Moisture / Mold Attic

Hello,
we have discovered that our attic is damp and light mold has formed on the wood.
Our house was plastered in December, and the screed was installed at the beginning of January.
We have an uninsulated roof; the insulation will be laid on the concrete ceiling.
So far, only the insulation on the very outside has been laid because the roof is so flat that you can't reach it otherwise. The rest of the insulation is still packed up in the attic.
The hatch to the attic has not yet been installed.
So all the moisture has risen upwards and settled on the inside of the roof structure and the foil.
Now the foil is damp in some places, and light mold has formed on the wood.
The insulation lying at the edge is also partially damp.
What would you do now?
Is it enough to remove the mold (if yes, how) and then let everything dry?
Does the damp insulation need to be replaced?
What about the attic hatch now? If we install it now, the moisture will be trapped above. But if we leave it open, the moisture will continue to rise upwards.
And how do I ventilate best to get the moisture out? The heating is not finished yet but should be working by midweek at the latest.
It would be great if someone had tips for us.
In hindsight, it was obviously very stupid to leave the hatch open at the top. However, unfortunately, due to personal problems (illness, surgery, etc.), things have been a bit chaotic over the past few weeks...

I can only tell you how to get rid of mold: Make a solution of Danklorix and water, about 1 to 5. And paint the affected wood with it. Or do it with a plant sprayer. Boom, it's gone.

Why does the moisture from the attic no longer go away? Aren't there any ventilation strips or something like that?

What would you do now?

1. Address the cause, 2. Renovate. (This may sound trivial, but structure always helps ...).

Does the damp insulation have to be replaced?

If in doubt, yes, first consult the manufacturer (read the datasheet first, then call technical support).

What about the roof hatch now? If we install it now, the moisture will be trapped above. But if we leave it open, the moisture will continue to rise upwards.

Close the roof hatch (close the path for new moisture), then ventilate/dry the roof by removing some tiles crosswise (consider the weather). This is a rough guess without knowledge of the on-site situation.

Furthermore: Are you building alone or with an architect under separate contracts, or is there even a general contractor? Depending on that, further advice could be derived.

Thanks in advance! We are building by ourselves. The architect was only responsible up to the execution plans. Our site manager (a good friend of ours) was suddenly out for a few weeks...

: Do you mean by combating the cause to get rid of the moisture? And by renovating, to remove the mold?

We will definitely close the hatch first and try to get everything dry in the attic. But it also seems to be considerably drier now that we are allowed to ventilate the construction (which was not possible before because of the screed). We have the foil under the roof, which allows moisture to escape from the inside but not from the outside (I don’t remember the name right now).

And would you only treat the wood that currently shows mold with a mold remover, or as a precaution treat all the wood? It is mainly in the area above the hatch, and only in a few spots there.

Thanks already! We are building on our own. The architect was only responsible up to the execution plans. Our construction manager (a good friend of ours) was out unexpectedly for a few weeks...

: Do you mean by combating the cause, getting rid of the moisture? And by renovating, removing the mold?

We will definitely close the hatch first and try to get everything dry in the attic. However, it already seems a lot drier now that we are allowed to ventilate the construction (that wasn’t possible before because of the screed). We have the foil under the roof that lets moisture pass from the inside but not from the outside (unfortunately, I don’t remember what it’s called right now).

And would you only treat the wood with a mold remover where mold is currently visible, or precautionarily treat all the wood? It is mainly in the area above the hatch, and only in a few spots there.

Why should it not be possible to ventilate with the screed, exactly there is where you have to ventilate?

And you don’t have a construction manager, otherwise this definitely wouldn’t have happened.