Monopanel roof sandwich panel with PIR core (40 to 150 mm) and trapezoidal S320GD steel facings, lengths up to 15.3 m, to roof or re-roof cattle barns, pig houses, poultry houses and storage sheds while limiting condensation and temperature swings. B-s2,d0 fire reaction, Broof (t3) rating, compatible with photovoltaic panels, optional smooth polyester inner facing for aggressive atmospheres and high-pressure washing.