Determine the nominal and adjusted design values for a $2$x$10$ @ $16$ o$.$c$.$ timber member SPF No$.1/$No$.2.$ This member is a roof rafter spanning $10-0.$ Bending and shear loads will be about the strong axis of the cross section. Bracing will be provided by a $(1)/(2)$ thick plywood sheathing nailed to the rafters. There is no blocking in between rafters. Buckling is not a concern. Consider dry service conditions and normal temperatures. The controlling load combination would be $1\mathrm{.}2$D$+1\mathrm{.}6($Lr or S or R$)+($L or $0\mathrm{.}5$W$)$ for LRFD and D$+0\mathrm{.}75$L$+0\mathrm{.}75(0\mathrm{.}6$W$)+0\mathrm{.}75($Lr or S or R$)$ for ASD.

What would be the Load Duration Factor?