Posts for raised decking, timber or plastic?

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Hello,
I’m designing a 6m by 2.4m deck which will be fixed via a ledger board to my house along the 6m length. The other 6m side will be supported by a beam which will be fixed to posts.

What posts are best? I definitely don’t want to put timber in the ground.

I’m thinking

1. Plastic posts - but these only come 100mm square and I don’t see much evidence of anyone using them.
2. Timber posts 100mm but can’t see any where these are recommend for a deck raised above 600mm
3. Timber posts 140mm as recommended in “TDCA Code of Practice Raised Timber Deck Structures on New Homes”, which is a great guide!

The timber posts above to be fixed to a steel bracket with a concrete footing formed from some kid of tube (as in Quickcrete style in the USA).

For the 100mm posts I don’t see any specs for spacing where as for the 140mm posts the TDCA guide has good info.

Any thoughts?

Thanks
 
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