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Study on Green Roof Application in Hong Kong

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Study on Green Roof Application in Hong Kong ARCHITECTURAL SERVICES DEPARTMENT STUDY ON GREEN ROOF APPLICATION IN HONG KONG FINAL REPORT URBIS LIMITED 16 February 2007 Prepared by : 16 February 2007 Derek Townshend Date Checked by : 16 February 2007 Alexander Duggie Date Approved for Issue by: 16 February 2007 Alexander Duggie Date PART 1 – GREEN ROOFS OVERVIEW 1 INTRODUCTION............................................................................................................................................................6 1.1 DESCRIPTION OF THE STUDY.......................................................................................................................................................6 1.2 PURPOSE OF THE REPORT...........................................................................................................................................................6 2 GREEN ROOFS – DEFINITIONS, BENEFITS AND CONSTRAINTS...........................................................................7 2.1 DEFINITIONS OF GREEN ROOFS ..................................................................................................................................................7 2.2 BENEFITS OF GREEN ROOFS (AESTHETIC, ENVIRONMENTAL, AND ECONOMIC).................................................................9 2.3 CONSTRAINTS OF GREEN ROOFS .............................................................................................................................................22 3 SHOWCASE EXAMPLES............................................................................................................................................26 3.2 UNTERENSINGEN, GERMANY .....................................................................................................................................................26 3.3 CHICAGO CITY HALL, USA ...........................................................................................................................................................27 3.4 ACROS BUILDING , FUKUOKA, JAPAN........................................................................................................................................30 3.5 ROPPONGI HILLS, TOKYO, JAPAN ..............................................................................................................................................33 3.6 TAI LUNG LABORATORY, HONG KONG ......................................................................................................................................35 3.7 GUANGZHOU GREEN ROOFS, GUANGDONG, CHINA...............................................................................................................36 3.8 IFC2, HONG KONG.........................................................................................................................................................................39 4 FINDINGS OF DESKTOP RESEARCH.......................................................................................................................42 4.1 REVIEW OF INTERNATIONAL APPROACHES, STANDARDS, AND COVERAGE OF GREEN ROOFS ....................................42 4.2 REVIEW OF APPROACHES TO GREEN ROOFS IN HONG KONG.............................................................................................51 4.3 LOCAL ISSUES, CONCERNS, AND RESEARCH..........................................................................................................................53 4.4 CLIMATIC & ENVIRONMENTAL FACTORS INFLUENCING GREEN ROOF DESIGN & CONSTRUCTION IN HONG KONG....60 4.5 GREEN ROOF POTENTIAL IN HONG KONG................................................................................................................................62 4.6 GREEN ROOF BENEFITS TO HONG KONG.................................................................................................................................67 PART 2 – DESIGN & TECHNICAL GUIDELINES 5 GREEN ROOF SYSTEMS ...........................................................................................................................................70 5.1 ROOF TYPE SCENARIOS IN HONG KONG..................................................................................................................................70 5.2 BASIC COMPONENTS ...................................................................................................................................................................75 5.3 MAINTENANCE CONSIDERATIONS .............................................................................................................................................87 5.4 GREEN ROOF DESIGN CHECKLIST SUITABLE FOR HONG KONG ..........................................................................................88 6 INTENSIVE GREEN ROOFS (SKY GARDENS & PODIUM GARDENS) IN HONG KONG........................................94 6.1 CONSTRUCTION DETAILS............................................................................................................................................................94 6.2 SPECIAL CONSIDERATIONS FOR PODIUM GARDENS & SKY GARDENS...............................................................................94 7 EXTENSIVE GREEN ROOFS (ECO-ROOFS) IN HONG KONG.................................................................................97 7.1 CONSTRUCTION DETAILS............................................................................................................................................................97 7.2 MODULAR TRAY SYSTEMS..........................................................................................................................................................98 7.3 PLANT SELECTION FOR EXTENSIVE GREEN ROOFS ............................................................................................................101 7.4 EXTENSIVE GREEN ROOF PLANTING APPROACHES ............................................................................................................101 8 GREEN ROOF COST ESTIMATES FOR HONG KONG...........................................................................................103 8.1 CAPITAL COSTS ..........................................................................................................................................................................103 8.2 RECURRENT COSTS...................................................................................................................................................................107 PART 3 – CONCLUSIONS & THE WAY FORWARD 9 SUMMARY OF THE STUDY......................................................................................................................................110 9.1 BACKGROUND.............................................................................................................................................................................110 9.2 GREEN ROOF OPPORTUNITIES, CONSTRAINTS & CONSIDERATIONS FOR IMPLEMENTATION ......................................111 9.3 GREEN ROOF DIRECTIONS IN HONG KONG ...........................................................................................................................113 9.4 RECOMMENDATIONS AND THE WAY FORWARD....................................................................................................................114 APPENDIX I EXAMPLES OF PUBLIC BUILDINGS IN HONG KONG WITH GREEN ROOFS APPENDIX II PLANT SELECTION MATRIX FOR GREEN ROOFS (INTENSIVE & EXTENSIVE) APPENDIX III REFERENCES & BIBLIOGRAPHY This report is printed on recycled paper Urbis Limited December 2006 Page 1 List of Figures 2.1 Warming Trends: Globally and in Hong Kong 2.2 Typical Roof Temperature Differences and Infra-red Imaging 2.3 Albedo values of roofing materials 3.1 Lauer Building, Unterensingen, Germany 3.2 Intensive Green Roof, Lauer Building, Unterensingen, Germany 3.3 Retrofitted Extensive Green Roof on Public Buildings, Chicago City Hall 3.4 Intensive Green Roofs on the ACROS Office Block Building, Fukuoko, Japan 3.5 Close-up view of Intensive Green Roofs on the ACROS Office Block Building 3.6 Conceptual Architecture for Green Roofs 3.7 Intensive and Extensive Green Roofs on the Roppongi Hills Main Building 3.8 Intensive Green Roofs at Roppongi Hills, Tokyo 3.9 Intensive Green Roofs at Tai Lung Laboratory, Yuen Long, Hong Kong 3.10 Specialized Sedum Cultivar 3.11 Site A – Feng Huang Shan Hostel and Adjacent Residential Buildings 3.12 Site B – Guang Wei Lu Residential Buildings 3.13 Site C – Dong Wang Market and Adjacent Residential Buildings 3.14 Example of Sedum Lineare in Shenzhen 3.15 Roof Garden at IFC2, Showing Trees, Seating and Water features 3.16 Roof Garden at IFC2, Showing Lawned Areas and Cafeterias 3.17 Plan of Roof Gardens at IFC2 4.1 Extensive Green Roof Research Project by Gammon-Skanska 4.2 Green Roof Research at University of Hong Kong 4.3 Green Roofs on Bus Shelters 4.4 Green Roof at Kadoorie Farm 4.5 Roof Greening of Noise Enclosures 4.6 Sun Paths for Hong Kong, Latitude 22°N 4.7 Landsat Image of Hong Kong (Shortwave Infra-red bands) 4.8 Green Roof Opportunities in the City Centre 4.9 Green Roof Opportunities in the New City Centre Areas 4.10 Green Roof Opportunities in Residential Areas 4.11 Green Roof Opportunities on other Structures 4.12 Green Roof Opportunities on other Structures 4.13 Green Roof Opportunities on other Structures 5.1 Roof Type Scenarios in Hong Kong 5.2 Sky Gardens 5.3 Podium Gardens 5.4 Existing and Low-Maintenance Buildings 5.5 Utilities on New Buildings 5.6 Basic Components of a Green Roof
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