From Icynene.com:
An unvented attic is a space between the ceiling joists of the top story and the roof rafters where an air impermeable insulation is applied directly to the underside of the structural roof deck and is tied into the insulation located in the walls, such that the roof system becomes part of the insulated building enclosure. This attic space becomes indirectly conditioned space as a result of air leakage, heat transfer and vapor diffusion through the uninsulated attic floor. There are no supply or return vents from the HVAC system located in the unvented attic space.
This design practice benefits situations where space limitations require HVAC equipment and duct work to be located in the attic. In this situation, modifying the attic to create a conditioned attic space has generated significant reductions in energy consumption. This paper reviews unvented attic construction, briefly discusses its history and reviews the benefits in terms of energy efficiency in hot humid climates and cold climates. Sections on cathedral ceilings, condensation control and historic buildings are also included.
Check out Icynene’s Air-Seal Demo here.
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