Floor Joist Size Chart. This table is for a dead load of more than 025 but not more than 050 and allows for an imposed loading of no more than 15 kNsqm. LPI 52PLUS LPI 56.
1 in 254 mm. The minimum bearing length is 1 ½ spans values in bold indicate that web stiffeners are required at the OSB end panel. The floor joist spacing is the distance between the centers of any two installed joists.
2012 version of the Span Calculator for Wood Joists and Rafters.
If a room is 10 inside to inside and the joists are cut 10 7 so they will bear fully on both walls then the span will be 10. 9-12 11-78 14 16. Flange widths vary from 1-12 to 3-12. Looking at this table you will see there is a choice in the size of floor joist 2 X 6 2 X 8 2 X 10 or 2 X 12 and there is a choice in the joist spacing 12 16 or 14.
