadvantages

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CHAPTER 1 INTRODUCTION 1.1 INTRODUCTION Green roofs are defined as a living system that is an extension of a roof. This green space can be below, at or above grade involving systems where plants are not planted in the ‘ground’. A green roof system contains a high quality waterproofing membrane and root barrier system, drainage system; filter fabric, a lightweight growing medium, and plants. Green roof systems can be modular layered systems already prepared in trays, including drainage layers, growing media and plants, or, each component of the system can be installed separately on top of the structure (L. Tolderlund, 2010). Leila Tolderlund (2010) and Townshend (2007) both had agreed that green roofs provide many economic, social and environmental benefits. The subcategories have been created with the understanding that many of these benefits could fit in several or all three categories. The benefits have been subdivided here to highlight significant aspects of these benefits. These major division of green roof benefit will be describe in further detail in the becoming chapter; Chapter 2. Green roof have become one of the green infrastructure. The value of ‘green infrastructure’ in urban landscapes is becoming increasingly recognised by health professionals, water managers, planners, policy makers and designers around the world. The rapid expansion of towns and cities contains the real risk of creating unliveable, unhealthy environments (Pitman, 2012). The contention

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