FWIW, the way roofs are designed these days (at least over here in Belgium) there is supposed to be a little bit of airflow underneath your roof, which is achie

FWIW, the way roofs are designed these days (at least over here in Belgium) there is supposed to be a little bit of airflow underneath your roof, which is achieved by letting the ridge and hip tiles hover over the roof (instead of cementing them like they used to do) and putting a perforated grate at the bottom just above the gutters instead of boarding it up.