a$)$ Select an appropriate decking thickness assuming SPF and is $127mm$ wide

b$)$ Choose deck joist spacing using joist selection tables in WDM for the above sketch, assuming the following:

Clear span for the joists of ${13}^{\text{'}}{0}^{\text{'}\text{'}}$

Deck is attached to a part $4$ building.

$210$ joists, spf #$2,$ pressure treated but not incized.

Assume cantilever is small enough to be ignored.

Snow for strength $=2$kpa

Snow for serviceability $=1\mathrm{.}8$kPa

Load duration is "standard"

Service condition "dry"

Assume decking laid as single span

Use select grade