This paper deals with the linear static and buckling analysis of an asymmetric and orthotropic stiffened 3-layered square sandwich plate. Three different analytical formulas (Model 1, 2 and 3) have been taken from Ref. [1], slightly modified to account for unequal faces and different Poisson’s ratios and applied to a square sandwich plate of fixed dimensions but different face layer thickness. The obtained deflections and buckling loads are compared with the results of a 3D analysis [2] and of Finite Element calculations. Objectives are to evaluate the limits of validity of the formulas in view of thick face layers and orthotropic properties. The properties of the two considered specimen are listed in Tables 1 and 2. The obtained results might serve as benchmark for further studies.