Description: You are required to assess the insulation effectiveness of a building located in a cold climate. The building has a at roof with a total surface area of 200 square meters. The roof is insulated with a material that has a thermal conductivity {k} of 0.025 Wftm-K}. The temperature inside the building is maintained at 25C. while the outside temperature drops to -5C during winter. Questions: 1. Determine the U-value of the roof insulation. {4 marks) 2. Using the calculated U-value and the temperature difference between the inside and outside, estimate the rate of heat loss through the roof in watts {W}. {2 marks)