In Portugal, in last 3 decades, damage in masonry partition walls associated with the vertical deflection of concrete slabs has been frequently reported in buildings in serviceability conditions, resulting in high repair costs and use additional materials for repairing, therefore impairing economical and environment sustainability of buildings during their life cycle. Masonry partitions are fragile elements that can be easily damaged when affected by the structural deflections, therefore, reinforcement solutions may be required to improve strength and deformation capability of new or existing masonry partitions. This study evaluated masonry partitions with reinforced coating with glass fiber mesh, as a potential solution to mitigate this type of damage. The evaluation was based on a FEM simulations of concrete slabs loading partition walls, which included a constitutive damage model for the masonry walls and a shear-cohesion model to simulate concrete/walls interface joints, which were calibrated through experimental results obtained from lab tests performed in small scale walls. The main objective was to obtain more suitable deflection limits for slabs supporting the most common type of partitions used in Portugal, including the use of reinforced coatings and detachment joints. According to the results obtained, a high risk of damage was identified in this type of masonry partitions when affected by the long-term structural deflection limits referred in technical literature, and the use of reinforced coating and wall/structure detachment joints can reduce this risk.