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| Author: | Carter, T. Keeler, A. |
| Title: | Life-cycle costbenefit analysis of extensive vegetated roof systems |
| Journal: | Journal of Environmental Management
2008 : MAY, VOL. 87:3, p. 350-363 |
| Index terms: | cost benefit analysis management research environmental protection sustainable development sensitivity analysis life cycle cost construction industry |
| Freeterms: | green roof green building best management practices stormwater energy air |
| Language: | eng |
| Abstract: | Based on the use of vegetation on a rooftopcommonly called a green roofas an alternative to traditional roofing materials is an increasingly utilized example of such practices. The vegetation and growing media perform a number of functions that improve environmental performance, including: absorption of rainfall, reduction of roof temperatures, improvement in ambient air quality, and provision of urban habitat. This article uses data collected from an experimental green roof plot to develop a benefit cost analysis (BCA) for the life cycle of extensive (thin layer) green roof systems in an urban watershed. The results from this analysis are compared with a traditional roofing scenario. The net present value (NPV) of this type of green roof currently ranges from 10% to 14% more expensive than its conventional counterpart. A reduction of 20% in green roof construction cost would make the social NPV of the practice less than traditional roof NPV. Considering the positive social benefits and relatively novel nature of the practice, incentives encouraging the use of this practice in highly urbanized watersheds are strongly recommended. |
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