Marley Eternit quality P6 Roof sheet, When correctly installed, Profile 6 has been tested and classified as non-fragile, this must be considered when working to the roof safety requirements of HSG 33. Profile 6 is a high strength fibre cement sheet with polypropylene reinforcement strips inserted along precisely engineered locations which run for the full length of the sheet in each corrugation. This provides maximum reinforcement strength with no loss of durability in service. 2900mm long