Building Insulation Materials - Reflective Insulation and Radiant Barriers

Reflective Insulation and Radiant Barriers

Reflective insulation and radiant barriers reduce the radiation of heat to or from the surface of a material. Radiant barriers will reflect radiant energy. A radiant barrier by itself will not affect heat conducted through the material by direct contact or heat transferred by moist air rising or covection. For this reason, trying to associate R-values with radiant barriers is difficult and inappropriate. The R-value test measures heat transfer through the material, not to or from its surface. There is no standard test designed to measure the reflection of radiated heat energy alone. Radiated heat is a significant means of heat transfer; the sun's heat arrives by radiating through space and not by conduction or convection. At night the absence of heat (i.e. cold) is the exact same phenomenon, with the heat radiating described mathematically as the linear opposite. Radiant barriers prevent radiant heat transfer equally in both directions. However, heat flow to and from surfaces also occurs via convection, which in some geometries is different in different directions.

Reflective aluminum foil is the most common material used as a radiant barrier. It has no significant mass to absorb and retain heat. It also has very low emittance values "E-values" (typically 0.03 compared to 0.90 for most bulk insulation) which significantly reduces heat transfer by radiation.

Read more about this topic:  Building Insulation Materials

Other articles related to "insulation, reflective insulation and radiant barriers":

Spray Foams (insulation) - Benefits
... Spray foam insulation saves on energy costs and lowers utility bills ... Buildings treated with spray foam insulation typically insulate as much as 50% better than traditional insulation products ... Insulation that is sprayed in buildings protects against moisture, which provides the benefit of reducing the chance of harmful mold and mildew ...
Super-insulation Systems
... Super-insulation systems can refer to Superinsulation, for houses Multi-layer insulation, for spacecraft ...
Building Insulation Materials - Reflective Insulation and Radiant Barriers - Disadvantages
... Must be combined with other types of insulation in very cold climates May result in an electrical safety hazard where the foil comes into contact with faulty ...
Spray Foams (insulation) - Environmental Properties
... Insulation of all types stop a good deal of energy loss ... Insulation can also save energy in hot climates by reducing airconditioning use ... Spray foam insulation levels vary, with some providing up to an R-value of 6.7 per inch ...
Insulation
... Insulation means Building insulation, added to buildings for comfort and energy efficiency Soundproofing, also known as acoustic insulation, any means of reducing the intensity of sound Thermal ...

Famous quotes containing the words barriers, radiant and/or reflective:

    The majority of women, they have half-a-glass too much and let down their barriers a little. Then they wake up in the morning, riddled with guilt and think they can reclaim their virtue by saying, “I don’t remember.”
    Blake Edwards (b. 1922)

    she in the kitchen
    aproned young and lovely wanting my baby
    and so happy about me she burns the roast beef
    and comes crying to me and I get up from my big papa chair
    saying Christmas teeth! Radiant brains! Apple deaf!
    Gregory Corso (b. 1930)

    Be reflective ... and stay away from the theater as much as you can. Stay out of the theatrical world, out of its petty interests, its inbreeding tendencies, its stifling atmosphere, its corroding influence. Once become “theatricalized,” and you are lost, my friend; you are lost.
    Minnie Maddern Fiske (1865–1932)