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Buildings play an important role in energy use and greenhouse emissions. Vegetated roofs, so-called green roofs, offer many benefits beyond energy savings. Among different building types, retail stores with flat and large roof/walls ratio, offer a match for this technology. Despite this potential in retail stores the literature review shows a lack of studies on the influence of vegetated roofs’ design parameters on the thermal and energy performance of retail stores. This study performs a parametric analysis to evaluate the influence of the main green roof design parameters on the thermal performance of a big-box retail stores. The selected climates are semiarid climates of Albuquerque (USA) and Santiago (Chile) and the marine climate of Melbourne (Australia) to inform engineers and architects design of vegetated roofs that fully use their thermal benefits. Based on the analyzed roofs, this study finds that: (1) vegetation …