The heat loss through the roof in the winter typical week varies in the 3 scenarios. The heat loss in scenarios 1 and 3 are nearly the same with the mean value of −2.63 GJ. When the part of the roof was covered with green vegetation (original green building),the heat loss through the roof (−2.55 GJ) is slightly lower than the buildings in scenarios 1 and 3. When the entire roof was covered with green vegetation (in scenario 2), the heat loss through the roof decreased to −2.09 GJ, which is more than 20% lower than scenarios 1 and 3.