HEAT ACCUMULATION REDUCTION IN CONDOMINIUM BUILDINGS USING MULTI-TYPOLOGY ROOFTOP LANDSCAPES

Abstract

This report presents the findings of the heat reduction performance of rooftop garden designs tailored to suit the activities of residents in four condominium buildings (Buildings A to D). The study applied four rooftop garden design types (Types 01 to 04), comprising open walkways, lawn areas, vegetative coverage, and swimming pools, respectively. Each design was installed on a concrete rooftop surface with a thickness of 0.15 meters. The rooftop area covered by Type 01 design elements was set at 80%, 60%, 40%, and 20% for Buildings A, B, C, and D, respectively. Temperature data collected from rooms and corridors beneath the rooftop gardens revealed that Building D had the lowest average indoor temperature, which was up to 2°C lower than that of Building A and up to 0.74°C below the average ambient temperature. In addition, heat flux measurements indicated a maximum reduction of 46% compared to baseline conditions prior to installation. This study underscores the influence of rooftop garden design principles, which collectively shape rooftop thermal behavior, and highlights the importance of ecological design strategies in enhancing indoor comfort and mitigating urban heat accumulation.