The total height for shower surfaces with horizontal waste fitting is measured from the finished floor level to the lower edge of the siphon. It includes the integrated slope and the material thickness. If a lower height is required, waste fittings with horizontal waste may need to be installed in a floor recess. The total height for shower surfaces with vertical waste fitting is measured from the finished floor level to the unfinished floor level. The figures are based on the minimum settings of ESR and FR 5300.