The effect of friction in panel tests with steel support is not investigated here, and, to our knowledge,not investigated elsewhere either. Coefficient of friction values in the literature ([10], [15]-[17])indicate that there is no reason to believe that the effect of friction with steel support should be anyless than shown in this report for wooden support. Using a bedding material on top of the supportfixture (as described in EN 14488-5 for steel support) probably also has an effect, but to which extentis uncertain.