In [1, 2] the results of wall models on a full scale were presented, and the zone around the window opening was analyzed. In [3] the research technique andmain tests results of the second stage tests carried out on the same research models, i.e. analysis of the perpendicular zone connection zone were described. This article presents an analysis of the obtained tests results, describes the damage ofmodels and provides guidelines for the usage of reinforcement in the connection zone of perpendicular walls. It was found that the reinforcement in the connection zone of perpendicular walls should be usedwhen the difference in deformation at the wall will be greater than 0.0003. However, if these deformations exceed the value of 0.0008, then dilatation should be used or a connection made of an element capable of taking over such a strains difference.

Keywords: AAC masonry; compression tests; connection of perpendicular walls; tests on a full scale.