The research project aims to investigate the reliability of earth masonry exposed to bending pressure, taking into account the influence of moisture. Within the project period, a user-friendly safety concept is to be developed which, in addition to conventional material scattering, also takes into account the influence of varying component moisture. To this end, experimental investigations will first be carried out on different earth building materials with the aim of determining the climate dependency of strength and deformation properties relevant to the design. On this basis, engineering models can then be developed for the analytical calculation of the climate-influenced load-bearing capacity of earth masonry. Furthermore, realistic extreme value distributions of the component moisture in typical earth masonry constructions are developed with the aid of hygrothermal simulations. For this purpose, parameter studies are carried out which include various transient boundary conditions, such as different internal climates, varying wall structures and changing external climates in the calculation. Based on the knowledge gained about the climate-dependent load-bearing capacity and the statistical distribution of the water content within an earthen masonry wall, the reliability of earthen building components subjected to bending pressure can be analysed in detail. As a result of the comprehensive reliability-theoretical investigation, the aim is to be able to design earth masonry on the basis of a semi-probabilistic safety concept in the future. The material-side partial safety factor to be determined as part of the project will serve as a practical proposal, which will enable the use of earth masonry in compliance with the standardised reliability index.