Show minimum underfloor ventilation of 1 square foot per 150 square feet of floor area with cross-ventilation.
Show the type, size, and spacing of girders and floor joists. If manufactured joists are used, show the joist series and live-load deflection used. Note that floor joists must be spaced no further apart than 16" o.c. when the underside forms part of a fire separation, such as between a garage and a living space above.
Show the thickness and span rating of the floor sheathing (for example: 3/4 inch, 20/40 plywood).
Provide additional support under concentrated loads such as brick hearths, rock work, wood stoves, gas stoves, and so forth.