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Going to be using C24 47mm x 100mm joists attached to 100mm x 100mm posts via m12 coach bolts.
Will be using 400mm centre gaps between joists, 34mm x 145mm boards on the joists.
It'll sit no more than 100-200mm off the ground.
I plan to run the posts about 1200mm apart as it fits in with the size etc but not I'm not sure if you run the posts:-
a) 1200mm apart down every 400mm centres so every joist is attached to a post
b) 1200mm in each direction so across every 3rd joist.
For a deck 2.4m square (not what I have just an example)
Option a) would be 21 posts
Option b) would be 9 posts
Option a just sounds like over kill but I do like to over engineer things
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