A jangada de tábuas (“planked” jangada) is built over the sand. First the side boards are attached to the transom and bow pieces, creating the outline of the frame. The frame is then suspended fore and aft on boards dug into the sand. The ribs, daggerboard box, and hatch frame are all built in place, making sure the hull stays symmetrical by running a string line down the center. The deck is then planked and the hull flipped over to plank the bottom. The seams of the planks are caulked with cotton and payed with a putty made from lime powder and linseed oil.