Building inner wall with ventilation

[claym]

curious if it could be vävtak

Ahh ok. I can remove a small strip of the ceiling where the beam is going to go and check

 

[claym]

Here's the answer. Roofing felt/roofing fabric?

 

[henke_benke]

Here we have the answer. Roof felt/roof fabric?

now you know why the roof is soft.
it's called a woven roof. Then the construction can vary.

 

[claym]

A quick question if someone has the opportunity.
I'm about to start installing OSB and drywall now. I will, of course, stagger the seams between these and have a couple of mm gaps between the OSB boards.
But what's best to start with?
1. A whole 1200 OSB board from the corner, which means that the drywall board is cut in half
Or
2. A cut 600 OSB from the corner, which means the drywall board is 1200

When I look around, it seems that people advocate for option 1

 

[Rabbithole]

Yes option 1. The gypsum is beveled at the edges for putty. Then it will be good to break it in the middle and take one half on each side of the corner.

 

[claym]

Great thanks!!!