The ornamental design for a buildingroofcomponent, as shown and described.
FIG. 1 is a top, front and right side perspective view of a building roof component of my new design;
FIG. 2 is a bottom, front and right side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view, the left side view being the mirror image thereof;
FIG. 6 is a top thereof; and,
FIG. 7 is a bottom view thereof.
The building roof component in FIGS. 1-4, 6 and 7 is shown with a symbolic break in its length. The appearance of any portion of the building roof component between the jagged break lines forms no part of the claimed design.