CGL Maximum Thatched Roof Maximum Inside of GCL 33.6°C 20 th July PM14:13 Thatched roof 28 th July 32°C Surface of GCL 47.6°C 20th July PM13:13 Insulation steel roof 28 th July 37°C Steel roof 63.5°C 20 th July PM13:33 Steel roof 28 th July 50°C Air temperature 38.3°C 20th July PM13:53 Air temperature 28 th July 33°C