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This paper reviews local and bio-sourced materials for construction through their thermomechanical characteristics, but with an emphasis on their thermal conductivity that allows us to assess the thermal performance (insulation) of these materials. Then, we discuss the energy problems in Mauritania, while highlighting the local and bio-sourced materials existing in this country. These materials could be an alternative to solve these energy problems. Finally, we focus on the thermal performance of Typha Australis, a plant that grows abundantly in fresh water mainly in Senegal and Mauritania, which would have good advantages over the thermal performance of the building.