After the hull structural members are in place for the deck, the planking may be layed. In this illustration, the planking is held in place with clamps while it is bolted into place. The deck planking is then caulked and the seams payed with tar, so that the deck is watertight.
This image is from Basil Greenhill and Sam Manning, The Evolution of the Wooden Ship, 1988, p. 152. Used by permission of the artist, Sam Manning.