Condolences to all bereaved families. You said it all. The other problems is lack of standardisation in the building material manufacturing industry. e..g the diameter of steal rods don't meet standard. 2mm is being sold as 8mm, 10mm as 12.5 mm etc. Besides the strength requires re examination. Sand for building should be a sharp sand void of silt. Qualified Building technicians are at home because the clients will call a mason, carpenter, a steel builders who have no scientific knowledge in building science and T structural arrangements. This are the challenges confronting the Housing industry.