By Paul Scelsi, Air Vent, published in Roofing Contractor Magazine, April 2021.
Among the many reasons to give residential attics a properly balanced ventilation system of intake vents (in the soffit or low on the roof) and exhaust vents (at or near the roof peak), is the impact it can have on the life of a shingle....We polled roofing contractors and asked: “In your local field experience, what percentage of shingle life reduction do you see due to incorrect or zero attic ventilation?” The results: 24% shingle service life reduction.
