26 Aug '16, 12pm

High Humidity in Unvented Conditioned Attics

High Humidity in Unvented Conditioned Attics

When vented unconditioned attics are converted to unvented conditioned attics by spraying open-cell spray polyurethane foam on the underside of the roof sheathing, the attics often become more humid. Although building scientists are now debating the mechanisms responsible for high humidity in these attics, most designers and builders are more interested in discovering ways to prevent the problem or solve the problem than they are in understanding the problem's underlying causes. While open-cell spray foam seems relatively inexpensive, its use on the underside of roof sheathing may require a protective layer of 1/2-inch drywall, an interior vapor retarder, and special HVAC runs to condition the air in the attic. Builders should consider these costs before specifying open-cell spray foam. One possible solution to the humid-attic problem is to install a forced-air supply regi...

Full article: http://www.greenbuildingadvisor.com/articles/dept/musings...

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