To the timber Guru in the net

I am building a deck on my house and this is new to me, so I don’t know the spacing between the bearers and joists, (I assume the size of the members are part of this too)? How is this calculated?

The other part of this problem was the shape, it’s a wedge(ish) shape, and will this change the design? Or the supports? I have some old plans of house that have decks and I used these to draw up my plans but they are all square shape.

Attached is a snap shot, one part of the plan view & the other the footings. (the deck is between 1 to 0.7m high)

Bearers size @ ? distance
Joists size @ ? distance

Regards Joel
:confused: