The Adhesion between stonewall and polymers is crucial for the estimation of the overall compressive and shear strength of the masonry after repair interventions. The existing methods to estimate the adhesion realistically are either the experimental evaluation or the fracture mechanics Approach. The Adhesive fracture can be handled in the same way as the cohesive one leading to the use of related mechanical properties of the materials. Stress analysis data and fracture mechanics approach are available, to compare the data which can be obtained experimentally. In this work two different shear adhesive joints were tested. The results of the experimental work are in good agreement with those calculated by using the fracture mechanics approach.