Span calculator for wood joists and rafters also available for the android os.
Floor joist dimensional lumber span chart.
Also available for the android os.
Looks like half the allowable beam span is suggested in the chart.
This table is for residential construction only and is meant only for the purposes of initial estimation.
Clayton f 8 10 2017 11 31 11 pm reply.
Douglas t 2 12 2017 9 58 35 pm reply.
Wood species spacing o c ss grade 1 grade 2 grade 3 grade.
Data taken from cmhc wood frame house construction tables notes.
Cam s 6 25 2017 10 41 46 pm reply.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.