Home > How To > Roofing > Vented vs. Unvented Roofs: The Great Debate Roofing Vented vs. Unvented Roofs: The Great Debate "Unvented roofs are possible in theory, but venting is always the safest course, especially in cathedral ceilings" By Ted Cushman Login or Register to download the PDF version of this article. (322.69 kB)