Size and grade
The selection of a floor joist size and stress grade depends on:
- the span of the floor joist
- the spacing of the floor joist.
The required wind classification for the intended site of the building must be known.
The roof load width (RLW) is similar to the floor load width (FLW), however, how much of the roof load is distributed to the floor joists must be determined. So, the type of roof covering must also be known.
