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tsunami emergency temporary relief United Nations disaster strong quick low cost housing construction system supplier walls wall walling brick bricks block cement clc cellular lightweight alternative hurricane black economic empowerment own business job creation South Africa awards savings concrete schemes houses structures buildings building formwork shutter method carcaça custo baixo cubierta bajo costo low cost affordable sustainable development emergency disaster school projects tenders prefab shelter plastic homes news books home classroom clinics earthquake proof resistant technology plans new journal contractor builder design engineer architect prefabricated prefab database cast pour production fast track modular training patented best ties link rod pressure army barracks Afghanistan Sri Lanka Indonesia India South America Mexico architect Africa war poor form steel wood decking props adobe straw bale factory export patent high rise double storey project cheap reinforced steel aid monolithic low cost housing