Conditioned Attic Space

In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces. Traditionally building codes have required attic ventilation. This system can help you avoid condensation in the attic.

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A fundamental requirement of an unvented attic assembly is the use of air impermeable insulation on the underside of the unvented roof to prevent air infiltration and exclude airborne moisture from the attic.

Conditioned attic space.

The intended purpose was to allow warm air and moisture to escape. Building america research has demonstrated unvented conditioned attics can substantially improve energy performance while allowing home builders to continue locating hvac systems in the attic space. A design decision to have a central ducted heating and cooling system with ducts and air handler located in the attic is another good reason to insulate and air seal at the roof line which will provide a conditioned or semi conditioned space for the hvac equipment. The attic space becomes indirectly conditioned as a result of the air leakage heat transfer and vapor diffusion through the ceiling.

If the home has any mechanicals in the attic like hvac or duct work the unvented attic system will keep it protected. The loss of energy efficiency means some designers choose to move the ductwork into the conditioned areas of the home and leave the attics unvented. You can convert it to a living space or storage area. Making the attic a conditioned space means the space will be the same temperature as the rest of your home.

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