The higher the emissivity, the greater the emitted radiation at that wavelength. Emissivity is expressed as a number between zero and one at a given wavelength. The amount of energy radiated depends on the surface temperature and a property called emissivity (also called "emittance"). Reflective tape can be adhered to strips of radiant barrier to make it a contiguous vapor barrier or, alternatively, radiant barrier can be perforated for vapor transmittance.Īll materials in existence give off, or emit, energy by thermal radiation as a result of their temperature. One sided radiant barrier may be attached to insulating materials, such as polyisocyanurate, rigid foam, bubble insulation, or oriented strand board (OSB). The radiant barrier may be one or two sided. The foil may be coated for resistance to the elements or for abrasion resistance. In building applications, this surface is typically a very thin, mirror-like aluminum foil. Because thermal energy is also transferred by conduction and convection, in addition to radiation, radiant barriers are often supplemented with thermal insulation that slows down heat transfer by conduction or convection.Ī radiant barrier reflects heat radiation (radiant heat), preventing transfer from one side of the barrier to another due to a reflective, low emittance surface. Radiant barrier is a shiny, reflective building material used to reflect heat radiation.Ī radiant barrier is a type of building material that reflects thermal radiation and reduces heat transfer.
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