The framing of floors may be most conveniently drawn on tracing cloth or thin bond paper laid over the corresponding floor plan. The framing plan should show the interior supports or partitions in the story below and the framing around all openings, chimneys, etc. Provision should also be made for the support of all partitions that do not come over one below (see Sections 65 and 66) and for nailing the ends of the floor boards where they come against walls or partitions. Any necessary framing for hot air pipes and floor registers and the position of the same should be shown, and also the location of the bridging.
The size and position of all special timbers, including the beams that support partitions and all headers and trimmers, should be accurately figured, and also the size and position of all openings. In short, the framing plans should afford all information necessary for erecting the frame of the building without consulting the other plans.
If there is any special construction or peculiarity of framing required it should be indicated by three-quarter or inch scale details on the margin.
Fig. 35 shows the framing of a part of the second floor of a wooden dwelling laid out in the above manner. For large buildings the framing plans may be drawn to a scale of 1/8 inch to the foot and the common joists indicated by a single line. All special timbers should be colored yellow on the drawings to make them more prominent.