Energy-saving EI45 POLAR loft ladder with double-sealed 86 mm thick hatch, thanks to which the heat transfer coefficient of the hatch amounts to 0.46 W/m2*K, guaranteeing low heat loss and energy cost savings. The applied fire-proof sealing guarantees fire resistance at the EI45 level. To increase safety, the EI45 POLAR loft ladder is equipped with a handrail facilitating entry and with non-slip feet. Ud - coefficient of the hatch centre.