2. Set the sill slope in the slot at the desired location. Using the pre-drilled holes in the sill slope as a guide, drill through both walls of the sill slope and into the optional pre-panning and substrate. See Figure 6
NOTE: Temporarily place shims between the sill slope and the interior edge of the slot to maintain a 1/8" gap and help to mark the location of the slope once you remove it from the slot.