You wrap it in cardboard as shown in the picture. Whether it is good or not I don't know, but I would say the most common approach is to build a box out of plywood with a metal lid for the purpose and a regular insulated pipe.
Don't quite understand what you're referring to, but usually, the box goes through the roof (see the pictures), so you have to remove the roofing felt and boards to get it through.
Of course, you can also just place it on top, and then you only need to tear so you can get through what you need to get through.
I think that the instruction that comes with it isn't quite applicable for flat cardboard roofs. It feels a bit strange that I have to cover with metal when the rest of the roof is just cardboard, for example.
I am not very knowledgeable about vents or imkanaler and their regulations, but from a waterproofing perspective, I see no advantage with the one you linked, it's not the box that should be insulated but the channel/pipe that needs it.
A roofer/pappläggare can certainly help but will likely not want to handle the actual vent. job.
Gummistos works well for uninsulated pipes like venting for sewage but has nothing to do here in my opinion.
Don't think there should be any pipe in the box itself.
The pipe connects at the bottom.
But of course, if I get the drilling perfect, maybe I can manage with a rigid spiro. It would just feel much better to be able to use a flexible pipe if the drilling is off by a few cm. Those rigid pipes can't flex 1 mm.
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