WOODEN floors consist of boards supported by timbers. The timbers of floors of upper rooms frequently have to carry a ceiling for the room below, which has therefore to be considered in the construction of the floor.
Naked Flooring is the term applied to the timbers of the floor without the boards.
There are three classes of floors, viz.
Single floors. Double „ Framed „ In all these floors the boards rest immediately upon pieces of timber called "bridging joists" or "common joists"
N.B. In the sketches illustrating the subject of Floors (Figs. 272 to 308) the parts are marked with the distinctive letters given below.
Fillets for sound boards
Wall plates .