The most effective way to prevent hot attics and high energy bills is to enclose the attic space and use spray foam insulation against the roof deck. This technique is referred to as a conditioned attic because it allows the space to be heated and cooled like the rest of the home, reducing thermal performance problems that plague conventional vented attics.
One major benefit of a conditioned attic is the ability to place HVAC system air handlers and ductwork directly in the thermal envelope. Historically, these systems were located in vented attics. Research conducted as part of the Building America program and carried out by builders across the country has helped to influence code acceptance of unvented, conditioned attics since 2006.
Creating a Conditioned Attic Space: Turning Storage Into Living Area
HVAC systems located in the thermal envelope are more closely aligned with the indoor temperature of the living spaces. This helps to eliminate cold drafts in the winter and excessive heat gain in the summer. It also reduces duct leakage, which is common in vented attics.
Lastly, unvented attics are fire safer in wildfire zones. Ash and embers typically enter vented attics through the vents, but not in an attic that has been insulated and sealed with fiberglass and mineral wool.
In addition, a conditioned attic is easier to inspect and repair roof leaks because the attic surface no longer allows for air infiltration. It also keeps out outdoor contaminants, including dust, pollen, ragweed, dander and outdoor pollution.
Georgia Insulation Atlanta
Atlanta, GA 30349
(470) 764-7083