Feasibility analysis of roof gardening for old building renovation and sponge city design

Abstract The rapid progression of urbanization has led to an increase in residential density, particularly in older communities, which now face significant challenges such as internal land pressure, low rates of vegetation, and inadequate waterproofing of structural elements, particularly floor slabs. These conditions necessitate urgent improvements to enhance urban livability and sustainability. In this context, the exploration of minimal transformation measures that can effectively revitalize rooftop spaces has become a viable strategy for urban renewal. This study focuses on the Caojiaxiang Workers’ Village in Chengdu, China, as a representative case for examining the potential of such interventions. By implementing a rooftop garden designed by the principles of sponge city infrastructure, this research aims to facilitate the multifunctional use of rooftops, thereby contributing to sustainable green development. The sponge city concept emphasizes integrating natural processes into urban planning, allowing for improved stormwater management, increased biodiversity, and enhanced urban aesthetics. This study investigates the rooftop garden’s design, implementation, and ecological benefits, highlighting its role in mitigating the negative impacts of urbanization. The findings of this study are anticipated to offer valuable insights into effective urban design practices that can be applied in similar contexts. By examining the multifunctional use of rooftop spaces and their potential to enhance urban sustainability, this research contributes to the broader understanding of how cities can be adapted to withstand the pressures of urbanization better.