Using Edible Plant and Lightweight Expanded Clay Aggregate (LECA) to Strengthen the Thermal Performance of Extensive Green Roofs in Subtropical Urban Areas

Urban Farm DB summary

This study conducted a four-stage field experiment on a dormitory's flat rooftop in a subtropical climate during summer to measure the surface temperature and heat amplitude reduction of extensive green roofs using edible plants (Ipomoea batata) and lightweight expanded clay aggregate (LECA). Roofs with Ipomoea batata showed a significantly higher passive-cooling effect than those without, and roofs with 10%–40% LECA exhibited a slightly higher cooling effect than those with conventional garden soil. The combined effects of LECA and Ipomoea batata significantly reduced the bare rooftop's average temperature by an additional 10.19 °C.