The needs of the community of Al Khan Al Ahmar in this case were to add two classes to the existing school of Al Kahn Al Ahmar, that had already a demolition order. The chosen technique was the straw bale wall, that was put on an existing concrete base. These thick and heavy structures lays on a sandbags base that protect from humidity and is contained into a wooden structure. A double ventilated roof was used to cut overheating , create an outside open space and hide the building from the street. The advantages of using straw as a building material are different: starting from its great capacity of thermal and acoustic insulation, its low cost, its facility and velocity of use in building walls and roofs covering; till the fact it doesn't need special skilled manpower.