I will also create a ventilated air gap in the wall by drilling holes in the sill, angled downwards out through the outer panel. I will put copper mesh or mounting tape over the holes that will be in the outer panel to prevent mice from getting in there. I'll cut down the current wind barrier and then screw 22 mm boards in the angle between the wall stud and the outer panel, and then staple the wind membrane on the inside of the boards so a 22 mm ventilated air gap is achieved. I believe it might be good to get ventilation to the wall.