Спасибо.

PS. Мой вариант пока floor для перекрытия и floor deck для пола, но я еще не гуглил толком.

Лу Рид, вики с вами не согласна
http://en.wikipedia.org/wiki/Flooring

Как ни странно, нет. Кмк, для вашего случая можно взять floor structure(s) для перекрытий и flooring для пола как покрытия

The first floor is supported by the foundation. The second floor in a two story home rests on the first floor walls and other supporting structures (headers and beams).
As in almost every part of the house, there are a variety of options in exactly which type of floor construction is to be constructed. Factors affecting these choices may include type of foundation system, anticipated floor loads, availability of materials, common framing practices in your neck of the woods, preferences of your framer and/or house designer, and so forth.
Parts of a wood floor include supporting members (sills and beams), floor joists, fasteners and connections, and flooring.
http://www.home-building-answers.com/floor-construction.html

Supporting Members
The distinction between "beams," and "sills," and "girders" is a little muddeled and is probably subject to local custom. So don't get caught up in the confusion. Just role the punches, and be prepared to use the terms interchangeably.

In any case, this is the big stuff that carries the weight of the floor (and whatever it may support) to the foundation members - walls, piers, etc. The supporting members may be wood or metal or some combination of the two. Sizing is determined by the load to be carried, the type of beam, and the span.

Всем большое спасибо за участие! Заказчик разрешил конкретизировать и использовать floor slab