Low level deck with slab

[smokocw]

I recently had a patio installed and want to complete the feature with a 5.4mx3.8m deck.

There is an existing 3.3mx3.3m  ~100mm thick slab as shown which is about 1/2 of the deck area to be built over.

Clearance from the slab to proposed deck floor level is 100mm (at the door) to the internal floor tile level

For the remainder of the area is a clay "soil"

My questions here are can I build a deck on top of the existing slab with only 100mm clearance?

Is there a minimum size for joist requirements ?

Will I need to dig out the non slab area to a certain depth ?

The Deck will extend out to the gutter on the sliding door side beyond the existing slab

[Itai]

Thanks for the tips and notes @pete_brig 

[trentp]

G’day mate, 

Did you end up digging out the grassed area around the concrete? Got anymore pics?

[MitchellMc]

Hi @trentp.

Let me mention @smokocw so they are alerted to your question and to see if they might be able to assist with additional pictures or information.

Mitchell