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Short- and Long-term Performance of Fibre-Reinforced Cement Proffi ififi le Sheets Containing Asbestos and Non-asbestos Materials 90 The Journal of the Royal Institute of Thailand Vol. 37 No. 4 Oct-Dec 2012 Figure 6 Mean breaking loads per metre width for all types of tiles Figure 7 Impermeability results of blue tiles: a) severe dampness on the underface of the sheet and b) failure of coating