Ventilating today’s cathedral ceilings is more of a challenge than ventilating regular roofs. Because of the isolated air spaces in rafter cavities, cathedral ceilings are especially prone to moisture damage - posing unique ventilation problems.

Metal roofs have topped barns, buildings and country homes in the United States since the 1700s. But today's metal roof is nothing like the familiar standing-seam tin roof of years ago. Thanks to modern technology, metal roofs are available in all colors and shades, and many styles are virtually indistinguishable from traditional asphalt shingles, cedar or slate.