What is the R-value of a Radiant Barrier?Ī radiant barrier itself is considered to have a R-value of zero.
The waterproof kraft paper covering of this radiant barrier "insulation" product faces down into the attic space - a design later research showed was not the best performer.ĭead air trapped between the double layers of foil above the kraft paper provided a slight increase in the R-value of this product. Our radiant barrier photos just above show the installation instructions printed on the kraft paper facing of ALFOL, an aluminum foil radiant barrier "insulation blanket" product sold and installed in many homes in the 1940's.
RADIANT BARRIER INSTALL
Where to Install a Radiant Heat Barrier, & Which Way to Face the Foil? Or perhaps 160 degF (on a white roof surface) heat is conducted through the roof materials to the roof sheathing where it radiates heat to the area below.Īlso see radiant barrier details for cathedral ceilings discussedĪt CATHEDRAL CEILING VENTILATION.
This article explains the science of radiant barriers (summer heat travels through attics primarily as radiant energy, so when the sun heats up the roof to 190 degF (black roof) They work as if by magic, but the magic is based soundly on principles of physics." "Radiant barriers are highly cost-effective in hot climates because they sharply reduce cooling loads. Sketch at page top and the text are reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss. Radiant Barriers as Energy Saver in Attics or Building Walls We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We explain where a radiant barrier should be located, which way to face the foil, and we describe the circumstances in which radiant barrier "insulation" can be effective. This article discusses the effectiveness and installation options of foil based radiant barriers as building energy savers. Radiant barriers and reflective foil insulation in buildings: We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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