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Controlling ice damming by keeping the roof cold.
Vented attic vs unvented attic. In colder climates the main purpose of a vented roof is to keep the roof cold and reduce the formation of ice dams. Which is best for your home. A secondary goal is to vent moisture that infiltrates the attic from the conditioned home. To finish an unvented cathedral ceiling insulated with closed cell foam most codes require a layer of 1 2 inch drywall or an equivalent thermal barrier top.
Sealed attic vs vented attic. Control of ice dams moisture accumulation and heat gain can be successfully addressed by both vented and unvented attic or roof design. The choice of the venting approach is up to the designer. Deciding to upgrade your attic insulation to include spray foam insulation like icynene is a step toward energy efficiency and a more comfortable home.
May 11 2015 2 26pm. However the designs need to be climate sensitive. Removing moisture from roof cavities structural members sheathing and insulation. Enhancing roofing material life span by reducing sheathing temperature.
Unvented attics when insulating an unvented roof assembly prefers closed cell to open cell foam because it s both an air barrier and a vapor retarder. Attics vented vs. Choosing a conditioned attic vs unconditioned attic space comes down to what you want to do with the area and what works best with the design of your home. Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing.
There are traditionally four main reasons for venting a roof. Unvented roofs which provides a detailed explanation of each. A vent space clearance of at least 1 must be maintained at the location of the vent and between insulation and roof sheathing. Unvented roofs vented roof.
If you want the extra storage and don t want to take the risk of moisture buildup the unvented system is the best fit for your home. Vented roofs serve a number of different purposes and their roles vary from climate to climate. Section r806 4 unvented attic assemblies. This section outlines the conditions for unvented attic roof assemblies.
Note that this would not apply where an unvented roof assembly is used as indicated in section r806 4.
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