Object of research: oriented particle boards (OSB) plate under the action of vertical load. As a research tool used standard FE-model of the OSB-plate is used. The functioning of the OSB-plate as an element of the pitched roof structure with a soft tile is considered. In this case, the load on the surface from the snow and the weight of the soft roof has a tangential component distributed over the outer surface of the plate. However the influence of the tangential load on the plate has not been fully studied in well-known literature. The tangential component of the load can cause unevenness in the end joins of the OSB in pitched roofs. The purpose of this study is to identify the causes of unevenness (irregularity) in joints of OSB in structures of inclined roofs and vertical walls, also justify recommendations for addressing these causes. It is obvious that the cost of resources for the implementation of this intention will be justified if the OSB-plates have the prospect of effective use in the construction, including environmental management. For this reason, a brief overview of the OSB evolution is one of the tasks of the presented work. Other actual tasks: modeling the influence of the tangential component of load evenly distributed on one and two surfaces of the OSB-plate, the longitudinal side faces of which were clamped. In each of these two cases of loading, the OSB board can be inclined or vertical. It is shown that the tangential load causes an increase in deflections in the region of one of the end faces of the plate and a decrease in deflections opposite to the edge. This can lead to unevenness at the joints of OSB-plates. In order to exclude the revealed cause of the appearance of unevenness in constructions with OSB, it is suggested that the flexural rigidity of the plates in the area of their ends by stiffeners or carbon fiber strips should be increased.