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| Challenge | Main barriers |
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| Budget | Compared to traditional roofs, the cost of building green roofs depends on the type, materials, climate, and the aesthetic decisions by customers |
| Cheap electricity in some countries, which leads to the residents' unwillingness to install green roofs |
| Lack of financial support from governmental or nongovernmental sources |
| Different maintenance costs compared to traditional roofs |
| Failure to provide public and private developers with financial facilities |
| Lack of economically justified projects for developers from the public and private sectors |
| Excess plant maintenance costs |
| Lack of private-sector information on the benefits of investing in and supporting this sector |
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| Managerial aspects and organizational policies | Nonconsideration of the green roof, along with other planning policies and urban green space architecture, as part of the sustainable green space scheme |
| Failure to educate and inform municipality authorities, experts, and managers about the advantages of green roofs |
| Lack of programs and technologies built-in municipalities and green space commissions to address the needs and challenges of green roofing |
| Lack of symbolic public or private green roof projects |
| Not using the successful experiences of other nations in this field |
| Lack of consultants and contractors’ persuasion concerning operations and researches |
| Lack of local standards and a system for ongoing assessment to address challenges over time |
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| Legal aspects | Lack of a legal basis for encouraging investment in this sector |
| Lack of compulsory rules to build a green roof |
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| Technical and scientific infrastructure aspects | Quick construction and fitting of ordinary roofs and easy access to their accessories and equipment |
| Lack of awareness, practice, and relation with the green roofing industry |
| Lack of the native green roofing contractors |
| Lack of green roofing systems for residential houses, homes, etc. |
| Lack of a robust framework of software and hardware to access information and equipment in the consultation and implementation phases |
| The ability of traditional roofs to cover any type of building |
| Lack of applied research for metropolitan areas to extend and justify green roofs and to assess different types of plant species |
| Low scientific knowledge level for realistic evaluation in various local situations |
| Inability to use mobile irrigation systems |
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| Cultural aspects | Culturally normative compatibility with ordinary roofs |
| Lack of participation and management space between individuals due to the growth and maintenance of green roofs in residential and commercial areas |
| Lack of human capital and human staff preparation to construct, standardize and maintain green roofs |
| Lack of nongovernmental bodies |
| Lack of people’s culture regarding the sensitivity and significance of environmental and climate issues and the need to improve the situation |
| Lack of understanding of green roofs and their benefits by the public society |
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| Geographical aspects | Lack of community awareness about green roofs and their benefits |
| No green roofs in some metropolises or specific geographical areas within urban areas |
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