Products to be applied shall be stacked on a level surface without pallets being placed on top of each other until the installation process is complete. They shall be covered with a waterproof material that provides adequate ventilation. The contractor shall ensure that materials stored on site are protected from various damages and harmful substances (dust, dirt, chemicals, etc.). If damage or defects are observed in materials stored without complying with the above provisions, the contractor shall replace them with new ones at no additional cost to the employer and manufacturer. Before the flooring installation, the existing concrete surface shall be cleaned of dust, dirt, chemicals, etc. During the application process and for 48 hours after application, the ambient temperature shall not fall below +5º C.