A system and method for waterproofing the interface between a base shoe and a panel is provided. The system includes a weather seal adapted to extend between an inner side wall of the base shoe and an adjacent surface of the panel to seal the gap therebetween. The system includes an elongate groove formed in the inner side wall at a downward offset angle and including a groove entrance that is accessible from directly above. The weather seal includes a foot adapted to be received into the elongate groove when the seal is configured to seal the gap. In this way, the seal may be installed from above and the seal's foot may be pressed into the groove via the groove entrance to secure the seal in place.