... isdifficult to apply them in particular cases in the absence of test results forthe materials being used. 4. 4 .4 Section 4: design of masonry (a) General stabilityInitial provisions of this section call ... determination of the value of the characteristic compressive strength of the masonry (fk) and the thickness of the unit required to support the design loads. Once fk is calculated, suitable types of masonry/ mortarcombinations ... middle fifth of the wall Φm can be determined from Fig. 4. 6using values of hef/tef and emk/t. Figure 4. 6, used in EC6, is equivalentto Fig. 4. 4, used in BS 5628, to obtain values of Φ and...