How buildings in Johannesburg could benefit from green roofs

with attenuating extreme temperatures by keeping the rooms below the roof cool in summer and warm in winter.what benefits green roofs might bring to Johannesburg, a city in South Africa’s interior. There are a few buildings with green roofs in the inner city, but these are not common. Johannesburg’s climate – with high day time temperatures in summer and winter, as well as a– has not been previously researched to see whether its buildings might benefit from green roofs.

effect, a phenomenon that creates a bubble of warm air over a city that attracts rainfall over the city at the expense of the surrounding countryside.We built three scale models: one of a vegetated roof, the other of a soil roof devoid of planting, and the third of a tile roof. These were fitted with heat sensors on the exterior and interior, which allowed us to explore the models’ thermal performance.

Exterior temperatures for the green roof closely matched ambient temperatures, suggesting that this roof type would help in minimising the Urban Heat Island effect. The soil roof returned the highest minimum temperatures, attributed to the dark colour of the soil that absorbs heat during the day. This roof gave the best thermal comfort levels at night; however, this roofing solution is not recommended since the exterior maximum temperatures were considerably higher than the ambient temperature.

Source: Real Estate Daily Report (realestatedailyreport.net)

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