Because radiant barriers keep attics cooler, the space is more usable for storage. For instance, uninsulated, unconditioned spaces such as garages, porches, and workrooms can be more comfortable with radiant barriers. You may also find that radiant barriers can expand the use of space in your home. An attic radiant barrier stops almost all of this downward heat transfer so that you can stay comfortable without air conditioning during mild weather. Yet solar energy still heats up your roof, insulation, attic air, and ceiling to temperatures that can make you uncomfortably warm. During these milder seasons, outdoor air temperatures are comfortable much of the time. In the warm spring and fall, radiant barriers may save even more energy and cooling dollars by increasing your personal comfort. In summer, when your roof gets very hot, a radiant barrier cuts air-conditioning costs by blocking a sizable portion of the downward heat gain into the building. This heat transfer makes your air conditioner run longer and consume more electricity.Īn aluminum foil radiant barrier blocks 95 percent of the heat radiated down by the roof so it can't reach the insulation. The insulation absorbs the heat and gradually transfers it to the material it touches, principally, the ceiling. Without a radiant barrier, your roof radiates solar-generated heat to the insulation below it. In hot climates, benefits of attic radiant barriers include both dollar savings and increased comfort. Other types of radiant barriers, “chips” and multi-layer products, are acceptable for location 3 (more below).īack to Table of Contents What are the benefits of radiant barriers in attics? Only locations 1 and 2 are recommended for sheet radiant barriers because dust will accumulate on the radiant barrier if it is installed at location 3. Figure 1 illustrates the locations in which a radiant barrier may be installed in an attic. When will I see a payback from an attic radiant barrier?Ĭonclusions Selected References What is a radiant barrier?Ī radiant barrier is a layer of aluminum placed in an airspace to block radiant heat transfer between a heat-radiating surface (such as a hot roof) and a heat-absorbing surface (such as conventional attic insulation).What else can I do to decrease heat gain through my attic?.What's the easiest installation method in new construction?.
What kinds of radiant barrier materials are available?.How do radiant barriers "block" heat transfer?.What are the benefits of radiant barriers in attics?.Also included are recommended ways to install radiant barriers in existing attics and new homes. Herein are answers to some of the most commonly asked questions.
To most homeowners, attic radiant barriers are a new energy conservation concept many of them have questions about how radiant barriers work and how to use them. Third, many decking manufacturers are producing roof decking products with a radiant barrier preinstalled, saving money on installation costs in new housing and redecking applications.
Second, manufacturers are improving the quality of radiant barrier materials. First, tests by the Florida Solar Energy Center (FSEC) and other groups show that they work. They are increasing in popularity for three two reasons.
Beal ) IntroductionĪttic radiant barriers made of aluminum foil are becoming a popular way for homeowners to save energy and money in Southern states. In this article are solely those of the authors andĪre not intended to represent the views and opinions of the Disclaimer: The views and opinions expressed