Dutch to English Tech/Engineering Ships, Sailing, Maritime binnenvaart

An object fell from a crane and went through the "buiting" and the "vlak".
I know that "vlak" is another name for the ship's bottom, but buiting is still a puzzler, particularly as in the past I found that buiting = (fr) pavois or (en)bulwark
In this context, however, it seems that the buiting refers to the floor of the hold of a barge. In a ship this would be the "tank top", but as a barge does not have double bottom tanks this cannot be used.
Has anybody come across this term before?
Thx in advance