How wide is the 12 ft. SM-Rib Galvanized Steel 29-Gauge Roof Panel?

Each 12 ft. SM-Rib Galvanized Steel 29-Gauge Roof Panel covers a 3 foot wide section.

When installed, each 12 ft. SM-Rib Galvanized Steel 29-Gauge Roof Panel covers a 3 foot wide section. Before installation, the panels are a little bit wider than that, because the last rib of each panel overlaps the next panel.