Here we have another 2 layer project on barn board, this a different roof than normally that we came across. It being a older home had 2 separate attics. Because of this we added ridge venting for the upper portion of the roof, aswell as an edge vent for the middle portion. Ventilation is key in roofing and no enclosed space should be closed off! Shingles used here were CertainTeed Driftwood.