Jim Willemin wrote in
7.131:

What is the difference between a floor and a deck? Is the floor in
the cockpit or cabin and the deck 'outside'? I understand the
'floors' in boatbuilding are transverse members in the frames, but
does anyone know the 'proper' usages of floor and deck? Does a
deckhouse have a floor or a deck?

You've basically answered your own question...... the only "floors" are
verticle transverse members.....everything else you are mentioning, is a
deck.