Breakthrough roof insulation for photovoltaic cables

Hello,

we have decided on a photovoltaic system for our roof as an overlay system; it was recently installed.

Now I am wondering how the hole created by the photovoltaic cables in the roof should be sealed again or what is professionally correct. It has a diameter of about 3 cm, since the electrician for the final work has not come yet, I would like to know a bit more in advance than now (nothing ;) )

The structure of the roof (house built according to the Energy Saving Ordinance Standard 2016 and according to the airtightness test very tight, value 0.59):

-Concrete tiles on battens with batten ventilation
-breathable underlay membrane (Siga Majcoat 150 SOB)
-mineral wool (0.35) as insulation between rafters
-vapor barrier
-gypsum board ceiling

The cable/opening in the roof runs next to a sanitary vent on the roof.

A worker said it would be sealed again with silicone or sealant.

How is the opening in the underlay membrane and the vapor barrier professionally sealed again?

Definitely not with silicone!

There are cuffs for that and the suitable tape from siga & co

Thanks already for the concrete hint regarding the vapor barrier, I will insist on that.

How about the underlay membrane? Are there similar products for that? Or is a small hole there not quite so dramatic?

The cuffs can be applied to all kinds of films/underlayment membranes. You just have to order/apply the appropriate one for each product.

Right in the first picture, you can also see that it can even be applied to OSB. (With the suitable adhesive tape)

Holes in films are always more or less dramatic. Because they limit or render the function/purpose of the film absurd.

So, the person was here and stuck a cuff onto the drywall, not onto the vapor barrier, because he couldn't reach it there. He claims that this is okay now, as it is airtight. I suspect not, right?