Monopanel double-sided steel roof sheet, 1000 mm cover width, lengths up to 13 m, designed for the aggressive atmospheres of livestock buildings and grain and fodder storage: RC4 corrosion resistance, RUV3 UV resistance and ammonia resistance. A1 fire reaction, non-slip surface for safer installation, warranty of up to 20 years including under photovoltaic panels; an alternative to fibre cement.