Attic ventilation is what makes a sealed roof work
A sealed deck without a designed intake and exhaust path cooks shingles and the attic. Ventilation is part of the roof, not a later accessory.
The shop stack is not on this page. The consultation is where the existing vents are named.
Book
Inspection & Assessment. Card at booking. Default price $200. The only discount code is FYPM.
Longer explanation: /docs/ventilation