Adhesive mortar for gluing Styrofoam boards within the insulating system of outdoor walls SEMPRE TERM ST with light wet method. Provided in form of a dry powder mix, ready to use after mixing with water. To be used for new buildings, as well as ones subject to thermo-modernization. The boards glued with a mortar require additional fastening with mechanical connectors, i.e. expanding pins from plastics. Also available in version TESOROMONT START TU-100 IGLOO to be used in winter time or in low temperatures.