ribbon
A painted moulding on the side of a ship.
ribbon: the hull's painted stripe that marks the waterline
A ribbon is a continuous painted stripe running horizontally along a ship's hull, typically marking the sheer line or waterline. It serves both practical and aesthetic purposes: it defines the visual boundaries of the hull, helps crews assess trim and list during construction and operation, and provides a clear reference line for painters and inspectors. On larger vessels, multiple ribbons may be painted at different heights to indicate load lines, draft marks, or structural boundaries.
The ribbon is applied after the hull plating is complete and faired smooth. Paint is laid in a single continuous band, usually 75 to 150 millimeters wide depending on the ship's size and owner preference. The sheer line ribbon, which follows the top edge of the hull plating where it meets the deck, is the most common and visible. Load line ribbons on merchant vessels are statutory markings showing maximum immersion depths for different water densities and seasons; these must comply with international Load Line Convention specifications.
Application and Maintenance
The ribbon must be painted with care to maintain a perfectly fair, level line. Shipyard painters use stringlines and measurements taken from reference points amidships to ensure consistency. The color is typically chosen to contrast with the hull for visibility; dark hulls receive light ribbons, and vice versa. Because the ribbon sits at or near the waterline on working vessels, it endures constant abrasion from water, cargo handling, and mooring. Maintenance repainting is a routine task, especially where the ribbon crosses stress points or shows corrosion underneath.
The term 'ribbon' reflects the moulding tradition in wooden and early steel shipbuilding, when a raised or recessed band was cut into the hull plating itself. Modern practice substitutes paint for raised moulding, but the name persists. In shipyard vocabulary, painting the ribbons is often among the final preparatory steps before launch; crews speak of 'running the ribbon' to describe the painting operation.