How to build low-lying deck over concrete and lawn?

[SMUCKY]

Hi all - new here & hoping to maybe have some questions answered regarding some upcoming work im planning at my place!

We have a small backyard that is half concrete/half grass, we are wanting to make the 47m2 space more useable so am planning on decking over the whole thing essentially with a roof covering over the top one day too. Due to poor drainage in the existing grass area I will be starting off by making the drainage sufficient, concreting in the posts, & then covering essentially the whole backyard in blue metal then build the deck over the top. Due to the small height I have (70mm) ontop of the slab I will be using ClickDeck's extra low profile system to make the job possible. Then due to the small clearance in the grass area I have, the deck will be a single-level deck design & I will be leaving the finished height of the ground below much lower than it is currently as to avoid moisture issues under the deck.

My question is, judging by my rough plans I drew up. Am I in the right direction? Do I have too much framing as it does seems like a lot. Although I have based most of my measurements off of others advice but wondering if its overkill.

Essentially plan on concreting in posts, notching out posts to sit joists on & running a joist only system with hangers in place due to my overall clearance.

I'm aware of council requirements on decks & will have to alter the design to suit.

I'll include photo of what the backyard looks like now as well as my plans.

Thanks in advance!

Blake

[Nailbag]

Hi @SMUCKY nothing wrong with being a perfectionist. Welcome to the club 🤝

Nailbag

[Nailbag]

Once you have completed the sub-frame, I highly recommend laying over the joist strips of Protectadeck to extend the life of the decking boards and joists.

Nailbag