The practice of attaching extra strips of wood to the outside of a ship's frames before planking, or adding a second layer of planking over the original hull. Shipwrights historically used this technique to widen a vessel that was built too narrow, increasing its beam to improve stability and buoyancy. It can also refer to shims used to fair an uneven frame so the hull planks lie smooth.
Heard on the job
The frames were out of alignment by an inch, so we added some furring to fair the curve before laying the garboard.