The questions keep coming... 
The air gap against the outer roof is basically completed now, but we have some thoughts on how to solve the ventilation at the ridge.
We will have it open up to the ridge.
The insulation will be cellulose, and instead of plastic sheeting on the inside, it will be diffusion-open windproof paper.
The roof consists of, from the outside: clay tiles, battens and counter battens, tar paper, 3mm board, wood shingles, battens.
A carpenter I've been bouncing some ideas with claims that the battens the wood shingles rest on, which lie on the rafters, create a sufficient air gap to carry away any moisture laterally towards the chimney "where there are always openings."
Similarly, we are considering how to allow air into the soffit. It currently consists of unplaned planks that are relatively tight, but you can still see gaps in some places. Should I drill ventilation holes? How large?
What does the forum think?
The air gap against the outer roof is basically completed now, but we have some thoughts on how to solve the ventilation at the ridge.
We will have it open up to the ridge.
The insulation will be cellulose, and instead of plastic sheeting on the inside, it will be diffusion-open windproof paper.
The roof consists of, from the outside: clay tiles, battens and counter battens, tar paper, 3mm board, wood shingles, battens.
A carpenter I've been bouncing some ideas with claims that the battens the wood shingles rest on, which lie on the rafters, create a sufficient air gap to carry away any moisture laterally towards the chimney "where there are always openings."
Similarly, we are considering how to allow air into the soffit. It currently consists of unplaned planks that are relatively tight, but you can still see gaps in some places. Should I drill ventilation holes? How large?
What does the forum think?