Currently replacing deck boards and currently at the Deck ledger. need some advice for bringing it up to standard

[evident]

Currently replacing my 30 year old deck boards with some composite. It's mostly a free floating deck with the exception of a walkout from my back door that's about 5 feet wide and is attached to my home via a ledger board.
I pulled the boards off yesterday and this is what i found. There's a small piece of metal flashing tucked behind the vinyl siding. Behind that seems to be some kind of stick on adhesive.
I noticed as i pulled off the deck boards that there were a decent amount of tiny ants on the right side of the ledger board. Sprayed some raid to get rid of them all.

I've been trying to find something online to show me what I can do to bring this to modern standards but I just want to check here as well. It seems like i should get some kind of self adhering membrane, tuck it up behind the vinyl siding and have it overlap the ledger board, and then put a piece of L or Z shaped metal flashing on top of that (replacing my existing metal one). Anything else i'm missing?
[Imgur](

https://imgur.com/RVejfh3

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[Imgur](

https://imgur.com/CaVNG1C

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[Greenman]

What am I seeing below the door? It looks like dead ivy or brush. Whatever it is should be item one on the agenda.

 

[herm0016]

looks like wrinkled up peal and stick to me.
and your ledger has flashing. and good size bolts to the house.

actually looks better than most of the new stuff around here.

 

[Greenman]

looks like wrinkled up peal and stick to me.
and your ledger has flashing. and good size bolts to the house.

actually looks better than most of the new stuff around here.

By golly you're right, it is vicore or something like it.
The ledger flashing should be a Z and not an L.

 

[evident]

What am I seeing below the door? It looks like dead ivy or brush. Whatever it is should be item one on the agenda.

Directly below the door was a wood trim that I ripped off. What there is black peel and stick with glue remainder on it.

 

[evident]

i cleaned it up a little, put some zip tape on the copper flashing and put everything back together.