Airflow air gap.

[thomasonit]

Planning an extension with a parallel roof. The problem is that the roof ends against the wall of the existing house. How do you ensure good air circulation in the air gap? The roof consists of Felt, board, air gap (45), wind protection, insulation, battens, gypsum.

 

[thomasonit]

Here is my own suggested solution. Please comment if it is an approved solution.

 

[Matti_75]

You do exactly as you have drawn. Make the wall upstand at least 300mm.

 

[thomasonit]

Ok, thanks, then I was on the right track.