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      GREEN ROOFING IN INDIANA: CASE STUDIES AND DESIGN NOTES

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          INTRODUCTION

          Green roof technology and implementation are taking root in North America at an accelerating pace. Growing recognition of the benefits of green roofs and increasing interest in green infrastructure are leading to expansion of green roof technologies that have been in use for decades in Europe and elsewhere. While some regions have adopted the use of green roofs on a large scale, other areas are warming up to the concept more slowly. Large-scale implementation of green roofs has not yet occurred in Indiana, but a number of exemplary projects have been constructed, and there are signs that interest in the technology is increasing in the state. The purpose of this article is to provide an overview of green roof technology, analyze selected green roofs in Indiana, explore trends in the state, and address issues for future development of green roof technology in the region. A variety of green roofs were investigated throughout the state. Discussions were held with individuals involved in each project to obtain technical and logistical details of green roof design, installation, and performance.

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          Green Roofs as Urban Ecosystems: Ecological Structures, Functions, and Services

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            Establishment and Persistence of Sedum spp. and Native Taxa for Green Roof Applications

            Although the economic, environmental, and aesthetic benefits of green roofs have been recognized for decades, research quantifying these benefits has been limited—particularly in the U.S. Green roof usage and research is most prevalent in Germany, but can also be seen in several other European countries and Canada. If green roof installations are to be successful in Michigan and the rest of the U.S., then a better understanding of what specific taxa will survive and thrive under harsh rooftop conditions in this geographic area is required. Nine simulated rooftop platforms containing three commercially available drainage systems were installed at Michigan State University. Eighteen Michigan native plants planted as plugs and nine Sedum spp. planted as either seed or plugs were evaluated over three years for growth, survival during both establishment and overwintering, and visual appearance. All Sedum spp. tested were found to be suitable for use on Midwestern green roofs. Of the eighteen native plant taxa tested, Allium cernuum L., Coreopsis lanceolata L ., Opuntia humifosa Raf., and Tradescantia ohiensis L. are suitable for use on unirrigated extensive green roofs in Michigan. If irrigation is available, then other native species are potential selections.
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              THE ADOPTION OF AN INNOVATION: BARRIERS TO USE OF GREEN ROOFS EXPERIENCED BY MIDWEST ARCHITECTS AND BUILDING OWNERS

              While green roof technologies are increasingly employed in Northern European countries, adoption is progressing at a much slower rate in the US. This manuscript discusses results of a survey that quantified knowledge, barriers, and perceived costs and benefits to use of green roof technology among a sample of architects and building owners in the Midwest. The survey also examined conditions that may encourage use of this technology among the respondents. Results show that many respondents do not fully recognize the economic or performance advantages offered by green roof technologies. The payback period for economic advantage is longer than owners are willing to consider. Both owners and architects possess a wide range of misconceptions about the performance advantages of green roofs. While green roof technology offers clear environmental advantages such as reduced stormwater runoff, increased habitat, and cooler temperatures that mitigate heat island effects, many building owner respondents either do not know about or value these advantages. This research quantified potential adopters’ perceptions of an innovative technology and the survey results are interpreted and discussed within the conceptual framework of innovation diffusion literature. Strategies to hasten the adoption of green roof technology are suggested.
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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Summer 2010
                : 5
                : 3
                : 50-68
                Author notes
                Article
                jgb.5.3.50
                10.3992/jgb.5.3.50
                09e12e76-5a81-48a4-b1fa-9cd144195a18
                ©2010 by College Publishing. All rights reserved.

                Volumes 1-7 of JOGB are open access and do not require permission for use, though proper citation should be given. To view the licenses, visit https://creativecommons.org/licenses/by-nc/4.0/

                History
                Page count
                Pages: 19
                Categories
                INDUSTRY CORNER

                Urban design & Planning,Civil engineering,Environmental management, Policy & Planning,Architecture,Environmental engineering
                modular versus loose laid systems,energy efficiency,stormwater management,green roof maintenance and performance,green roof design and installation,green roof technology

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