Ventilation gap in insulated porch roof adjacent to building

[Johnny_]

A deck extension with a new roof that is to be insulated.
It is glazed but the glass panels do not meet, instead they overlap with a 1 cm air gap. Thus, it is well ventilated and not heated.



From top to bottom.
At the top: bitumen waterproofing mono-pc (completely sealed).
Raw wood
Beams
Next to the beams is a 25mm batten that forms an air gap.
120 mm wood fiber insulation from Nativo Hunton
70 mm wood fiber insulation from Nativo Hunton
Waxed wood paneling on the underside.

To facilitate ventilation, I have drilled about 10-12 holes per section (between the beams) each 12 mm in diameter under the gutter in the image utifrån.jpg (you can see the holes in the gap if you look closely at the far end, there are more holes now since the picture was taken.


However, there are two beams next to each other at the edge of the construction, so it is 90 mm thickness before the air reaches the air gap.
There is no soffit ventilation except for the 12 mm holes I have drilled through the two beams.
The problem I have is how the air should circulate and whether it needs to circulate in this space?

Here is my reasoning:
The insulation has the ability to buffer moisture, there is no plastic or membrane, so it can dry downwards. The space below is well ventilated, and the sun quickly heats the roof surface in sunshine; therefore, no ventilation is needed according to this reasoning.

But in cold weather conditions and potential snow on the roof and humid air, there could be leakage from below of moist air up into the construction, which could condense on the battens and hang there as water droplets, eventually becoming a problem.
To counteract this, you want to be able to have the space ventilated, but this could also mean that the wind can carry the moist air into the space and cause it to condense even more on colder parts...

In any case, I thought that one could drill holes between the beams and thus connect the different sections and let them exit behind the wind board to the right in the image utifrån.jpg


The wind blows under the gutter and through channels to behind the wind board if this is a good solution, see image ventilations_ide.jpg

Alternatively, I could just keep the holes under the gutter, but then the air will not move at all.
As it is now, I have already started building the ceiling and reached about 1.8 meters of it, with no holes between the sections.

I thought to solve the challenge of air always taking the path of least resistance by increasing the diameter of the holes between the sections; the further in, the larger the hole, with the largest hole at 22-25 mm at the farthest end and about 10 mm in the middle.

P.S There are built-in spotlights in pots at 8 locations in the construction that generate a little heat when they are on. This could only contribute positively as I see it.

What do the experts at Byggahus say?

 

[Stefan1972]

I'm sure it works even if it's not about any huge flows of air. It still moves, and I assume you're not planning to settle out there or build a spa with a shower.