How Do You Vent Rigid Insulation In The Roof?
Heat from the inside of a home can rise up and get trapped between the interior ceiling and the exterior roof. If the home isn’t properly ventilated, allowing the hot air a place to escape, the heat can melt snow under the eaves and cause leaks. Homes with cathedral roofs especially have this problem, because there is very little attic space. The heat inside the home has nowhere to go but up. In extremely cold areas, contractors will use a rigid foam insulation to keep the extreme weather conditions away from the roof. But the insulation must also have proper ventilation. After adding the rigid insulation, create an airspace to increase the over-all ventilation of the roof. The process slows down the loss of indoor heat and decreases the chances of ice buildup. Take off the existing roof. Install a 2-by-4 perimeter nailer all the way around the roof’s edge. Cover the entire area with 4′-by-8′ sheets of 1 1/2-inch-thick rigid foam insulation. Secure them to the sheathing using cap nails
