ᐅ Insulating the Attic

Hello home builders and renovators 🙂

I also found this house building forum because I currently need some advice and would be happy to offer help where I can.

To get straight to the point:
Our house has been standing for 6 years now, and it’s time to properly finish the attic, which will be used as storage space for boxes, suitcases, etc.
Our construction company, which eventually went bankrupt, in my opinion did not do a good job and poorly insulated the attic. You can see this in the partially finished attic. As a layperson, it seems to me that the vapor barrier behind the drywall in the ceiling area was installed carelessly. Unfortunately, it is not 100% airtight because some overlaps have come loose. The insulation was installed between the roof rafters, and some of it has already fallen out. Now my question about our attic project:

Can it be left as it is, or do I need to change anything about the roof insulation?
Would it make sense to install another vapor barrier in front of the existing insulation?
I remember that the vapor barrier is supposed to go directly in front of the insulation.

I have closed off about one fifth of the attic with OSB sheets to make the chimney sweep’s window exit reasonably safe, and partly to store suitcases, boxes, and tiles.

My goal in the near future is to make the attic fully accessible for more storage space and to properly insulate and cover the roof or the floor.

I appreciate any helpful information so that in 5–10 years I won’t have moldy insulation or have to start over.

Thanks and best regards from the beautiful Pfalz!
Dennis

P.S.: Pictures attached!

Your project is prone to errors.

I would consult a professional. A damaged vapor barrier is not something to take lightly.