Mono-pitched roof, ventilation gap open in the "tall wall"

[jkemikal]

Hi, the next question regarding my construction project, I've meticulously read through the forum and googled but haven't quite found the right answer.

I'm building a shed roof, and now I'm preparing for ventilation by fastening battens and hardboard under the sheathing on the rafters on the roof. I know how to make the "ending" of the hardboard against the facade on the side where the roof slopes down, but how should I do it on the higher side of the roof? Should there be a ventilation gap there as well? But isn't the point of the ventilation gap that any water that gets "into the roof" can run down and out through the ventilation gap, does it need to be "open" on the top side as well? Or should I seal that side with wind barrier and facade all the way up to the sheathing?

Thanks
/ Janne
https://www.byggahus.se/forum/grund-...isolering.html

 

[PerOF]

Hello jkemikal! The function of the air gap is theoretically to ventilate away moisture. Probably indoor moisture that makes its way up to the roof according to the cloche principle. Older roofs with cold attics have no air gap. If you are going to have roofs with air gaps and which are modern standard, you need an air gap on both sides of the roof to create airflow through the construction. A shed roof might possibly be comparable to a gable roof with ridge ventilation. In that case, ridge vents at the top might be sufficient, but someone more knowledgeable should be able to confirm that. Best regards, PerOF