Span Options Calculator for Joists & Rafters
[http://www.awc.org/calculators/span/reversecalc/reversecalc.asp?feet=13&inches=0&species=Douglas+Fir-Larch&member=Floor+Joist&deflectionlimit=L%2F360&spacing=16&liveload=40&snowload=-1&deadload=10&wet=No&incised=No&submit=Calculate+Span+Options] - - public:tojac