Concrete base should be dry (not more than 4% residual moisture), chemically eutral, even (not more than 5 mm on the base of 2 meters), endurable (compressive resistance of concrete base is not less than 15 MPa, for columns - not less than 10 MPa, tensile strength - not less than 1.5 MPa); should not have starved spots, cement milk, defects and cracks. The base fragments with insufficient strength as well as areas contaminated with oils should be removed mechanically. The base temperature should be between +5 °C and +35 °C. It is recommended to apply the material with a trowel.