06-13-2011, 02:16 AM
The radiant barrier will give you the most bang for the buck, however, you should install it closer to the roofing. If you place it on the underside of the rafters or even between the rafters (allowing at least 3/4" between the barrier and roofing) it will keep the attic air cooler thereby keeping the room below cooler. The other advantage to this method is that the barrier will not become dirty or corroded nearly as fast. If the barrier above the drywall is laid flat, any dust in the attic will settle on it, decreasing it's effectiveness significantly.
What color are the exterior walls to the house and do they get direct sunlight at all? If they do, adding radiant barrier to those walls will also help. If they are just bare studs, place it on the interior edges of the studs and cover with drywall, or between the studs.
What color are the exterior walls to the house and do they get direct sunlight at all? If they do, adding radiant barrier to those walls will also help. If they are just bare studs, place it on the interior edges of the studs and cover with drywall, or between the studs.