Can I use Trimline Ridge Vent on a home with a Cathedral Ceiling?
A. The short answer is yes. It is recommended when using Trimline Ridge Vents on a cathedral ceiling that the area for figuring proper ventilation is the surface area as opposed to the square footage. Make sure the slot is cut continuously along the entire roofline, leaving 6″ uncut at each end. A ceiling vapor retarder is recommended in conjunction with ventilation for cathedral ceilings. With today’s ever increasing amounts of insulation and “tighter” construction, a ceiling vapor retarder may not be so necessary for attics when adequate ventilation is provided. It’s omission would allow vapor to travel more easily through the ceiling and out through the attic vents. It is important, however, to seal or avoid penetrations for electrical ceiling fixtures, which can allow mass movement of moist air into the roof cavity or attic space.
