Use D$.$Fir$-$L Select Structural Grade to design oblique sawn timber purlins

${}_{\text{F}\text{i}\text{l}\text{e}\text{P}\text{r}\text{e}\text{v}\text{i}\text{e}\text{w}}^{\text{t}\text{h}\text{e}}$ e following conditions:

Purlin spacing $=1\mathrm{.}5m$

Purlin span $=5\mathrm{.}7m$

Roof pitch $=\frac{1}{4}$

Specified dead load $=0\mathrm{.}65$kPa

Specified snow load $=3\mathrm{.}2$kPa

Standard duration of load

Dry service condition

No Treatment.

$[$Assume any other data that may be required.$]$