Cracking of prefab sandwich panels impact s not only the appearance of buildings aesthetically but has also consequences for the material durability, as well as the thermal and acoustic performance of the building envelope as a whole. The project investigates the possible causes of cracks from the design to the production stage, transport and final application and exposure. The study w ill focus on material related causes due to the different types of restrained shrinkage, considering also mitigation measures by shrinkage reducing/compensating admixtures, to design related factors and to environmental factors during transport and the service life of the elements. The actual study will focus on the drying shrinkage as well as shrinkage mitigating possibilities. Restraining and environmental factors wil l be investigated experimentally and by FEA. The results of the project will be evaluated and concluded in a list of recommendations for mitigating cracking in sandwich elements