ᐅ Install a vapor retarder with an Sd value of 100 or a climate membrane film?

Hello everyone,
I’m currently working on a new build and have nearly finished my roof. The insulation consists of 60mm (2.4 inches) wood fiber boards on the rafters and 240mm (9.4 inches) insulation between the rafters.

I chose a PE foil with an Sd value of 100 and have already installed it. However, after reading more about it, I’m having some doubts about the foil. Can someone help clarify this for me, or should I remove it and install a vapor control membrane instead? That would be a huge amount of extra work now.

Thanks for your answers.

A climate membrane can somewhat conceal mistakes, but it is not essential. It is far more important that everything is properly sealed, both between the layers and at the wall connections.

And what is the exact structure of all layers, including the Sd-values?

Thank you for the responses.
Here is the structure of my roof.
The materials are wood fiberboard on the rafters and fiberglass insulation between the rafters. As a vapor retarder, as mentioned, there is a PE foil with an SD value of 100.

So, no underlayment? What is the vapor diffusion resistance factor (SD value) of the soft fiberboard?

No underlay membrane. I cannot say what the Sd value of the wood fiber boards is.