A series of 14-ft-long Douglas fir (S4S) joists carry a floor live load of 40 psf and a superimposed dead load of 20 psf. In addition, there is a concentrated load from a partition running perpendicular to the joists 5 ft from one end.
The partition load is 250 lb/ft. The joists are spaced 16 in. on center. Select the required size for the joists.