hm, but there is no vapor barrier in the picture. So what exactly is supposed to be airtight in the construction? Do I have to insist on a vapor barrier now or is it okay as described in the link?? I am confused.
Since the manufacturer specifically offers this solution, it must be assumed that this roof construction is and remains free of defects. Since convection is not hindered from the room side in this way, it still causes me to frown. According to the "pure doctrine," convection in the roof construction should be prevented.
The manufacturer offers a contact option on their website; it is best to call a technician from the company and explain your project, as they can best explain how their product is applied without defects.
I wrote them an email once. But I see it the same way: I have slight reservations about the construction. I will then post the result here. Many thanks for your help!
The question that arises is why the roofer does not simply use a better above-roof insulation? For example, there is neodach.de, a system with Styropur, which can be laid on intact battens, and the roof tiles are then placed on top of that. This way, only the airtightness in the roof area and at the verge edges needs to be considered. I have had good experiences with it myself, having installed such a roof 8 years ago, and everything still fits perfectly today.