Energy is considered one of the biggest challenges facing the world economy due to the lack of conventional energy sources of crude oil and natural gas used in energy generation. The use of thermal and sound insulation materials in a buildings construction is one of the ways to reduce energy consumption. Therefore, this study addresses the importance of using thermal insulation materials in building envelopes to reduce energy loss as a result of heating and cooling conditions, with a reduction of sound transition for a more comfortable living environment. The heat transfer through conduction was calculated for the building, with and without thermal insulation, by using three common insulation materials: Rock wool, Extended Polystyrene, and Polyurethane. The selection of these materials depends on availability in the market, cost of implementation, and the coefficient of thermal conductivity. The results showed that the Rock wool thermal insulating efficiency is almost the same as the other two materials, which reduces the heat transfer by 74.63% on the exterior walls, 32.53% on the ground floor, and 64.97% in the roof, it cost 3,876,689 IQD and reduce the electricity bill by saving 681,914 IQD per year with a payback period of 5.69 years, it also reduces CO2 emission by 64.7% and increases noise reduction of the exterior walls from 59dB to 70dB.
Keywords: Thermal and Sound Insulating Materials, Thermal conductivity, Thermal diffusivity, Sound intensity absorbed, Bulding insulation.