A bottom trim member attaches a curved sheet to a surface. The bottom trim member includes a connecting part having a sheet receiving component that is configured to receive a bottom portion of the curved sheet, and a connecting leg extending in a downward direction relative to the curved sheet. A seal and cover member is attachable between the connecting leg and the surface and surrounding the connecting leg. With this construction, the seal and cover member serves to provide a moisture seal between the bottom trim member and the surface on which the trim member is mounted and serves to cover an area through which a fastening member can be placed to fix the trim member to the surface.