Northern Climate Roof Venting

That answers the energy question.

Northern climate roof venting.

The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck. Unventing attics in cold climates saves. Unventing roof assemblies in most cold climates decreases the heating load by about 10. The roof design included an interstial space of 1 5 to 2 meters between the ceiling and roof deck.

The building codes and building science for natural roof ventilation however only appeared in the 1940s. In coastal climates wind driven rain can be blown in through these openings with similar results. In cold climates this is an advantage. The ceilings were typically constructed of plaster with little or no insulation.

Our field measurements and computer modeling show that without attic venting the temperature of the underside of the roof sheathing increases by 10 f 20 f. In a cold climate the primary purpose of ventilation is to maintain a cold roof temperature to avoid ice dams created by melting snow and to vent any moisture that moves from the conditioned living space to the attic. The option you choose will be contingent on factors such as the type of roof you re working with and the local climate. The roofing was typically asphalt or coal tar built up roofing applied directly to the roof deck.

Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams. Warming up to unvented roofs the underside of the roof sheathing is where the real benefits of not venting roof assemblies are found. Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals. This comprehensive collection of articles and videos on roof venting will help you throughout every step of the process whether you re still weighing the options or are beginning installation.