Using the AWC SpanCalc app $($or the web$-$based version$)$: A Select Structural Hem$-$Fir $28$ floor joist

system with joists at $16in.$ on center is adequately connected to the floor sheathing with nailing.

Assume DL $=10$ psf$,LL=40$ psf$,$ total deflection is limited to

a$.$ Determine the maximum span length for the given conditions.

b$.$ What is the corresponding required bearing length for the determined maximum span?

c$.$ Discuss how the maximum span length and required bearing length change for a lower

deflection limit of $\frac{L}{180}.$

d$.$ Discuss how parts a$)$ and b$)$ change for a weaker wood, say No$.2$ Eastern White Pine?