pay

In shipyard work, to pay means to coat timber with a waterproof material, traditionally hot tar or pitch, to protect it from water damage and decay. The term comes from the Old French peier, meaning to cover or seal. On wooden vessels, this was essential work: paying the hull below the waterline prevented seawater from penetrating the wood grain, where it would cause rot and weaken the structure. The same technique applied to seams (the gaps between planks), spars (masts and yards), and any timber exposed to weather or spray.

The materials used varied by era and region, but the principle remained constant. Medieval and early modern shipwrights used mixtures of pitch and tallow (rendered animal fat), sometimes with added rosin or hemp fiber to improve adhesion and durability. The composition had to remain pliable enough to seal without cracking in the movement of the timber, yet hard enough to resist abrasion from water and weather. The coating was applied hot, using rope swabs or stiff brushes to work it into the wood surface and any crevices.

The work itself was dirty and hazardous. The tar or pitch had to be heated in large iron pots, often suspended over open fires or braziers in the shipyard. Burns were common. The fumes were noxious and the material, once hardened on skin or clothing, was difficult to remove. Workers paid the hull seams while the vessel sat in the building berth or in dry dock; it was a specialized, piece-rate job often assigned to dedicated paying gangs rather than general carpenters. On active vessels, paying was part of routine maintenance, done annually or more often on high-wear areas.

Paying versus caulking

Paying and caulking are often confused because both involve sealing seams, but they are distinct operations. Caulking was done first: oakum (tarred rope fibers) or similar material was hammered into the seam between planks using a caulking iron and mallet to make the joint physically tight. Paying followed, coating the external surface with waterproof material to seal it further. A poorly caulked seam could not be fixed by paying alone, so the order and quality of each step mattered greatly.

The term survives in modern maritime vocabulary even though wooden shipbuilding has nearly ceased. Wooden boat builders and restoration specialists still use paying as a technical term, though modern marine sealants and epoxy have replaced hot tar. The practice also lives in idioms and period-specific maritime documentation, where descriptions of paying yards, paying gangs, and paying season appear in naval records and maritime histories spanning from the medieval period to the industrial era.