What is the Header size of board for a 9 ft. wide garage door?

The header size for a 9-foot wide garage door typically requires a minimum of a double 2x6 or a double 2x8 beam, depending on the local building codes and the structure's load requirements. This header size ensures adequate support for the door and any loads above it. It's essential to consult local building regulations or a structural engineer for specific requirements in your area.