For products covered by standard EN 1304 ‘Clay roofing tiles and fittings — Product definitions and specifications’ and intended for external use, a new classification in relation to their essential characteristic ‘frost resistance’ is established as follows:
Class 1 (150 cycles): minimum 150 cycles. If after 150 cycles none of the tiles shows any of the damage described as unacceptable according to EN 539-2:2013, Table 1.
Class 2 (90 cycles): 90 – 149 cycles. If after 90 cycles none of the tiles shows any of the damage described as unacceptable according to EN 539-2:2013, Table 1.
Class 3 (30 cycles): 30 – 89 cycles. If after 30 cycles none of the tiles shows any of the damage described as unacceptable according to EN 539-2:2013, Table 1.